S0303-1-5 結晶有限要素法による形状記憶合金の変形・変態挙動解析(形状記憶合金の特性と応用展開(1))

概要

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Deformation behavior of polycrystalline shape memory alloys is governed by the transformation behavior of martensite variants. In order to simulate complicated macroscopic thermomechanical behavior of the alloy, it is not sufficient to assume the macroscopic transformation strain to be proportional to the volume fraction of martensite. In this study, a material model based on the crystal-plasticity finite element method is proposed. Martensite variant is assumed to be activated when the work done by the transformation reaches a critical value. The change in a stress filed due to the transformation strain of active variants causes other variants to be activated. This allows the model to simulate an interaction effect of martensite variants. The stress-strain-temperature response is simulated by the proposed model to show the pseudoelasticity and shape memory effect.
2009-09-12