日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 596-603

Influence of Cyclic Loading on Inhomogeneous Deformation Behavior Arising in NiTi Shape Memory Alloy Plate

Go Murasawa1, Satoru Yoneyama2, Toshio Sakuma3 and Masahisa Takashi4

1Department of Mechanical Engineering, Yamagata University, Yonezawa 992-8510
2Department of Mechanical Engineering, Osaka Prefecture University, Sakai 599-8531
3Materials Science Department, Komae Research Laboratory, Central Research Institute of Electric Power Industry, Komae 201-8511
4Department of Mechanical Engineering, Aoyama Gakuin University, Fuchinobe 229-8558

Abstract:

Many problems have existed in usage of shape memory alloy (SMA) such as the appearance of unexpected deformation behavior under complicated thermo-mechanical loadings. Inhomogeneous deformation behavior of SMA is one of the causes in those problems. The aim of the present paper is the investigation of inhomogeneous deformation behavior arising in SMA during cyclic loading. Firstly, a test system measuring inhomogeneous deformation behavior was constructed on the basis of Digital Image Correlation (DIC). Secondary, measurements of inhomogeneous deformation behavior (local strain distribution) arising in 50.5Ni49.5Ti plates were conducted during cyclic tensile loading-unloading at the temperature region of pseudoelasticity. It was seen that inhomogeneous deformation behavior sensitively changed according to state of loading (i.e., number of cycle, history of loading and so on). Also, macroscopic deformation behavior was strongly affected by inhomogeneous deformation behavior. It is very important for application of SMA to investigate the relationship between macroscopic deformation behavior and inhomogeneous deformation behavior.


(Received 2005/2/22)

Keywords:

NiTi shape memory alloy, pseudoelasticity, inhomogeneous deformation behavior, local strain, cyclic loading, digital image correlation


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