The introduction of wireless capsule endoscopy has brought a revolutionary change in the diagnostic procedures for gastrointestinal disorders.Biopsy,an essential procedure for disease diagnosis,has been integrated int...The introduction of wireless capsule endoscopy has brought a revolutionary change in the diagnostic procedures for gastrointestinal disorders.Biopsy,an essential procedure for disease diagnosis,has been integrated into robotic capsule endoscopy to augment diagnostic capabilities.In this study,we propose a magnetically driven biopsy robot based on a Kresling origami.Considering the bistable properties of Krelsing origami and the elasticity of the creases,a foldable structure of the robot with constant force characteristics is designed.The folding motion of the structure is used to deploy the needle into the target tissue.The robot is capable of performing rolling motion under the control of an external magnetic drive system,and a fine needle biopsy technique is used to collect deep tissue samples.We also conduct in vitro rolling experiments and sampling experiments on apple tissues and pork tissues,which verify the performance of the robot.展开更多
With the rapid development of holographic technology,metasurface-based holographic communication schemes have demonstrated immense potential for electromagnetic(EM)multifunctionality.However,traditional passive metasu...With the rapid development of holographic technology,metasurface-based holographic communication schemes have demonstrated immense potential for electromagnetic(EM)multifunctionality.However,traditional passive metasurfaces are severely limited by their lack of reconfigurability,hindering the realization of versatile holographic applications.Origami,an art form that mechanically induces spatial deformations,serves as a platform for multifunctional devices and has garnered significant attention in optics,physics,and materials science.The Miura-ori folding paradigm,characterized by its continuous reconfigurability in folded states,remains unexplored in the context of holographic imaging.Herein,we integrate the principles of Rosenfeld with L-and D-metal chiral enantiomers on a Miura-ori surface to tailor the aperture distribution.Leveraging the continuously tunable nature of the Miura-ori's folded states,the chiral response of the metallic structures varies across different folding configurations,enabling distinct EM holographic imaging functionalities.In the planar state,holographic encryption is achieved.Under specific folding conditions and driven by spin circularly polarized(CP)waves at a particular frequency,multiplexed holographic images can be reconstructed on designated focal planes with CP selectivity.Notably,the fabricated origami metasurface exhibits a large negative Poisson ratio,facilitating portability and deployment and offering novel avenues for spin-selective systems,camouflage,and information encryption.展开更多
The unique arrangement of panels and folds in origami structures provides distinct mechanical properties,such as the ability to achieve multiple stable states,reconfigure shapes,and adjust performance.However,combinin...The unique arrangement of panels and folds in origami structures provides distinct mechanical properties,such as the ability to achieve multiple stable states,reconfigure shapes,and adjust performance.However,combining movement and control functions into a simple yet efficient origami-based system remains a challenge.This study introduces a practical and efficient bistable origami mechanism,realized through lightweight and tailored designs in two bio-inspired applications.The mechanism is constructed from two thin materials:a PET sheet with precisely cut flexible hinges and a pre-tensioned elastic band.Its mechanical behavior is studied using nonlinear spring models.These components can be rearranged to create new bistable structures,enabling the integration of movement and partial control features.Inspired by natural systems,the mechanism is applied to two examples:a passive origami gripper that can quickly and precisely grasp moving objects in less than 100 ms,and an active magnetic-driven fish tail capable of high-speed swimming in multiple modes,reaching a maximum straight-line speed of 3.35 body lengths per second and a turning speed of 2.3 radians per second.This bistable origami mechanism highlights its potential for flexible design and high performance,offering useful insights for developing origami-based robotic systems.展开更多
This paper presents an untethered pneumatic soft robot which can crawl both in horizontal and vertical pipes with different sizes and cross sections.This robot uses modular origami inspired soft-rigid hybrid actuator ...This paper presents an untethered pneumatic soft robot which can crawl both in horizontal and vertical pipes with different sizes and cross sections.This robot uses modular origami inspired soft-rigid hybrid actuator to produce telescoping and anchoring movements powered by vacuum pressure.The introduction of grooves to valley crease significantly lowers the full contraction vacuum pressure and improves the response,allowing the system can be driven by an onboard micro vacuum pump,enabling the possibility of miniaturization,integration,and untethered operation of the robot.A series of crawling experiments in pipes with different sizes and cross sections constructed by acrylic are conducted to validate the crawling performance of the robot.Within square cross-section pipes,the robot can achieve a velocity of 9.4 mm/s in horizontal crawling and 7.7 mm/s in vertical upward crawling.For horizontal crawling in circular pipes,it can reach a velocity of 8.0 mm/s.When fully charged,the robot can crawl for 40 min with a mileage of 16.649 m,which is sufficient for most drainage and industrial pipelines detection tasks.The robot demonstrates excellent endurance and speed performance that exceed most existing untethered soft pipe crawling robots.展开更多
RNA offers distinct advantages for molecular self-assembly as a unique and programmable biomaterial.Recently,single-stranded RNA(ssRNA)origamis,capable of self-folding into defined nanostructures within a single-stran...RNA offers distinct advantages for molecular self-assembly as a unique and programmable biomaterial.Recently,single-stranded RNA(ssRNA)origamis,capable of self-folding into defined nanostructures within a single-stranded RNA molecule,are considered a promising platform for immune recognition and therapy.Here,we utilize single-stranded rod RNA origami(Rod RNA-OG)as functional nucleic acid to synthesize valence-programmed RNA structures in a one-pot manner.We discover that the polyvalent RNA origamis are resistant to RNase degradation and can be efficiently internalized by macrophages for subsequent innate immune activation,even in the absence of any external protective agents such as lipids or polymers.The valence-programmed RNA origamis thus hold great promise as novel agonists for immunotherapy.展开更多
This paper presents,for the first time,an effective numerical approach based on the isogeometric analysis(IGA)and the six-variable quasi-three dimensional(3D)higher-order shear deformation theory(HSDT)to study the fre...This paper presents,for the first time,an effective numerical approach based on the isogeometric analysis(IGA)and the six-variable quasi-three dimensional(3D)higher-order shear deformation theory(HSDT)to study the free vibration characteristics of functionally-graded(FG)graphene origami(GOri)-enabled auxetic metamaterial(GOEAM)plates submerged in a fluid medium.The plate theory incorporates the thickness stretching and the effects of transverse shear deformation without using any shear correction factors.The velocity potential function and Bernoulli's equation are used to derive the hydrodynamic pressure acting on the plate surface.Both horizontally and vertically immersed plate configurations are considered here in the form of inertia effects.The plates are composed of multilayer GOEAMs,with the GOri content varying through the plate's thickness in a layer-wise manner.This design results in graded auxetic growth.The material properties are evaluated by mixing rules and a genetic programming(GP)-assisted micromechanical model.The governing equations of motion for the FG-GOEAM plates immersed in a fluid medium are derived by Hamilton's principle.After validating the convergence and accuracy of the present model,a comprehensive parametric study is carried out to examine the effects of the GOri content,GOri distribution pattern,GOri folding degree,fluid level,immersed depth,and geometric parameter on the natural frequencies of the FG-GOEAM plates.The results show that the natural frequencies for the four GOri distribution patterns increase with the increase in the layer number when the lay number is fewer than 10,and then stabilize after the layer number reaches 10.Besides,in general,the natural frequency of the FG-GOEAM plate in a vacuum or fluid increases when the GOri content increases,while decreases when the GOri folding degree increases.Some additional findings related to the numerical results are presented in the conclusions.It is believed that the present results are useful for the precise design and optimization of FG-GOEAM plates immersed in a fluid medium.展开更多
Most existing treatments for origami-folding simulations have focused on regular-shaped configurations.This article aims to introduce a general strategy for simulating and analyzing the deformation process of irregula...Most existing treatments for origami-folding simulations have focused on regular-shaped configurations.This article aims to introduce a general strategy for simulating and analyzing the deformation process of irregular shapes by means of computational capabilities nowadays.To better simulate origami deformation with folding orders,the concept of plane follow-up is introduced to achieve automated computer simulation of complex folding patterns,thereby avoiding intersection and penetration between planes.Based on the evaluation criteria such as the lowest storage energy with tightening and the fastest pace from tightening to unfolding,the optimal crease distribution patterns for four irregular(‘N’-,‘T’-,‘O’-,and‘P’-shaped)origami configurations are then presented under five candidates.When the dimensions of the origami are fixed,it is discovered that simpler folding patterns lead to faster deformation of the origami configuration.When the folding complexity is fixed,higher strain energy results in more rapid origami expansion.展开更多
Precise design and control of molecular self-assembly as living creatures are exciting ideas in the field of nanotechnology.Characterized with predesigned geometries and accurate spatial addressability,programmable DN...Precise design and control of molecular self-assembly as living creatures are exciting ideas in the field of nanotechnology.Characterized with predesigned geometries and accurate spatial addressability,programmable DNA origami nanostructures have been recognized as optimized tools for assembling multiple functional components.A variety of biomolecules can be attached to the nanoscale drawing boards in a site-specific fashion,thus facilitating the precise construction of DNA origami-based materials for studies on biological interface.In this minireview,we highlight the recent advances in the precise construction of DNA origami-based materials with artificial bio-structures and/or biomimicking functions.The regulation of biological functions by these DNA origami-engineered assemblies at the bio-interface has been summarized and discussed.展开更多
In this paper,the design,manufacture and testing of an origami protective shield with a supporting frame structure are presented.It consists of an origami shield surface and a deployable supporting frame structure tha...In this paper,the design,manufacture and testing of an origami protective shield with a supporting frame structure are presented.It consists of an origami shield surface and a deployable supporting frame structure that needs to be portable and sufficiently stiff.First,for the design of the shield surface,a threestage origami crease pattern is developed to reduce the shield size in the folded state.The shield surface consists of several stiff modular panels and layered with flexible fabric.The modular panels are made of a multi-layer composite where a ceramic layer is made of small pieces to improve durability as those small pieces enable restriction of crack propagation.Then,the supporting frame structure is designed as a chain-of-bars structure in order to fold into a highly compact state as a bundle of bars and deploy in sequence.Thus,a feature-driven topology structural optimization method preserving component sequence is developed where the inter-dependence of sub-structures is taken into account.A bar with semi-circular ends is used as a basic design feature.The positions of the bar’s end points are treated as design variables and the width of the bars is kept constant.Then,a constraint on the total length of the chain of bars is introduced.Finally,the modular panels made of multi-layer composite and the full-scale prototype of the origami shield are fabricated and tested to verify the bullet-proof performance.展开更多
The multidisciplinary space environment,encompassing orbital debris,cosmic radiation,and solar radiative heat,poses significant risks to spacecraft and astronauts,necessitating efficient and effective shielding soluti...The multidisciplinary space environment,encompassing orbital debris,cosmic radiation,and solar radiative heat,poses significant risks to spacecraft and astronauts,necessitating efficient and effective shielding solutions.A multi-layer shield with wide spacing has been proven to be an effective way to shield the spacecraft from space debris impact;however,due to the limited volume of the payload fairing,it was not feasible to apply a multi-layer shield to the spacecraft fuselage.Through the origami design,the shield maintains a compact form during launch and subsequently expands in outer space to enhance protection.Through geometric analysis,it has been confirmed that the deployable multi-layer space shield can occupy less space than conventional space shield structures while expanding into wider shield intervals and multiple layers.Through hypervelocity impact experiments,it was confirmed that as the bumper spacing of the multi-layer space shield expands,its ballistic performance becomes superior to conventional space structures.The deployable multi-layer space shield can reduce not only hypervelocity impacts but also solar radiative heat using the same mechanism as multi-layer insulation.Through cosmic radiation dose analysis,it has been confirmed that the multi-layer space shield is effective in cosmic radiation shielding compared to conventional space structures.展开更多
The present work investigates higher order stress,strain and deformation analyses of a shear deformable doubly curved shell manufactures by a Copper(Cu)core reinforced with graphene origami auxetic metamaterial subjec...The present work investigates higher order stress,strain and deformation analyses of a shear deformable doubly curved shell manufactures by a Copper(Cu)core reinforced with graphene origami auxetic metamaterial subjected to mechanical and thermal loads.The effective material properties of the graphene origami auxetic reinforced Cu matrix are developed using micromechanical models cooperate both material properties of graphene and Cu in terms of temperature,volume fraction and folding degree.The principle of virtual work is used to derive governing equations with accounting thermal loading.The numerical results are analytically obtained using Navier's technique to investigate impact of significant parameters such as thermal loading,graphene amount,folding degree and directional coordinate on the stress,strain and deformation responses of the structure.The graphene origami materials may be used in aerospace vehicles and structures and defence technology because of their low weight and high stiffness.A verification study is presented for approving the formulation,solution methodology and numerical results.展开更多
Brittleness remains the key bottleneck for graphene to be used as impact protection materials and this obstacle can be overcome by origami-modified graphene.Herein we employed molecular dynamics sim-ulation to investi...Brittleness remains the key bottleneck for graphene to be used as impact protection materials and this obstacle can be overcome by origami-modified graphene.Herein we employed molecular dynamics sim-ulation to investigate the perforation behaviours of graphene origami(GOri)under ballistic impact from a diamond projectile.We found that the threshold penetration velocity of GOri can be improved signifi-cantly by 46.27%compared with that of its pristine counterpart.Under a small ballistic impact loading at a low speed,GOri experiences a unique unfolding process and hence has improved impact-resistance performance.Depending on the initial velocity of the projectile,three different penetration phenomena are observed,i.e.bounce-back,capture,and perforation state.The penetration energy depends on the roughness of GOri,the initial impact velocity,the projectile’s radius and the layer number.This study provides useful insights into the perforation behaviours and energy absorption of GOri and offers useful guidelines for graphene applications as impact protection materials.展开更多
Cellular structures are commonly used to design energy-absorbing structures,and origami structures are becominga prevalent method of cellular structure design.This paper proposes a foldable cellular structure based on...Cellular structures are commonly used to design energy-absorbing structures,and origami structures are becominga prevalent method of cellular structure design.This paper proposes a foldable cellular structure based on theWaterbomb origami pattern.The geometrical configuration of this structure is described.Quasi-static compressiontests of the origami tube cell of this cellular structure are conducted,and load-displacement relationship curvesare obtained.Numerical simulations are carried out to analyze the effects of aspect ratio,folding angle,thicknessand number of layers of origami tubes on initial peak force and specific energy absorption(SEA).Calculationformulas for initial peak force and SEA are obtained by the multiple linear regression method.The degree ofinfluence of each parameter on the mechanical properties of the single-layer tube cell is compared.The resultsshow that the cellular structure exhibits negative stiffness and periodic load-bearing capacity,as well as foldingangle has the most significant effect on the load-bearing and energy-absorbing capacity.By adjusting the designparameters,the stiffness,load-bearing capacity and energy absorption capacity of this cellular structure can beadjusted,which shows the programmable mechanical properties of this cellular structure.The foldability andthe smooth periodic load-bearing capacity give the structure potential for application as an energy-absorbing structure.展开更多
A local design scheme for origami energy dissipation braces was proposed by combining local Miura units at both ends and a straight segment in the middle.This design was implemented to address the issue of uneven axia...A local design scheme for origami energy dissipation braces was proposed by combining local Miura units at both ends and a straight segment in the middle.This design was implemented to address the issue of uneven axial stiffness observed in global origami braces.Globally and locally designed origami braces were simulated and compared under cyclic loading to validate the advantages of the proposed design scheme in terms of hysteretic properties.Additionally,an analysis was conducted on the designed braces with varying straight segment lengths,geometric angles,and origami plate thicknesses for comparison.Results indicate that the local design significantly increases the tensile bearing load,enhances the anti-buckling capability,and improves the energy dissipation performance compared to the global design.The positive impact on bearing capacity and energy dissipation performance was observed with increased straight segment length,geometric angles,and origami plate thickness.However,excessively large parameter values result in brace buckling under compression,diminishing energy dissipation capacity.展开更多
Using origami folding concepts to design novel mechanical metamaterials has recently become a prevalent framework.Inspired by the Kresling origami structure,this study proposes a double-layer Kresling origami metamate...Using origami folding concepts to design novel mechanical metamaterials has recently become a prevalent framework.Inspired by the Kresling origami structure,this study proposes a double-layer Kresling origami metamaterial with reprogrammable shock stiffness.Two combination strategies are constructed,each with different geometric constraints and kinematic compatibility.They are identified as assigned with same torsion direction(ASTD)and assigned with opposite torsion direction(AOTD),respectively.The shock stiffness of two double-layer Kresling origami metamaterials is analyzed using the finite element method,and results indicate that the AOTD metamaterial has superior impact resistance.Furthermore,the programmability of shock stiffness of the metamaterial is carried out comprehensively,and the influence of each design parameter is exhibited in detail.Finally,two prototypes of ASTD and AOTD metamaterials are fabricated,and experimental tests verify the analysis outcomes.This study provides a new approach to constructing mechanical metamaterials with reprogrammable shock stiffness for applications in energy absorption and vibration isolation engineering.展开更多
In this paper,a liquid-solid origami composite design is proposed for the improvement of impact resistance.Employing this design strategy,Kresling origami composite structures with different fillings were designed and...In this paper,a liquid-solid origami composite design is proposed for the improvement of impact resistance.Employing this design strategy,Kresling origami composite structures with different fillings were designed and fabricated,namely air,water,and shear thickening fluid(STF).Quasi-static compression and drop-weight impact experiments were carried out to compare and reveal the static and dynamic mechanical behavior of these structures.The results from drop-weight impact experiments demonstrated that the solid-liquid Kresling origami composite structures exhibited superior yield strength and reduced peak force when compared to their empty counterparts.Notably,the Kresling origami structures filled with STF exhibited significantly heightened yield strength and reduced peak force.For example,at an impact velocity of 3 m/s,the yield strength of single-layer STF-filled Kresling origami structures increased by 772.7%and the peak force decreased by 68.6%.This liquid-solid origami composite design holds the potential to advance the application of origami structures in critical areas such as aerospace,intelligent protection and other important fields.The demonstrated improvements in impact resistance underscore the practical viability of this approach in enhancing structural performance for a range of applications.展开更多
Objective This study aimed to investigate the clinical efficacy of laparoscopic training using origami,a traditional Japanese papercraft,using laparoscopic forceps to create origami cranes.Methods In this retrospectiv...Objective This study aimed to investigate the clinical efficacy of laparoscopic training using origami,a traditional Japanese papercraft,using laparoscopic forceps to create origami cranes.Methods In this retrospective study,4 surgeons were randomly divided into 2 groups:The training group,consisting of surgeons 1 and 2,and the non-training group,consisting of surgeons 3 and 4.Over the course of a one-year study period,the training group regularly underwent laparoscopic surgery training with a dry box,wherein they folded a total of 1000 origami cranes using laparoscopic instruments.The non-training group periodically underwent common laparoscopic surgery training of techniques such as suturing and ligation.Each surgeon regularly performed the transabdominal preperitoneal approach for inguinal hernias.Each training was conducted concurrently with the surgeries.The procedure time(peritoneum detachment,mesh placement,and closure of the peritoneum),total operation time(time from peritoneum detachment to closure of the peritoneum),and surgical outcomes were examined.Results The training group showed greater improvement in the total operation time and more stable performance than the non-training group.Additionally,the time taken for peritoneum detachment was significantly shorter in the training group.Conclusion Laparoscopic training using origami has the potential to enhance laparoscopic surgical skills and improve surgical outcomes.展开更多
The origami-based meta-structure has wide application in areas such as energy and wave transmission.Existingresearch has demonstrated the occurrence of supra-transmission in origami meta-structures and revealed its un...The origami-based meta-structure has wide application in areas such as energy and wave transmission.Existingresearch has demonstrated the occurrence of supra-transmission in origami meta-structures and revealed its underlying mechanism.However,studies on how to regulate the phenomenon of supra-transmission are still verylimited.In this work,we choose the meta-structure composed of stacked Miura-ori(SMO)as the subject.TheSMO unit possesses two topologically distinct stable configurations,enabling the meta-structure to possess a richvariety of periodic layouts.Based on the established equivalent dynamic model of the SMO-based meta-structure,we employ numerical simulation methods and find that the supra-transmission threshold could be adjusted bytuning the periodic layout of the meta-structure.Furthermore,the probability of supra-transmission is also highlydependent on the periodic layout.Increasing the number of SMO units under the bulged-out configuration in eachperiodic layout decreases the likelihood of supratransmission occurring.The findings of this study yield an extensive array of foundational insights into the wave dynamics of origami structures.Furthermore,these insightstranslate into practical guidelines for designing origami-based meta-structure with tunable and programmabledynamic characteristics.展开更多
Multi-stable origami structures and metamaterials possess unique advantages and could exhibit multiple stable three-dimensional configurations,which have attracted widespread research interest and held promise for app...Multi-stable origami structures and metamaterials possess unique advantages and could exhibit multiple stable three-dimensional configurations,which have attracted widespread research interest and held promise for applications in many fields.Although a great deal of attention has been paid to the design and application of multi-stable origami structures,less knowledge is available about the transition sequence among different stable configurations,especially in terms of the fundamental mechanism and the tuning method.To fill this gap,with the multi-stable dual-cell stacked Miura-ori chain as a platform,this paper explores the rules that govern the configuration transition and proposes effective methods for tuning the transition sequence.Specifically,by correlating the energy evolution,the transition paths,and the associated force-displace-ment profiles,we find that the critical extension/compression forces of the component cells play a critical role in governing the transition sequence.Accordingly,we summarize the rules for predicting the transition sequence:the component cell that first reaches the critical force during quasi-static extension or compression will be the first to undergo a configuration switch.Based on these findings,two methods,i.e.,a design method based on crease-stiffness assignment and an online method based on internal pressure regulation,are proposed to tune the stability profile and the transition sequence of the multi-stable origami structure.The crease-stiffness design approach,although effective,cannot be employed for online tuning once the prototype has been fabricated.The pressure-based approach,on the other hand,has been shown experimentally to be effective in adjusting the constitutive force-displacement profiles of the component cells and,in turn,tuning the transition sequence according to the summarized rules.The results of this study will advance the state of the art of origami mechanics and promote the engineering applications of multi-stable origami metamaterials.展开更多
Origami bellows are formed by folding flat sheets into closed cylindrical structures along predefined creases.As the bellows unfold,the volume of the origami structure will change significantly,offering potential for ...Origami bellows are formed by folding flat sheets into closed cylindrical structures along predefined creases.As the bellows unfold,the volume of the origami structure will change significantly,offering potential for use as inflatable deployable structures.This paper presents a geometric study of the volume of multi-stable Miura-ori and Kresling bellows,focusing on their application as deployable space habitats.Such habitats would be compactly stowed during launch,before expanding once in orbit.The internal volume ratio between different deployed states is investigated across the geometric design space.As a case study,the SpaceX Falcon 9 payload fairing is chosen for the transportation of space habitats.The stowed volume and effective deployed volume of the origami space habitats are calculated to enable comparison with conventional habitat designs.Optimal designs for the deployment of Miura-ori and Kresling patterned tubular space habitats are obtained using particle swarm optimisation(PSO)techniques.Configurations with significant volume expansion can be found in both patterns,with the Miura-ori patterns achieving higher volume expansion due to their additional radial deployment.A multi-objective PSO(MOPSO)is adopted to identify trade-offs between volumetric deployment and radial expansion ratios for the Miura-ori pattern.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.51805047 and 52175003)the Outstanding Youth Program of Hunan Education Department(Grant No.23B0335)the Natural Science Foundation of Hunan Province(Grant Nos.2023JJ30021 and 2023JJ50077).
文摘The introduction of wireless capsule endoscopy has brought a revolutionary change in the diagnostic procedures for gastrointestinal disorders.Biopsy,an essential procedure for disease diagnosis,has been integrated into robotic capsule endoscopy to augment diagnostic capabilities.In this study,we propose a magnetically driven biopsy robot based on a Kresling origami.Considering the bistable properties of Krelsing origami and the elasticity of the creases,a foldable structure of the robot with constant force characteristics is designed.The folding motion of the structure is used to deploy the needle into the target tissue.The robot is capable of performing rolling motion under the control of an external magnetic drive system,and a fine needle biopsy technique is used to collect deep tissue samples.We also conduct in vitro rolling experiments and sampling experiments on apple tissues and pork tissues,which verify the performance of the robot.
基金financial supports from National Key Research and Development Program of China(No.2022YFB3806200)。
文摘With the rapid development of holographic technology,metasurface-based holographic communication schemes have demonstrated immense potential for electromagnetic(EM)multifunctionality.However,traditional passive metasurfaces are severely limited by their lack of reconfigurability,hindering the realization of versatile holographic applications.Origami,an art form that mechanically induces spatial deformations,serves as a platform for multifunctional devices and has garnered significant attention in optics,physics,and materials science.The Miura-ori folding paradigm,characterized by its continuous reconfigurability in folded states,remains unexplored in the context of holographic imaging.Herein,we integrate the principles of Rosenfeld with L-and D-metal chiral enantiomers on a Miura-ori surface to tailor the aperture distribution.Leveraging the continuously tunable nature of the Miura-ori's folded states,the chiral response of the metallic structures varies across different folding configurations,enabling distinct EM holographic imaging functionalities.In the planar state,holographic encryption is achieved.Under specific folding conditions and driven by spin circularly polarized(CP)waves at a particular frequency,multiplexed holographic images can be reconstructed on designated focal planes with CP selectivity.Notably,the fabricated origami metasurface exhibits a large negative Poisson ratio,facilitating portability and deployment and offering novel avenues for spin-selective systems,camouflage,and information encryption.
基金supported in part by the Fundamental Research Funds for the Central Universities under Grant CSA-TS202404in part by the National Natural Science Foundation of China under Grant 12172226.
文摘The unique arrangement of panels and folds in origami structures provides distinct mechanical properties,such as the ability to achieve multiple stable states,reconfigure shapes,and adjust performance.However,combining movement and control functions into a simple yet efficient origami-based system remains a challenge.This study introduces a practical and efficient bistable origami mechanism,realized through lightweight and tailored designs in two bio-inspired applications.The mechanism is constructed from two thin materials:a PET sheet with precisely cut flexible hinges and a pre-tensioned elastic band.Its mechanical behavior is studied using nonlinear spring models.These components can be rearranged to create new bistable structures,enabling the integration of movement and partial control features.Inspired by natural systems,the mechanism is applied to two examples:a passive origami gripper that can quickly and precisely grasp moving objects in less than 100 ms,and an active magnetic-driven fish tail capable of high-speed swimming in multiple modes,reaching a maximum straight-line speed of 3.35 body lengths per second and a turning speed of 2.3 radians per second.This bistable origami mechanism highlights its potential for flexible design and high performance,offering useful insights for developing origami-based robotic systems.
基金supported by National Natural Science Foundation of China under Grant no.52475067.
文摘This paper presents an untethered pneumatic soft robot which can crawl both in horizontal and vertical pipes with different sizes and cross sections.This robot uses modular origami inspired soft-rigid hybrid actuator to produce telescoping and anchoring movements powered by vacuum pressure.The introduction of grooves to valley crease significantly lowers the full contraction vacuum pressure and improves the response,allowing the system can be driven by an onboard micro vacuum pump,enabling the possibility of miniaturization,integration,and untethered operation of the robot.A series of crawling experiments in pipes with different sizes and cross sections constructed by acrylic are conducted to validate the crawling performance of the robot.Within square cross-section pipes,the robot can achieve a velocity of 9.4 mm/s in horizontal crawling and 7.7 mm/s in vertical upward crawling.For horizontal crawling in circular pipes,it can reach a velocity of 8.0 mm/s.When fully charged,the robot can crawl for 40 min with a mileage of 16.649 m,which is sufficient for most drainage and industrial pipelines detection tasks.The robot demonstrates excellent endurance and speed performance that exceed most existing untethered soft pipe crawling robots.
基金supported by the National Key Research and Development Program of China(Nos.2021YFF1200300,2020YFA0909000)National Natural Science Foundation of China(Nos.22025404,32471426)+3 种基金Innovative Research Group of High-Level Local Universities in Shanghai(No.SHSMU-ZLCX20212602)Natural Science Foundation of Shanghai(No.23ZR1438700)Shanghai Municipal Health Commission(No.2022JC027)Shanghai Sailing Program(No.22YF1424400)。
文摘RNA offers distinct advantages for molecular self-assembly as a unique and programmable biomaterial.Recently,single-stranded RNA(ssRNA)origamis,capable of self-folding into defined nanostructures within a single-stranded RNA molecule,are considered a promising platform for immune recognition and therapy.Here,we utilize single-stranded rod RNA origami(Rod RNA-OG)as functional nucleic acid to synthesize valence-programmed RNA structures in a one-pot manner.We discover that the polyvalent RNA origamis are resistant to RNase degradation and can be efficiently internalized by macrophages for subsequent innate immune activation,even in the absence of any external protective agents such as lipids or polymers.The valence-programmed RNA origamis thus hold great promise as novel agonists for immunotherapy.
基金Project supported by the National Natural Science Foundation of China(Nos.12162004 and 11562001)the Doctoral Research Start-up Fund Project at University of South China(No.Y00043-13)。
文摘This paper presents,for the first time,an effective numerical approach based on the isogeometric analysis(IGA)and the six-variable quasi-three dimensional(3D)higher-order shear deformation theory(HSDT)to study the free vibration characteristics of functionally-graded(FG)graphene origami(GOri)-enabled auxetic metamaterial(GOEAM)plates submerged in a fluid medium.The plate theory incorporates the thickness stretching and the effects of transverse shear deformation without using any shear correction factors.The velocity potential function and Bernoulli's equation are used to derive the hydrodynamic pressure acting on the plate surface.Both horizontally and vertically immersed plate configurations are considered here in the form of inertia effects.The plates are composed of multilayer GOEAMs,with the GOri content varying through the plate's thickness in a layer-wise manner.This design results in graded auxetic growth.The material properties are evaluated by mixing rules and a genetic programming(GP)-assisted micromechanical model.The governing equations of motion for the FG-GOEAM plates immersed in a fluid medium are derived by Hamilton's principle.After validating the convergence and accuracy of the present model,a comprehensive parametric study is carried out to examine the effects of the GOri content,GOri distribution pattern,GOri folding degree,fluid level,immersed depth,and geometric parameter on the natural frequencies of the FG-GOEAM plates.The results show that the natural frequencies for the four GOri distribution patterns increase with the increase in the layer number when the lay number is fewer than 10,and then stabilize after the layer number reaches 10.Besides,in general,the natural frequency of the FG-GOEAM plate in a vacuum or fluid increases when the GOri content increases,while decreases when the GOri folding degree increases.Some additional findings related to the numerical results are presented in the conclusions.It is believed that the present results are useful for the precise design and optimization of FG-GOEAM plates immersed in a fluid medium.
基金supported by the National Natural Science Foundation of China 11821202(Xu Guo)the National Key Research and Development Plan 2020YFB1709401(Xu Guo)the Liaoning Revitalization Talents Program XLYC2001003(Xu Guo)。
文摘Most existing treatments for origami-folding simulations have focused on regular-shaped configurations.This article aims to introduce a general strategy for simulating and analyzing the deformation process of irregular shapes by means of computational capabilities nowadays.To better simulate origami deformation with folding orders,the concept of plane follow-up is introduced to achieve automated computer simulation of complex folding patterns,thereby avoiding intersection and penetration between planes.Based on the evaluation criteria such as the lowest storage energy with tightening and the fastest pace from tightening to unfolding,the optimal crease distribution patterns for four irregular(‘N’-,‘T’-,‘O’-,and‘P’-shaped)origami configurations are then presented under five candidates.When the dimensions of the origami are fixed,it is discovered that simpler folding patterns lead to faster deformation of the origami configuration.When the folding complexity is fixed,higher strain energy results in more rapid origami expansion.
基金supported by the National Natural Science Foundation of China(22322702,32071389,22025201,22102038,22107022,21721002,21773044)the National Key R&D Program of China National Basic Research Program of China(2021YFA1200302,2021YFA1201201,2018YFA0208900)+2 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(XDB36000000)the Youth Innovation Promotion Association,CAS,the CAS Interdisciplinary Innovation Team and the K.C.Wong Education Foundation(GJTD-2018-03)CAS Project for Young Scientists in Basic Research(YSBR-036).
文摘Precise design and control of molecular self-assembly as living creatures are exciting ideas in the field of nanotechnology.Characterized with predesigned geometries and accurate spatial addressability,programmable DNA origami nanostructures have been recognized as optimized tools for assembling multiple functional components.A variety of biomolecules can be attached to the nanoscale drawing boards in a site-specific fashion,thus facilitating the precise construction of DNA origami-based materials for studies on biological interface.In this minireview,we highlight the recent advances in the precise construction of DNA origami-based materials with artificial bio-structures and/or biomimicking functions.The regulation of biological functions by these DNA origami-engineered assemblies at the bio-interface has been summarized and discussed.
基金supported by the Chinese Studentship Council(Grant No.201908060224)the National Natural Science Foundation of China (Grant Nos.11872310,11972308)。
文摘In this paper,the design,manufacture and testing of an origami protective shield with a supporting frame structure are presented.It consists of an origami shield surface and a deployable supporting frame structure that needs to be portable and sufficiently stiff.First,for the design of the shield surface,a threestage origami crease pattern is developed to reduce the shield size in the folded state.The shield surface consists of several stiff modular panels and layered with flexible fabric.The modular panels are made of a multi-layer composite where a ceramic layer is made of small pieces to improve durability as those small pieces enable restriction of crack propagation.Then,the supporting frame structure is designed as a chain-of-bars structure in order to fold into a highly compact state as a bundle of bars and deploy in sequence.Thus,a feature-driven topology structural optimization method preserving component sequence is developed where the inter-dependence of sub-structures is taken into account.A bar with semi-circular ends is used as a basic design feature.The positions of the bar’s end points are treated as design variables and the width of the bars is kept constant.Then,a constraint on the total length of the chain of bars is introduced.Finally,the modular panels made of multi-layer composite and the full-scale prototype of the origami shield are fabricated and tested to verify the bullet-proof performance.
基金Supported by the National Research Foundation of South Korea(No.NRF-2021R1A4A1032783)the National Research Foundation of Korea(NRF),the Korea government(MSIT)(No.2022R1C1C1003718).
文摘The multidisciplinary space environment,encompassing orbital debris,cosmic radiation,and solar radiative heat,poses significant risks to spacecraft and astronauts,necessitating efficient and effective shielding solutions.A multi-layer shield with wide spacing has been proven to be an effective way to shield the spacecraft from space debris impact;however,due to the limited volume of the payload fairing,it was not feasible to apply a multi-layer shield to the spacecraft fuselage.Through the origami design,the shield maintains a compact form during launch and subsequently expands in outer space to enhance protection.Through geometric analysis,it has been confirmed that the deployable multi-layer space shield can occupy less space than conventional space shield structures while expanding into wider shield intervals and multiple layers.Through hypervelocity impact experiments,it was confirmed that as the bumper spacing of the multi-layer space shield expands,its ballistic performance becomes superior to conventional space structures.The deployable multi-layer space shield can reduce not only hypervelocity impacts but also solar radiative heat using the same mechanism as multi-layer insulation.Through cosmic radiation dose analysis,it has been confirmed that the multi-layer space shield is effective in cosmic radiation shielding compared to conventional space structures.
基金supported by Scientific Research Project of Qiqihar University(145209130)supported by the Natural Science Foundation of Inner Mongolia Autonomous Region of China(Grant No.2023LHMS05054 and 2023LHMS05017)+3 种基金the Inner Mongolia University of Technology Natural Science Foundation of China(Grant No.DC2200000903)the Program for Innovative Research Teams in Universities of the Inner Mongolia Autonomous Region of China(Grant No.NMGIRT2213)the key technological project of Inner Mongolia(Grant No.2021GG0255 and 2021GG0259)the Fundamental Research Funds for the directly affiliated Universities of Inner Mongolia Autonomous Region(Grant No.JY20220046)。
文摘The present work investigates higher order stress,strain and deformation analyses of a shear deformable doubly curved shell manufactures by a Copper(Cu)core reinforced with graphene origami auxetic metamaterial subjected to mechanical and thermal loads.The effective material properties of the graphene origami auxetic reinforced Cu matrix are developed using micromechanical models cooperate both material properties of graphene and Cu in terms of temperature,volume fraction and folding degree.The principle of virtual work is used to derive governing equations with accounting thermal loading.The numerical results are analytically obtained using Navier's technique to investigate impact of significant parameters such as thermal loading,graphene amount,folding degree and directional coordinate on the stress,strain and deformation responses of the structure.The graphene origami materials may be used in aerospace vehicles and structures and defence technology because of their low weight and high stiffness.A verification study is presented for approving the formulation,solution methodology and numerical results.
基金supported by the Australian Research Council(Nos.LP180100005,DP210103656,DP230100548).
文摘Brittleness remains the key bottleneck for graphene to be used as impact protection materials and this obstacle can be overcome by origami-modified graphene.Herein we employed molecular dynamics sim-ulation to investigate the perforation behaviours of graphene origami(GOri)under ballistic impact from a diamond projectile.We found that the threshold penetration velocity of GOri can be improved signifi-cantly by 46.27%compared with that of its pristine counterpart.Under a small ballistic impact loading at a low speed,GOri experiences a unique unfolding process and hence has improved impact-resistance performance.Depending on the initial velocity of the projectile,three different penetration phenomena are observed,i.e.bounce-back,capture,and perforation state.The penetration energy depends on the roughness of GOri,the initial impact velocity,the projectile’s radius and the layer number.This study provides useful insights into the perforation behaviours and energy absorption of GOri and offers useful guidelines for graphene applications as impact protection materials.
基金partially supported by the National Key R&D Program of China(Grant No.2022YFB2602700)the National Natural Science Foundation of China(Grant No.52378216)+1 种基金the National Natural Science Foundation of China for Excellent Young Scientists Fundthe Fundamental Research Funds for the Central Universities(Grant No.2022CDJKYJH052).
文摘Cellular structures are commonly used to design energy-absorbing structures,and origami structures are becominga prevalent method of cellular structure design.This paper proposes a foldable cellular structure based on theWaterbomb origami pattern.The geometrical configuration of this structure is described.Quasi-static compressiontests of the origami tube cell of this cellular structure are conducted,and load-displacement relationship curvesare obtained.Numerical simulations are carried out to analyze the effects of aspect ratio,folding angle,thicknessand number of layers of origami tubes on initial peak force and specific energy absorption(SEA).Calculationformulas for initial peak force and SEA are obtained by the multiple linear regression method.The degree ofinfluence of each parameter on the mechanical properties of the single-layer tube cell is compared.The resultsshow that the cellular structure exhibits negative stiffness and periodic load-bearing capacity,as well as foldingangle has the most significant effect on the load-bearing and energy-absorbing capacity.By adjusting the designparameters,the stiffness,load-bearing capacity and energy absorption capacity of this cellular structure can beadjusted,which shows the programmable mechanical properties of this cellular structure.The foldability andthe smooth periodic load-bearing capacity give the structure potential for application as an energy-absorbing structure.
基金supported by the National Natural Science Foundation of China(Grant Nos.U1937202 and 52008064)the Innovation Support Plan-International Cooperation Project(BZ2022049)+1 种基金the Special Foundation for Central Guidance of Local Science and Technology of Shenzhen,China(Grant No.2021Szvup027)The first author acknowledges the scholarship(financial support)received from the China Scholarship Council(202106090085).
文摘A local design scheme for origami energy dissipation braces was proposed by combining local Miura units at both ends and a straight segment in the middle.This design was implemented to address the issue of uneven axial stiffness observed in global origami braces.Globally and locally designed origami braces were simulated and compared under cyclic loading to validate the advantages of the proposed design scheme in terms of hysteretic properties.Additionally,an analysis was conducted on the designed braces with varying straight segment lengths,geometric angles,and origami plate thicknesses for comparison.Results indicate that the local design significantly increases the tensile bearing load,enhances the anti-buckling capability,and improves the energy dissipation performance compared to the global design.The positive impact on bearing capacity and energy dissipation performance was observed with increased straight segment length,geometric angles,and origami plate thickness.However,excessively large parameter values result in brace buckling under compression,diminishing energy dissipation capacity.
基金supported by the National Natural Science Foundations of China(Grant Nos.52105011 and 52305014)the Young Innovative Talents Project of Guangdong Province(Grant No.2021KQNCX071)+2 种基金the Guangdong Provincial Education and Research Projects(Grant No.2021GXJK173)the“Yangcheng Scholars”scientific research project of Guangzhou(Grant No.202235334)the Basic and applied basic research projects of Guangzhou(Grant No.2022JXGG108)。
文摘Using origami folding concepts to design novel mechanical metamaterials has recently become a prevalent framework.Inspired by the Kresling origami structure,this study proposes a double-layer Kresling origami metamaterial with reprogrammable shock stiffness.Two combination strategies are constructed,each with different geometric constraints and kinematic compatibility.They are identified as assigned with same torsion direction(ASTD)and assigned with opposite torsion direction(AOTD),respectively.The shock stiffness of two double-layer Kresling origami metamaterials is analyzed using the finite element method,and results indicate that the AOTD metamaterial has superior impact resistance.Furthermore,the programmability of shock stiffness of the metamaterial is carried out comprehensively,and the influence of each design parameter is exhibited in detail.Finally,two prototypes of ASTD and AOTD metamaterials are fabricated,and experimental tests verify the analysis outcomes.This study provides a new approach to constructing mechanical metamaterials with reprogrammable shock stiffness for applications in energy absorption and vibration isolation engineering.
基金supported by the National Natural Science Foundation of China(Grant Nos.12302151 and 52105575)the BIT Research and Innovation Promoting Project(Grant No.2023YCXY049)+2 种基金the Fundamental Research Funds for the Central Universities(Grant No.QTZX23063)the Aeronautical Science Foundation of China(Grant No.2022Z073081001)the Open Research Funds of State Key Laboratory of Intelligent Manufacturing Equipment and Technology(Grant No.IMETKF2024008).
文摘In this paper,a liquid-solid origami composite design is proposed for the improvement of impact resistance.Employing this design strategy,Kresling origami composite structures with different fillings were designed and fabricated,namely air,water,and shear thickening fluid(STF).Quasi-static compression and drop-weight impact experiments were carried out to compare and reveal the static and dynamic mechanical behavior of these structures.The results from drop-weight impact experiments demonstrated that the solid-liquid Kresling origami composite structures exhibited superior yield strength and reduced peak force when compared to their empty counterparts.Notably,the Kresling origami structures filled with STF exhibited significantly heightened yield strength and reduced peak force.For example,at an impact velocity of 3 m/s,the yield strength of single-layer STF-filled Kresling origami structures increased by 772.7%and the peak force decreased by 68.6%.This liquid-solid origami composite design holds the potential to advance the application of origami structures in critical areas such as aerospace,intelligent protection and other important fields.The demonstrated improvements in impact resistance underscore the practical viability of this approach in enhancing structural performance for a range of applications.
文摘Objective This study aimed to investigate the clinical efficacy of laparoscopic training using origami,a traditional Japanese papercraft,using laparoscopic forceps to create origami cranes.Methods In this retrospective study,4 surgeons were randomly divided into 2 groups:The training group,consisting of surgeons 1 and 2,and the non-training group,consisting of surgeons 3 and 4.Over the course of a one-year study period,the training group regularly underwent laparoscopic surgery training with a dry box,wherein they folded a total of 1000 origami cranes using laparoscopic instruments.The non-training group periodically underwent common laparoscopic surgery training of techniques such as suturing and ligation.Each surgeon regularly performed the transabdominal preperitoneal approach for inguinal hernias.Each training was conducted concurrently with the surgeries.The procedure time(peritoneum detachment,mesh placement,and closure of the peritoneum),total operation time(time from peritoneum detachment to closure of the peritoneum),and surgical outcomes were examined.Results The training group showed greater improvement in the total operation time and more stable performance than the non-training group.Additionally,the time taken for peritoneum detachment was significantly shorter in the training group.Conclusion Laparoscopic training using origami has the potential to enhance laparoscopic surgical skills and improve surgical outcomes.
基金supported by the National Natural Science Foundation of China(Grant Nos.12272096 and 11932015)the Shanghai Pilot Program for Basic Research-Fudan University(Grant No.21TQ1400100-22TQ009).
文摘The origami-based meta-structure has wide application in areas such as energy and wave transmission.Existingresearch has demonstrated the occurrence of supra-transmission in origami meta-structures and revealed its underlying mechanism.However,studies on how to regulate the phenomenon of supra-transmission are still verylimited.In this work,we choose the meta-structure composed of stacked Miura-ori(SMO)as the subject.TheSMO unit possesses two topologically distinct stable configurations,enabling the meta-structure to possess a richvariety of periodic layouts.Based on the established equivalent dynamic model of the SMO-based meta-structure,we employ numerical simulation methods and find that the supra-transmission threshold could be adjusted bytuning the periodic layout of the meta-structure.Furthermore,the probability of supra-transmission is also highlydependent on the periodic layout.Increasing the number of SMO units under the bulged-out configuration in eachperiodic layout decreases the likelihood of supratransmission occurring.The findings of this study yield an extensive array of foundational insights into the wave dynamics of origami structures.Furthermore,these insightstranslate into practical guidelines for designing origami-based meta-structure with tunable and programmabledynamic characteristics.
基金supported by the National Key Research and Development Program ofChina(Grant No.2020YFB1312900)the National Natural Science Foundation of China(Grant Nos.12272096,11932015)the Shanghai Pilot Program forBasicResearch-Fudan University 21TQ1400100-22TQ009.
文摘Multi-stable origami structures and metamaterials possess unique advantages and could exhibit multiple stable three-dimensional configurations,which have attracted widespread research interest and held promise for applications in many fields.Although a great deal of attention has been paid to the design and application of multi-stable origami structures,less knowledge is available about the transition sequence among different stable configurations,especially in terms of the fundamental mechanism and the tuning method.To fill this gap,with the multi-stable dual-cell stacked Miura-ori chain as a platform,this paper explores the rules that govern the configuration transition and proposes effective methods for tuning the transition sequence.Specifically,by correlating the energy evolution,the transition paths,and the associated force-displace-ment profiles,we find that the critical extension/compression forces of the component cells play a critical role in governing the transition sequence.Accordingly,we summarize the rules for predicting the transition sequence:the component cell that first reaches the critical force during quasi-static extension or compression will be the first to undergo a configuration switch.Based on these findings,two methods,i.e.,a design method based on crease-stiffness assignment and an online method based on internal pressure regulation,are proposed to tune the stability profile and the transition sequence of the multi-stable origami structure.The crease-stiffness design approach,although effective,cannot be employed for online tuning once the prototype has been fabricated.The pressure-based approach,on the other hand,has been shown experimentally to be effective in adjusting the constitutive force-displacement profiles of the component cells and,in turn,tuning the transition sequence according to the summarized rules.The results of this study will advance the state of the art of origami mechanics and promote the engineering applications of multi-stable origami metamaterials.
文摘Origami bellows are formed by folding flat sheets into closed cylindrical structures along predefined creases.As the bellows unfold,the volume of the origami structure will change significantly,offering potential for use as inflatable deployable structures.This paper presents a geometric study of the volume of multi-stable Miura-ori and Kresling bellows,focusing on their application as deployable space habitats.Such habitats would be compactly stowed during launch,before expanding once in orbit.The internal volume ratio between different deployed states is investigated across the geometric design space.As a case study,the SpaceX Falcon 9 payload fairing is chosen for the transportation of space habitats.The stowed volume and effective deployed volume of the origami space habitats are calculated to enable comparison with conventional habitat designs.Optimal designs for the deployment of Miura-ori and Kresling patterned tubular space habitats are obtained using particle swarm optimisation(PSO)techniques.Configurations with significant volume expansion can be found in both patterns,with the Miura-ori patterns achieving higher volume expansion due to their additional radial deployment.A multi-objective PSO(MOPSO)is adopted to identify trade-offs between volumetric deployment and radial expansion ratios for the Miura-ori pattern.
