Nowadays sandwich structures with foldcores have extensive applications in aviation and aerospace fields,which are considered better than honeycomb sandwich structures to some extent.This paper explores the thermal–m...Nowadays sandwich structures with foldcores have extensive applications in aviation and aerospace fields,which are considered better than honeycomb sandwich structures to some extent.This paper explores the thermal–mechanical properties of cylindrical sandwich structures(CSS)with four kinds of foldcores,including Axial Miura,Circumferential Miura,Diamond,and Kresling foldcores.Sequential coupled thermal stress simulation and axial N compression simulation with ABAQUS are implemented to aluminum CSS with the four kinds of foldcores,which are subjected to mono-direction heat flux.Moreover,the simulation results are compared with that of CSS with honeycomb core,and compared the thermal mechanical properties of different structures and different N(the number of unit cell in one circle).It is found that with the increase of N,the thermal mechanical properties of CSS with Axial and Circumferential Miura foldcores become better.Besides,CSS with multi-layered foldcores exhibit more uniform temperature distribution,which is favored in design of satellite.In addition,the strength and the stiffness of CSS increase as increases and are lower with mono-direction heat flux than without heat flux.Especially,CSS with two-layered Axial Miura foldcores exhibit better thermal–mechanical properties than all the other models.展开更多
Origami foldcore structures can be used in thin-walled sandwich panels to provide unique advantages over traditional honey-comb structures.For instance,their continuously connected space is available for flowing throu...Origami foldcore structures can be used in thin-walled sandwich panels to provide unique advantages over traditional honey-comb structures.For instance,their continuously connected space is available for flowing through cooling liquid or compact pipeline placement.However,origami foldcores suffer from relatively low-energy absorption.This paper proposes a new design of energy-absorbing foldcore structures for sandwich panels,including the geometric design,experimental tests,numerical parametric study,and theoretical estimation of energy absorption.Origami initiators are introduced to the Miura foldcores to induce a failure mode with more transverse folds,which is not common for regular foldcore structures.As a result,60%higher energy absorption and tunable load uniformity can be achieved.展开更多
Foldcores are considered as a kind of lightweight sandwich structures that have the potential to replace honeycomb core materials,especially in the field of aerospace manufacturing.Although foldcores based on Miura-or...Foldcores are considered as a kind of lightweight sandwich structures that have the potential to replace honeycomb core materials,especially in the field of aerospace manufacturing.Although foldcores based on Miura-ori and its derivative configurations have been extensively studied,such foldcores are relatively weak at the junction between the core material and the skin.The generalized Resch-based foldcores that can solve this defect are researched in this paper.We first compared the static mechanical properties of the triangular,quadrilateral,and hexagonal generalized Resch patterns during compression.The mechanical properties were analyzed using a fast tool called MERLIN and compared with the finite element method’s results.The results show that among the three types of configurations with the same height,the triangular generalized Resch element has greater stiffness and energy barrier to transform.As the number of sides of the basic polygon increases,the stiffness and energy barrier become smaller.展开更多
文摘Nowadays sandwich structures with foldcores have extensive applications in aviation and aerospace fields,which are considered better than honeycomb sandwich structures to some extent.This paper explores the thermal–mechanical properties of cylindrical sandwich structures(CSS)with four kinds of foldcores,including Axial Miura,Circumferential Miura,Diamond,and Kresling foldcores.Sequential coupled thermal stress simulation and axial N compression simulation with ABAQUS are implemented to aluminum CSS with the four kinds of foldcores,which are subjected to mono-direction heat flux.Moreover,the simulation results are compared with that of CSS with honeycomb core,and compared the thermal mechanical properties of different structures and different N(the number of unit cell in one circle).It is found that with the increase of N,the thermal mechanical properties of CSS with Axial and Circumferential Miura foldcores become better.Besides,CSS with multi-layered foldcores exhibit more uniform temperature distribution,which is favored in design of satellite.In addition,the strength and the stiffness of CSS increase as increases and are lower with mono-direction heat flux than without heat flux.Especially,CSS with two-layered Axial Miura foldcores exhibit better thermal–mechanical properties than all the other models.
基金funded by the National Natural Science Foundation of China(Grant No.12202320)the Guangdong Basic and Applied Basic Research Foundation(Grant No.2021A1515110589).
文摘Origami foldcore structures can be used in thin-walled sandwich panels to provide unique advantages over traditional honey-comb structures.For instance,their continuously connected space is available for flowing through cooling liquid or compact pipeline placement.However,origami foldcores suffer from relatively low-energy absorption.This paper proposes a new design of energy-absorbing foldcore structures for sandwich panels,including the geometric design,experimental tests,numerical parametric study,and theoretical estimation of energy absorption.Origami initiators are introduced to the Miura foldcores to induce a failure mode with more transverse folds,which is not common for regular foldcore structures.As a result,60%higher energy absorption and tunable load uniformity can be achieved.
基金The financial support from the Shanghai Aerospace Science and Technology Innovation Fund(SAST)is gratefully acknowledged.
文摘Foldcores are considered as a kind of lightweight sandwich structures that have the potential to replace honeycomb core materials,especially in the field of aerospace manufacturing.Although foldcores based on Miura-ori and its derivative configurations have been extensively studied,such foldcores are relatively weak at the junction between the core material and the skin.The generalized Resch-based foldcores that can solve this defect are researched in this paper.We first compared the static mechanical properties of the triangular,quadrilateral,and hexagonal generalized Resch patterns during compression.The mechanical properties were analyzed using a fast tool called MERLIN and compared with the finite element method’s results.The results show that among the three types of configurations with the same height,the triangular generalized Resch element has greater stiffness and energy barrier to transform.As the number of sides of the basic polygon increases,the stiffness and energy barrier become smaller.
