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Basic Study of Electric Generation with Low Temperature Heat Source by Shape Memory Alloy(Thrmo-Mechanical Cyclic Properties and Lengthening of Fatigue Life)

形状记忆合金低温热源发电基础研究（热机械循环性能与疲劳寿命延长）

基本信息

批准号：
11650080
负责人：
OCHI Yasuo
金额：
$ 2.3万
依托单位：
University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

This research is aming to obtain the basic data for composition of the electric generation system with low temperature heat source by shape memory alloys (SMA). In the case of applying the SMA to the electric generation system, the SMA are used under the conditions of thermo - mechnaical cycling in combining with loading-unloading and heating - cooling. And, the functional and the mechanical properties change such as increase or decrease in the transformation temperature, the derfomation stress, the recovery stress and the strain energy and also, the degradations arise such as appearance of the irrecoverable strain and the two-way strain with thermo-mechanical cycling. It is very ipmortant to know the properties changes and the degradation chnaracteristics, and to make the lengthening of fatigue life of the SMA for appling the SMA to the electric generation system.In this research project, Ti-Ni-Cu type SMA wire specimens with several values of cold-working were used for the thermo-mec … More hanical cyclic tests by using the established thermo-mechnaical fatigue testing equipment.. And the effects of the cold-working on the functional and the fatigue properties of the SMA were investigated experimentally. The cold-working was one of the methods of lengthening of fatigue life, and the conditions of the cold-working ratio were 10〜40%. The results obtained were summarized as the followings.1. The deformation stress increased and the all kinds of transformation temperature decreased with increase in the cold-working ratio, and then, the recovery stress increased with the cold-waoking ratio.2. The available strain energy per cycle increased with increase in the cold-working ratio.3. The functional degradation arised in the martensitic phase, and the the degradated ratio was stabilized in the high cold-working ratio.4. As whole life of the thermo-mechanical cyclic fatigue became shorter with increase in the cold-working ratio, the total available strain energy obtained in the whole fatigue life decreased with increase in the cold-working ratio.5. The themo-mechanical fatigue life was evaluated by the disperted strain enrgy which was determined as the decrease in recovery strain energy per cycle. Less

本研究旨在为形状记忆合金低温热源发电系统的组成提供基础数据。在将形状记忆合金应用于发电系统的情况下，形状记忆合金在热机械循环条件下与加载-卸载和加热-冷却相结合使用。随着热机械循环的进行，材料的功能和力学性能发生了变化，如相变温度、变形应力、回复应力和应变能的升高或降低，并且出现了不可恢复应变和双向应变等退化现象。了解形状记忆合金（SMA）在发电系统中的性能变化和退化特性，提高SMA的疲劳寿命，是SMA在发电系统中应用的重要课题。本课题采用不同冷加工量的Ti-Ni-Cu型SMA丝材试件，对SMA丝材进行热机械性能试验，并对试验结果进行了分析。结果表明，SMA丝材的疲劳寿命随冷加工量的增加而增加，随着冷加工量的增加，SMA丝材的疲劳寿命逐渐降低，随着冷加工量的增加，SMA丝材的疲劳寿命逐渐降低 ...更多信息利用已建立的热机械疲劳试验设备进行了机械循环试验。并通过实验研究了冷加工对SMA的功能和疲劳性能的影响。冷加工是提高疲劳寿命的方法之一，冷加工率的条件为10 ~ 40%。所获得的结果总结如下.随着冷加工率的增加，变形应力增加，各相变温度降低，回复应力随冷加工率的增加而增加.随着冷加工率的增加，每循环的有效应变能增加.马氏体相发生功能降解，在高冷加工比下降解率稳定。4.随着冷加工比的增加，热机械循环疲劳全寿命变短，在整个疲劳寿命内获得的总有效应变能也随着冷加工比的增加而减小.热机械疲劳寿命是通过分散应变能来评估的，分散应变能被确定为每个循环的恢复应变能的减少。少

项目成果

期刊论文数量（27）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

佐久間俊雄,岩田宇一,高久啓,仮屋房亮,越智保雄,松村隆: "熱・力学的繰返し条件下におけるTi-Ni-Cu形状記憶合金の疲労寿命"日本機械学会論文集(A編). 66. 748-754 (2000)

Toshio Sakuma、Uichi Iwata、Kei Takahisa、Ryo Kariyafusa、Yasuo Ochi、Takashi Matsumura：“Ti-Ni-Cu 形状记忆合金在循环热和机械条件下的疲劳寿命”日本机械工程师学会会议记录（编辑 A） . 66. 748-754 (2000)