1902 形状記憶合金の引張-圧縮挙動解析モデル(S17-1 形状記憶合金の特性と応用化技術(1),S17 形状記憶合金の特性と応用化技術)

概要

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A simple yet accurate model of shape memory alloys (SMAs) is proposed, which can consider asymmetric tension-compression behavior. Features of this model are (1) energy-based transformation criterion, (2) partial transformation rule based on a micromechanical viewpoint, (3) required transformation energy in the form of a sum of two exponential functions in terms of phase volume fraction, and (4) energy balance equation including thermoelastic effect and dissipated energy due to interaction between the phases. In this model, three phases are considered, namely, an austenitic phase, a tensile stress induced martensitic phase, and a compressive stress induced martensitic phase. A result shows that the proposed model can well capture the asymmetric stress-strain loops for tension and compression and effects of strain rate. This indicates that this model would be a useful tool for understanding the mechanism of SMA behavior and designing smart structures with SMA elements.
一般社団法人日本機械学会の論文
2005-09-18