A numerical study of mechanical behavior of NiTi shape memory alloy stents under radial loading condition for use in peripheral artery

NiTi shape memory alloy stents can be used for peripheral artery due to the reduction of problems such as improper dynamic behavior, low torsional capability and insufficient radial strength. In this paper, the finite element method used to study the metallurgical, mechanical and clinical behavior of NiTi shape memory alloy stents for application in peripheral artery by applying radial strain according to the standard .Material properties model of NiTi shape memory alloy was based on Helmholtz free thermodynamic energy (Auricchio model) and phase change equation of martensite transformation based on Liang and Rogers model. With changing the Af temperature from 293 to 303 K, NiTi shape memory alloy stents have better mechanical and clinical performance due to the applied force to the artery, optimal radial strength, and complete hysteresis loop depending on superelastic behavior, less stress and more strain. This numerical study can provide a good way to study the mechanical behavior of stents used in the peripheral artery with respect to the effects of metallurgical and mechanical properties.