Pseudoelasticity: experimental observations, thermomechanical modeling, and identification of the material parameters

Dirk Helm

doi:10.1117/12.539787

21 July 2004 Pseudoelasticity: experimental observations, thermomechanical modeling, and identification of the material parameters

Dirk Helm

Author Affiliations +

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.539787
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

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.

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Dirk Helm "Pseudoelasticity: experimental observations, thermomechanical modeling, and identification of the material parameters", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.539787

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