Monday, 11 October 2004 - 2:15 PM

This presentation is part of : Rajagopal Symposium

Constitutive Modelling of Shape Memory Alloys and Effective Properties of Fluid Saturated Porous Shape Memory Alloys

Dimitris C. Lagoudas1, Peter Popov1, and Oleg Iliev2. (1) Texas A&M University, College Station, TX 77843, (2) Fraunhofer Institut fuer Techno- und Wirtschaftsmathematik, Kaiserslautern, D-67657, Germany

A comprehensive three-dimensional model for Shape Memory Alloys is developed. The model accounts in a unified manner for the different effects of the martensitic transformation observed during non-proportional loading, such as detwinning and reorientation of the martensitic variants, as well as tension/compression asymmetry. The simultaneous reverse transformation of the two types of martensite into austenite is also addressed. Different hardening functions are used to better capture the material response in pseudoelastic and detwinning regimes. The model is used in conjunction with a fluid-structure solver to simulate the behavior of SMA based filtering and flow regulating devices. Fluid flow through porous SMAs is also simulated and effective permeability and macroscopic mechanical properties of the porous media are computed numerically.

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