Crack growth resistance of shape memory alloys by means of a cohesive zone model

被引：76
作者：
The Dreszer Fracture Mechanics Laboratory, Department of Solid Mechanics, Materials and Systems, The Fleischman Faculty of Engineering, 69978 Ramat Aviv, Israel [1 ]
机构：
[1] The Dreszer Fracture Mechanics Laboratory, Department of Solid Mechanics, Materials and Systems, The Fleischman Faculty of Engineering
来源：
J Mech Phys Solids | 2007年 / 10卷 / 2157-2180期
关键词：
Finite elements; Fracture mechanics; Numerical algorithms; Phase transformation; Shape memory alloys;
D O I：
10.1016/j.jmps.2007.03.002
中图分类号：
学科分类号：
摘要：
Crack growth resistance of shape memory alloys (SMAs) is dominated by the transformation zone in the vicinity of the crack tip. In this study, the transformation toughening behavior of a slowly propagating crack in an SMA under plane strain conditions and mode I deformation is numerically investigated. A small-scale transformation zone is assumed. A cohesive zone model is implemented to simulate crack growth within a finite element scheme. Resistance curves are obtained for a range of parameters that specify the cohesive traction-separation constitutive law. It is found that the choice of the cohesive strength t0 has a great influence on the toughening behavior of the material. Moreover, the reversibility of the transformation can significantly reduce the toughening of the alloy. The shape of the initial transformation zone, as well as that of a growing crack is determined. The effect of the Young's moduli ratio of the martensite and austenite phases is examined. © 2007 Elsevier Ltd. All rights reserved.
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页码：2157 / 2180
页数：23
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