TiNi形状記憶合金線材の曲げ疲労寿命に対するひずみ比の影響

概要

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A fatigue-test machine for alternating bending under strain-controlled conditions was developed. Bending-fatigue tests for various strain ratios were then performed. The results obtained can be summarized as follows. (1) The fatigue life curves under alternating bending and pulsating bending, as expressed by the relationship between maximum strain and the number of cycles to failure, systematically follow the order of strain ratio. (2) The larger the strain ratio, the longer the fatigue life. (3) The fatigue life under rotating bending is shorter than that under alternating bending. (4) The increase in temperature during cyclic bending becomes larger in the order: rotating bending, alternating bending, pulsating bending. The fatigue life decreases in proportion to the increase in temperature. (5) The fatigue limit of strain for alternating bending, pulsating bending and rotating bending is in the region of R-phase transformation.
一般社団法人日本機械学会の論文
2003-07-25