文献类型：期刊文献

英文题名：Effect of martensite transformation on fracture behavior of shape memory alloy NiTi in a notched specimen

作者：Wang, G.Z.[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2007

卷号：146

期号：1-2

起止页码：93

外文期刊名：INTERNATIONAL JOURNAL OF FRACTURE

收录：;EI(收录号：20074710937782);WOS:【SCI-EXPANDED(收录号:WOS:000251682700007)】；

语种：英文

外文关键词：fracture; martensite transformation; shape memory alloy

摘要：In this paper, the finite element calculation of the stress-strain distribution in front of a notch tip were carried out for two materials. One is a shape memory alloy NiTi with the stress-induced martensite transformation, and another is a fully transformed martensite NiTi without the transformation. Based on the results obtained, and combining a model of the fracture process zone, effect of martensite transformation on the fracture behavior of the shape memory alloy NiTi in a notched specimen of plane stress state is comparably analyzed. The results show that the martensite transformation increases the load to produce plastic deformation in the transformed martensite at the notch tip and decreases the maximum normal stress and plastic strain near the notch tip, and tends to suspend the crack nucleation and propagation in the fully transformed martensite in front of the notch tip, and thus increases the fracture load and improves the toughness. A quantitative analysis based on the model of the fracture process zone shows that the martensite transformation in the SMA NiTi causes about 47% increase in the apparent fracture toughness.