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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.47  No.3 (2006)  >  pp.766-771

MATERIALS TRANSACTIONS
<<Previous article Vol.47  No.3 (2006)   pp.766 - 771 Next article>>

Local Strain Distribution Arising in Shape Memory Alloy Composite Subjected to Thermal Loading

Go Murasawa1) and Satoru Yoneyama2)
1) Department of Mechanical Engineering, Yamagata University
2) Department of Mechanical Systems Engineering, Osaka Prefecture University


The main purpose of the present research is the measurement of local strain distributions generated in a shape memory alloy composite (SMAC) under thermal loading. In the present study, firstly, the test system is constructed on the basis of Digital Image Correlation (D.I.C.) in order to measure local strains all over the surface of object. Then, local strain distributions generated in SMAC are measured under heating. Results in present study are as follows: (1) Longitudinal local strain reveals inhomogeneous deformation behavior during austenite transformation of SMA fiber, and shows distribution along to x and y direction after austenite transformation. Also, we can see that the state of distribution is different between x and y directions after austenite transformation. (2) Lateral local strain begins to generate around fiber during austenite transformation of SMA, and shows distribution along to only y direction after austenite transformation. This distribution is caused by thermal expansion of matrix. (3) Shearing local strain begins to generate at fiber edge during austenite transformation of SMA fiber, and shows distribution along to x and y direction after austenite transformation.


Keyword:
NiTi, epoxy, composite, internal stress, deformation, local strain, measurement, distribution, digital image correlation

Received: August 29, 2005
Accepted: January 31, 2006 , Published online: April 14, 2006
Copyright (c) 2006 The Japan Institute of Metals

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