Effects of crack depth and specimen size on ductile crack growth of SENT and SENB specimens for fracture mechanics evaluation of pipeline steels

被引：57
|
作者：
Xu, J. [1 ,3 ]
Zhang, Z. L. [1 ]
Ostby, E. [2 ]
Nyhus, B. [2 ]
Sun, D. B. [3 ]
机构：
[1] Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway
[2] SINTEF, N-7465 Trondheim, Norway
[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2009年 / 86卷 / 12期
关键词：
Crack tip constraint; Ductile fracture; Crack growth resistance; The complete Gurson model; Size effect; ELASTIC-PLASTIC FRACTURE; TIP STRESS-FIELDS; 2-PARAMETER CHARACTERIZATION; NUMERICAL SIMULATIONS; TRIAXIALITY PARAMETER; CONSTRAINT; TOUGHNESS; MISMATCH; MODELS; ALGORITHMS;
D O I：
10.1016/j.ijpvp.2009.12.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A strong geometry dependence of ductile crack growth resistance emerges under large scale yielding. The geometry dependence is associated with different levels of crack tip constraint conditions. However, in a recent attempt to identify appropriate fracture mechanics specimens for pipeline steels, an "independent" relationship between the crack growth resistance curves and crack depths for SENT specimens has been observed experimentally. In this paper, we use the complete Gurson model to study the effects of crack depth and specimen size on ductile crack growth behavior. Crack growth resistance curves for plane strain, mode I crack growth under large scale yielding conditions have been computed. SENB and SENT specimens with three different specimen sizes, each specimen size with three different crack depths, have been selected. It has been found that crack tip constraint (Q-parameter) has a weak dependence on the crack depth for specimens in the low constraint regime. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：787 / 797
页数：11
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