TiNi形状記憶合金の回復ひずみ : 最大応力-定下での繰返し特性

概要

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The cyclic behavior of recovery strain under constant maximum stress in TiNi shape memory alloy is investigated experimentally. The influence of initial strain and the heating temperature in the thermal cycle on cyclic characteristics of recovery strain is discussed. The main results are summarized as follows. The amount of strain variation under the thermal cycle is significant for initial strain in the region of stress-induced martensitic transformation (SIMT), but is slight for initial strain before and after the SIMT. For maximum strain in the region of SIMT, the recovery strain varies during the thermal cycle. The variation of recovery strain is significiant in the early cycles. Recovery strain under the thermal cycle increases with the heating temperature, but the increasing rate of recovery strain decreases. For initial strain in the region of SIMT, strain at low temperature increases to the finishing strain of SIMT during the thermal cycle. The transformation temperatures at which strain decreases or increases during heating or cooling process become higher with the number of cycles.
一般社団法人日本機械学会の論文
1991-01-25