A numerical creep analysis on the interaction of twin semi-elliptical cracks

被引：24
|
作者：
Si, Jun [1 ]
Xuan, Fu-Zhen [1 ]
Tu, Shan-Tong [1 ]
机构：
[1] E China Univ Sci & Technol, Sch Mech Engn, Shanghai 200237, Peoples R China
来源：
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2008年 / 85卷 / 07期
关键词：
creep crack growth; surface flaw; C* integral; finite element analysis;
D O I：
10.1016/j.ijpvp.2008.02.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The interaction and coalescence of multiple flaws will significantly influence the service life of components. In this paper, the interaction of two identical semi-elliptical cracks in a finite thickness plate subjected to the remote tension is investigated. The results indicated that interaction of multiple cracks is different between the time-dependent fracture characterized by C-integral and linear elastic fracture noted by SIF. The magnifying factors of creep fracture are obviously larger than that of the linear elastic fracture cases. Therefore, the current interaction and coalescence rule developed from linear elastic fracture analysis may lead to a non-conservative result when it is used in the assessment of creep crack. At the end, an empirical equation is developed based on the numerical results. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：459 / 467
页数：9
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