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Proceedings Paper

Fabrication, modeling, and characterization of porous shape memory alloys
Author(s): Dimitris C. Lagoudas; Pavlin B. Entchev; Eric L. Vandygriff
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Paper Abstract

This paper will present powder metallurgical methods for producing porous NiTi from elemental powders of 50at% Ni and 50at% Ti using a sintering approach in a high pressure environment. Different pore sizes and volume fractions of NiTi SMAs are fabricated and characterized in terms of composition and phase transformation characteristics using calorimetric measurements. Quasi-static and dynamic loading experiments are conducted on samples produced with the presented methodology and their shape recovery and energy absorption characteristics are measured during the forward and reverse phase transformation and detwinning. A micromechanical averaging method for modeling the behavior of porous SMAs is presented. Correlation of experimental results with theoretical predictions of the micromechanical method for the case of quasi-static loading is discussed.

Paper Details

Date Published: 11 July 2001
PDF: 10 pages
Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); doi: 10.1117/12.432750
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. 4333:
Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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