Research On The Constitutive Model Of Porous SMAs

Porous shape memory alloy is a new biomedical materials. Because it has shape memory effect, pseudoelasticity excellent mechanical properties and porous structure, so it show a enormous advantages of bionic in biomedical field. In particular, as the hard tissue replacement materials it has good Medical prospects.In recent years, the research about porous shape memory alloy focus on preparation and experiments. In order to better application of this material and study its potential, so it is needed to establish a simple, accurate constitutive model of porous shape memory alloy.Based on the average micromechanics method and Boyd-Lagoudas model, we establish a constitutive model of porous shape memory alloy through introduction of hydrostatic pressure to reform the transfomation tensor. Meanwhile introducing return mapping algorithms to ensure the transformation consistency conditions. Then we use the replacement of spherical pore method to implement the constitutive model and compare with experimental curves. The result indicate that the constitutive model is feasible, as a porous shape memory alloy design and the use of the theory.