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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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Modeling of effects of matrix on actuation characteristics of embedded shape memory alloy wires
CUI Xiao-long(崔晓龙)1, ZHENG Yan-jun(郑雁军)2, CUI Li-shan(崔立山)2

1. Technology Center, Shenzhen Fiyta Holdings LTD, Shenzhen 518057, China; 
2. Department of Materials Science and Engineering, University of Petroleum, 
Beijing 102249, China

Abstract: Effects of matrix properties on the actuation characteristics of embedded shape memory alloy wires were studied. The coefficient of thermal expansion and the modulus of matrix have significant effect on the maximum recovery stress. The thermal strain rate of the SMA wires upon heating is more sensitive to the matrix properties than the stress rate does. Additional fibers embedded in the matrix have significant effect on the stress distribution between the SMA wires and the matrix, and thus affect the interface quality significantly. Fibers with negative thermal expansion coefficient are beneficial to the interface between shape memory alloy wires and the epoxy matrix. All conclusions based on the numerical modeling can find experimental supports.

 

Key words:  shape memory alloys; composite; actuation; matrix

ISSN 1672-7029
CN 43-1423/U

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