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
Micro-cylindrical temperature sensors are crucial components for in-situ physiological signal monitoring in smart healthcare and minimally invasive surgical systems.However,due to the high-curvature complexity of the ...Micro-cylindrical temperature sensors are crucial components for in-situ physiological signal monitoring in smart healthcare and minimally invasive surgical systems.However,due to the high-curvature complexity of the substrates,highprecision microfabrication on micro-cylindrical surfaces still faces significant challenges.This study proposes a microcylindrical electrohydrodynamic printing process to achieve on-demand high-resolution patterning on high-curvature surfaces with diameters ranging from 55μm to 10 mm,addressing issues of mapping errors and stress concentration in array sensors integrated on micro-cylindrical surfaces.A physical model of micro-cylindrical electrohydrodynamic printing is established based on two-phase flow electrohydrodynamics to analyze the factors affecting the formation of stable cone-jets and the deposition of ink droplets on curved surfaces.Considering the elongated and high-curvature characteristics of micro-cylindrical objects,a printing system is designed with four degrees of freedom,coupling object rotation and translation.Numerical simulations reveal the patterns of electric field distortion caused by the horizontal offset of the nozzle relative to the vertical symmetry axis of the object,while experimental results identify the printing windows for inks of varying viscosities,voltages,and printing heights.Finally,a temperature sensor array is fabricated on the micro-cylindrical surface(sensor line width~150μm,lead wire width less than 50μm,sensitivity~0.00106),validating the consistency and stability of the array sensors and enabling temperature measurements in the range of 20℃‒100℃.Additionally,the capability of the sensors array for temperature monitoring in simulated narrow cavity heating environments is demonstrated,exploring a novel method for fabricating advanced minimally invasive surgical instruments.展开更多
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.
基金supported by the National Key Research and Development Program of China(Grant No.2021YFB3200700)the National Natural Science Foundation of China(Grant Nos.U23A20111,52175536,52188102).
文摘Micro-cylindrical temperature sensors are crucial components for in-situ physiological signal monitoring in smart healthcare and minimally invasive surgical systems.However,due to the high-curvature complexity of the substrates,highprecision microfabrication on micro-cylindrical surfaces still faces significant challenges.This study proposes a microcylindrical electrohydrodynamic printing process to achieve on-demand high-resolution patterning on high-curvature surfaces with diameters ranging from 55μm to 10 mm,addressing issues of mapping errors and stress concentration in array sensors integrated on micro-cylindrical surfaces.A physical model of micro-cylindrical electrohydrodynamic printing is established based on two-phase flow electrohydrodynamics to analyze the factors affecting the formation of stable cone-jets and the deposition of ink droplets on curved surfaces.Considering the elongated and high-curvature characteristics of micro-cylindrical objects,a printing system is designed with four degrees of freedom,coupling object rotation and translation.Numerical simulations reveal the patterns of electric field distortion caused by the horizontal offset of the nozzle relative to the vertical symmetry axis of the object,while experimental results identify the printing windows for inks of varying viscosities,voltages,and printing heights.Finally,a temperature sensor array is fabricated on the micro-cylindrical surface(sensor line width~150μm,lead wire width less than 50μm,sensitivity~0.00106),validating the consistency and stability of the array sensors and enabling temperature measurements in the range of 20℃‒100℃.Additionally,the capability of the sensors array for temperature monitoring in simulated narrow cavity heating environments is demonstrated,exploring a novel method for fabricating advanced minimally invasive surgical instruments.
