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Evaluation of Degrading Characteristics of Ti-Ni Shape Memory Alloy under Combined Cyclic Condition of Load, Displacement and Temperature

载荷、位移和温度联合循环条件下钛镍形状记忆合金的退化特性评价

基本信息

批准号：
63460075
负责人：
TANAKA Tsuneshichi
金额：
$ 2.75万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

The aim of this Study, conducted during two years of 1988 and 1989, is to evaluate the cyclic degrading characteristics of Ni-Ti shape memory alloy under combined cyclic conditions of load, displacement and temperature. In the first year of 1988, an experimental system was developed to investigate the material performance of the Ni-Ti shape memory alloy.And then, by using this testing system, degrading processes in low cycles range were studied precisely on two phases; one was shape memory effect and another was superelasticity. In the second year of 1989, degrading tests in long life range up to 10000 cycles were conducted systematically by adopting resistance-heating procedure, which enable us to conduct thermal cycle tests with period of about 20 sec.Major conclusions obtained through 2 year investigation can be summarized as follows:(1) It was confirmed that the level of performance of the experimental system used in this study to evaluate the.degrading processes of shape memory alloy-was high. (2) Heat-treatment condition to control the shape memory effect predominantly influenced the martensite transformation temperature, and the lower was the heat-treatment temperature the higher was the load level to induce the martensite transformation. (3) Shape memory effect and superelasticity could be kept during long term range when heat-treated at low temperature.

本研究的目的是在1988年和1989年的两年期间，在载荷、位移和温度的组合循环条件下评估Ni-Ti形状记忆合金的循环退化特性。1988年1月，我们研制了一套Ni-Ti形状记忆合金材料性能的试验系统，并利用该试验系统对Ni-Ti形状记忆合金在低周疲劳下的两个阶段即形状记忆效应阶段和超弹性阶段的退化过程进行了精确的研究。1989年的第二年，我们采用电阻加热法，系统地进行了长达10000次循环的长寿命退化试验，使我们能够进行周期约为20秒的热循环试验。经过两年的研究，得到的主要结论如下：（1）证实了本研究所用的评价形状记忆合金退化过程的实验系统的性能水平是高的。(2)控制形状记忆效应的热处理条件主要影响马氏体相变温度，热处理温度越低，诱发马氏体相变的载荷水平越高。(3)低温热处理可使合金在较长时间内保持形状记忆效应和超弹性。