Design And Verification Of Intelligent Chiral Structure With Adaptive Deformation

Shape memory alloy is a new type of intelligent material developed in recent decades.According to the different materials,it can be divided into three categories.NiTi shape memory alloy was first found and widely used in military and medical fields,while the application of memory alloy mostly stays in the realization of simple deformation through the use of its own memory characteristics.Chiral metamaterials can achieve multidimensional deformation under unidirectional loading.In this paper,an intelligent and controllable deformation structure is assembled by combining the memory characteristics of memory alloy with the deformation characteristics of chiral metamaterials.Based on the research results of domestic and foreign scholars,the deformation of different chiral cell structures is studied to find an optimal deformation structure,and the best deformation effect is achieved by optimizing its internal structure.The deformation effect of different cell combinations is verified by 3D printing model.The deformation characteristics of NiTi shape memory alloy and the material properties under martensite and austenite were studied.The feasibility of electric driving of NiTi shape memory alloy was explored by testing different deformation driving modes of NiTi shape memory alloy.The residual deformation of shape memory alloy components under unidirectional compression is studied,and by reducing the uncontrollable variables of the cell body during deformation,the cell body is optimized to make its deformation more regular and realize its quantitative design.By studying the deformation characteristics of the quantified chiral cell in the finite element software,the concept of chiral deformation degree is introduced,and the residual deformation law of the chiral cell under unidirectional compression is obtained,so as to realize the independent deformation design of the cell.By optimizing the structure of the original cell body,the deformation effect of the cell body can be quantified,and the feasibility of its practical application can be increased.Finally,the deformation and recovery of NiTi shape memory alloy components under independent design were verified by 3D printing.