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Modeling of Precipitation Effects on the Thermomechanical Behavior of NiTi SMA

[+] Author Affiliations
Yves Chemisky, Dimitri Lagoudas

Texas A&M University, College Station, TX

Boris Piotrowski

Arts et Metiers Paristech, Metz, France

Etienne Patoor

Arts et Metiers ParisTech, Metz, France

Tarak Ben-Zineb

Nancy University, Vandoeuvre-les-Nancy, France

Paper No. SMASIS2010-3779, pp. 245-251; 7 pages
doi:10.1115/SMASIS2010-3779
From:
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1
  • Philadelphia, Pennsylvania, USA, September 28–October 1, 2010
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-4415-1 | eISBN: 978-0-7918-3886-0
  • Copyright © 2010 by ASME

abstract

The effect of precipitation on Ni-rich NiTi Shape Memory Alloys on the thermomechanical properties is investigated. Particulary, the relation between the chemical evolution of the alloy and phase transformation characteristics are studied in order to evaluate the impact on the global mechanical response. The evolution of chemical composition of the alloy is computed using a diffusion law, according to the precipitates population characteristics. The mechanical response is simulated using a Representative Unit Cell which takes into account the structural effect of the precipitates as well as the effect of the composition change. The results show an important effect on the global mechanical behavior even for a small volume fraction of precipitates.

Copyright © 2010 by ASME

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