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Two-Dimensional Thermomechanical Model for Combined Loading of NiTi Wire Structures

[+] Author Affiliations
Petr Sedlák

Academy of Sciences of the Czech Republic; Czech Technical University in Prague, Prague, Czech Republic

Miroslav Frost

Academy of Sciences of the Czech Republic; Charles University in Prague, Prague, Czech Republic

Paper No. SMASIS2009-1284, pp. 101-109; 9 pages
  • ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • Volume 1: Active Materials, Mechanics and Behavior; Modeling, Simulation and Control
  • Oxnard, California, USA, September 21–23, 2009
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-4896-8 | eISBN: 978-0-7918-3857-0
  • Copyright © 2009 by ASME


Thin NiTi shape memory wires with unique thermomechanical properties are considered to be promising material for a wide range of new engineering applications. Based on broad experimental research on behavior of NiTi wires, which reveal a significant anisotropy in the transformation behaviors between tension and torsion, a new two-dimensional NiTi SMA material model was developed, particularly for the purpose of simulating NiTi wire structures behavior under combined mechanical and thermal loading. Two mutually perpendicular phase interfaces between autenite and martensite are formed during combined tension/torison loading. The first one, induced by tension, is perpendicular to symmetry axis, whereas the torsion-induced one is parallel to this axis. The model is parameterized by realistic physically-based material parameters and describes motion and evolution of these interfaces. Some numerical simulations — NiTi wire actuator, knitted self-expanding stent, shape memory fastener hook and shape memory helical spring — are presented and discussed to demonstrate the early practical applications of the model.

Copyright © 2009 by ASME



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