Table of Contents
Smart Materials Research
Volume 2013, Article ID 749296, 13 pages
http://dx.doi.org/10.1155/2013/749296
Research Article

Density Dependence of the Macroscale Superelastic Behavior of Porous Shape Memory Alloys: A Two-Dimensional Approach

1Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, QC, Canada H3C 1K3
2Mechanical and Materials Engineering Group, Engineering Department, European Organization for Nuclear Research (CERN), 1211 Geneva, Switzerland

Received 5 April 2013; Accepted 15 June 2013

Academic Editor: Outi Söderberg

Copyright © 2013 Guillaume Maîtrejean et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Porous Shape Memory Alloys (SMAs) are of particular interest for many industrial applications, as they combine intrinsic SMA (shape memory effect and superelasticity) and foam characteristics. The computational cost of direct porous material modeling is however extremely high, and so designing porous SMA structure poses a considerable challenge. In this study, an attempt is made to simulate the superelastic behavior of porous materials via the modeling of fully dense structures with material properties modified using a porous/bulk density ratio scaling relation. Using this approach, direct modeling of the porous microstructure is avoided, and only the macroscale response of the model is considered which contributes to a drastic reduction of the computational cost. Foam structures with a gradient of porosity are also studied, and the prediction made using the fully dense material model is shown to be in agreement with the mesoscale porous material model.