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Proceedings Paper

Effect of transformation induced plasticity on the mechanical behavior of porous SMAs
Author(s): Dimitris C. Lagoudas; Pavlin B. Entchev; Eric L. Vandygriff
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Paper Abstract

The fabrication of porous NiTi Shape Memory Alloy (SMA) from elemental Ni and Ti powders using Hot Isostatic Press (HIP) is presented in this work. Porous NiTi alloys with different porosity levels and different mechanical properties are obtained and analyzed. Their behavior under compressive mechanical loading is modeled using a micromechanical averaging model. The model treats the porous NiTi alloy as a two-phase composite: dense SMA matrix and pores. The behavior of the fully dense SMA matrix is modeled using a thermomechanical model with internal state variables. The development of transformation and plastic strains during the martensitic phase transformation is taken into account. The results from the model are compared with the experimental data.

Paper Details

Date Published: 11 July 2002
PDF: 11 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474979
Show Author Affiliations
Dimitris C. Lagoudas, Texas A&M Univ. (United States)
Pavlin B. Entchev, Texas A&M Univ. (United States)
Eric L. Vandygriff, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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