Fracture toughening mechanism of shape memory alloys due to martensite transformation

被引：78
|
作者：
Yi, S [1 ]
Gao, S [1 ]
机构：
[1] Nanyang Technol Univ, Sch Mech & Prod Engn, Singapore 639798, Singapore
来源：
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES | 2000年 / 37卷 / 38期
关键词：
shape memory alloys; fracture toughening mechanism;
D O I：
10.1016/S0020-7683(99)00213-9
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The fracture toughening mechanism of shape memory alloys is studied analytically. The asymptotic stress analysis of shape memory alloys under mode I loads is carried out using the Eshelby inclusion method and the weight function method. The toughening mechanism due to martensite transformation of shape memory alloys is investigated on the basis of the crack shielding theory of fracture mechanics. The transformation boundaries for static and steady advanced cracks are also determined. The analytic results show that the martensite transformation reduces the crack tip stress intensity factor and increases the toughness. The toughness of shape memory alloys is enhanced by the transformed strain fields which tend to limit or prevent crack opening and advancing. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：5315 / 5327
页数：13
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