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J. Ocean Eng. Technol. 1995;9(1):101-110.    

The Effect of Pre-strain on Cyclic Deformation Characteristic of Ti-Ni Alloy
Ti-Ni합금의 반복변형특성에 미치는 pre-strain의 효과
박영철,조용배,허선철
동아대학교 기계공학과,동아공고 기계과,동아대 기계과
© 1995 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Shape Memory Alloy, Shape Memory Effect, Martensite Transformation, Cyclic Deformation, Degradation
핵심용어: 형상기억합금, 형상기억효과, 마르텐사이트 변태, 반복변형, 열화
Abstract
In SMA(Shape Memory Alloy), the degradation by fatigue is one of the most important problems to be overcome, when SMA is used for robot-actuator materials. The actuator is operated repetitively for long time and its repeating operation develops the fatigue degradation of SMA. The fatigue degradation changes the transformation temperature and deformation behavior and results in inaccurate operation and deformation which results form repeating operation is to be investigated in advance and the scheme to resolve those problems have to be made for the design of actuator. In this paper, for the improvement of the fatigue degradation by repetive movement and better control of the correct movement by the stability of martensite transformation in the development of Robots actuator, Pre-strain(0, 1.5, 5, 8%) are loaded in the specimens and fatigue testing were carried out by the method of heating and cooling in direct condition. From the results of these experiments, the effect on pre-strain which affect the transformation characteristic and fatigue degradation phenomena were correctly investigated.


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