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Proceedings Paper

Pseudoelasticity: experimental observations, thermomechanical modeling, and identification of the material parameters
Author(s): Dirk Helm
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Paper Abstract

In a certain temperature range, NiTi and other shape memory alloys show the so-called pseudoelastic effect. In the present study, the pseudoelasticity of NiTi is experimentally investigated in tension tests on thin-walled tubes. The observed phenomena are modeled within the framework of continuum thermomechanics regarding a geometric linear theory. The model is based on a free energy function in order to represent the occurring energy storage and release effects. Additionally, evolution equations for internal variables, like the inelastic strain tensor and the fraction of martensite, are introduced. The proposed system of constitutive equations represents the observed history-dependent material behavior. To identify the material parameters, the theory of neural networks is applied.

Paper Details

Date Published: 21 July 2004
PDF: 12 pages
Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); doi: 10.1117/12.539787
Show Author Affiliations
Dirk Helm, Univ. of Kassel (Germany)

Published in SPIE Proceedings Vol. 5387:
Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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