Influence of visco-plastic matrix on deformation behavior of shape memory alloy composite

摘要

For composites containing NiTi fiber or Ti fiber in a polycarbonate (PC) matrix, uniaxial tensile loading unloading tests were carried out. NiTi fiber shows psuedoelasticity (PE) at room temperature. Furthermore, the constitutive relation of shape memory alloy composites (SMAC) has been proposed taking visco plasticity of the matrix into consideration, and some numerical simulations for the deformation behavior of NiTi PC have been carried out under uniaxial tensile loading unloading and thermo mechanical loading. The overstress visco-plasticity model was used for visco plastic matrix, and Brinson's model was used for shape memory alloy fiber. From the experimental and numerical results, the following conclusions are obtained. (1) The numerical results of the deformation behavior show good agreement with the experimental ones. (2) As compared with PE/Elasto plastic composites, PE/PC composites exhibit psuedoelastic deformation behavior, while the compressive residual stress in the matrix after tensile loading unloading is relatively low. (3) SME/PC composites show large contraction due to an elevation of temperature after tensile loading unloading, while the compressive residual stress in the matrix is low.