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Proceedings Paper

Strain-rate effects on TiNi and TiNiCu shape memory alloys
Author(s): Hiroyuki Nakayama; Ying Zhao; Minoru Taya; Weinong W. Chen; Yuta Urushiyama; Shunji Suzuki
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Paper Abstract

Dynamic deformation behavior of TiNi (superelastic grade) and TiNiCu alloy (shape memory grade) were examined using Split Hopkinson Pressure Bar. The stress-strain curves of the TiNi alloy exibits strain rate sensitivity. The flow stress in the plateau region increased with increasing of strain rate logarithmically, and the on-set stress for stress induced martensite also increased slightly. In contrast, the stress-strain curve of the TiNiCu alloy was found to be much less sensitive to strain rate. TEM observations revealed that the microstructure of the dynamically deformed TiNi is similar to that of the sample before dynamic deformation. In contrast, the dynamically deformed TiNiCu has a fine twinned structure than the sample deformed statically. Analytical constitutive equation for the dynamic deformed TiNi alloy was proposed by addition of the terms concerning the strain rate effect and temperature change due to adiabatic deformation and latent heat of martensitic transformation, the revised constitutive equation was in a good agreement with the experimental results.

Paper Details

Date Published: 16 May 2005
PDF: 9 pages
Proc. SPIE 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics, (16 May 2005); doi: 10.1117/12.600084
Show Author Affiliations
Hiroyuki Nakayama, Univ. of Washington (United States)
Ying Zhao, Univ. of Washington (United States)
Minoru Taya, Univ. of Washington (United States)
Weinong W. Chen, Univ. of Arizona (United States)
Yuta Urushiyama, Honda R&D (Japan)
Shunji Suzuki, Honda R&D (Japan)

Published in SPIE Proceedings Vol. 5761:
Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics
William D. Armstrong, Editor(s)

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