TiNi系SMAワイヤのひずみ変動下での変態伝播挙動

概要

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Propagation in a localized region of stress-induced phase transformation under strain variations in TiNi SMA is analyzed experimentally, by tension tests for wire and theoretically, by numerical simulation, FEM that is based on J2F theory. From the infrared thermograph during tension tests, it is found that a localized region of transformation appears near the end of the wire. The localized region of transformation propagates according to extension of the specimen, which gives rise to typical characteristics in the nominal stress-strain curve under strain variables of SMA wire (For example, the overshoots, the flat stress regions for reverse transformation and the nonlinear phenomena near the finishing points of transformation). Based on the constitutive assumptions of the softening type of the true stress-logarithmic strain curve, the simulated result exhibits the former typical behaviors associated with propagation of transformation. The validity of the constitutive assumptions and the mechanisms of the former behaviors are discussed by comparison of the experimental and the simulated results.
社団法人日本機械学会の論文
2004-01-25