Influence of Strain Rate on Deformation Properties of TiNi Shape Memory Alloy

概要

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Tensile tests with loading and unloading under various strain rates ε^^・ were performed for TiNi shape memory alloy wires at various constant temperatures. The influence of strain rate on the stress-strain-temperature relationship was investigated. The main results are summarized as follows. ( 1 ) For ε^^・ < 10%/min, the martensitic transformation stress and its reverse transformation stress did not depend on ε^^・. These stresses were almost constant in the transformation regions. ( 2 ) For ε^^・ ≧ 10 %/min, the martensitic transformation stress increased and its reverse transformation stress decreased with an increase in ε^^・. These stresses fluctuated in the transformation regions. ( 3 ) The influence of ε^^・ on the transformation stress due to R-phase transfor-mation was slight. ( 4 ) The recoverable strain energy density depended slightly on ε^^・ but increased significantly in proportion to temperature. The dissipated strain energy density depended slightly on temperature but increased in proportion to ε^^・ for ε^^・ ≧ l %/min. ( 5 ) The influence of t on deformation properties is important in the evaluation of mechanical properties of shape memory alloy elements.
一般社団法人日本機械学会の論文
1996-01-15