Two different material models(mutilinear elastic mode l and bilinear isotropic hardening model) were used to carry out the
finite elemen t analysis of TiNi shape memory alloy with
pseudoelasticity feature under normal force load. The results show that the mutilinear elastic model is not appropria te for analyzing the pseudoelasticity of TiNi alloy, but through using the maxim um elastic deformation (the strain value at the yield point) to simulate the pse udoelasticity of TiNi shape memory alloy, the bilinear isotropic hardening model can describe the relationships between the pseudoelasticity of TiNi shape memor y alloys and strains including elastic strain and plastic strain. The results go tten from this analysis using the bilinear isotropic hardening model can be used to provide the reference for designing TiNi alloy as
smart material and anti-w ear material. Finally, under the bilinear isotropic hardening model, the relatio nship between load and displacement gotten from FEM was compared with that deriv ed from nanoindenter, results indicate that they are at close range.