|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||Effect of Porosity on the Stress-strain Response and Hysteretic Energy Dissipation Capacity of NiTi Shape Memory Alloys
||George N. Frantziskonis, Sourav Gur, Krishna Muralidharan
|On-Site Speaker (Planned)
Recent studies show that the super-elasticity in NiTi shape memory alloys (SMAs) can be altered through the introduction of porosity. The present study demonstrates the effects of porosity on the hysteretic energy dissipation capacity of the super-elastic NiTi SMA. Based on the integrated computational materials engineering approach, at the continuum scale, non-linear stress-strain equations (with experimental model parameters) for a NiTi bar are solved, under stress-controlled loading. Similarly, at the nanometer scale, molecular dynamics simulations are performed on bulk porous NiTi. Results at the continuum scale show that with increasing porosity the energy dissipation capacity varies non-monotonically, i.e. initially increases and then decreases after a certain critical value of porosity, while at the atomic scale, it increases monotonically. Finally, the energy dissipation capacity of porous NiTi is 3.8 and 2.3 times that of the non-porous NiTi, at the continuum and atomic scales, respectively.
||Planned: Supplemental Proceedings volume