Numerical analysis of the creep crack constraint effects and the creep crack initiation for pressurized pipelines with circumferential surface cracks

被引：12
作者：
Wu, Dongquan [1 ,2 ]
Jing, Hongyang [1 ,2 ]
Xu, Lianyong [1 ,2 ]
Zhao, Lei [1 ,2 ]
Han, Yongdian [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[2] Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
来源：
ADVANCES IN ENGINEERING SOFTWARE | 2018年 / 115卷
基金：
中国国家自然科学基金;
关键词：
Load-independent constraint; Pipeline; Circumferential surface crack; Damage; Creep crack initiation; STEEL WELDED-JOINT; COMPACT TENSION SPECIMENS; 316H STAINLESS-STEEL; OF-PLANE CONSTRAINT; GROWTH-BEHAVIOR; TIP CONSTRAINT; FRACTURE; PARAMETER; INPLANE; P92;
D O I：
10.1016/j.advengsoft.2017.08.013
中图分类号：
TP39 [计算机的应用];
学科分类号：
081203 ; 0835 ;
摘要：
The creep crack constraint effects using a load-independent creep constraint parameter Q* and the creep crack initiation (CCI) times were characterized by 3D finite element method for pipelines with circumferential surface cracks of different geometrical sizes. The results revealed that the distribution regulation of Q* along the crack front for circumferential internal surface cracks and external surface cracks was similar. The maximum constraint level occurred near the deepest crack front part for cracks with smaller a/c, while it occurred near the free surface for cracks with larger a/c. The constraint values at the same position (2 Phi/pi) increased with the increasing of the crack depth when a/c kept constant. The circumferential internal surface cracks of pipelines were proved more dangerous than the external surface cracks with the same geometrical size. Furthermore, the CCI times were decided by the peak values of constraint, or the CCI firstly occurred at the position where the constraint level was maximum. In addition, the empirical relationships between the CCI times and crack sizes were fitted, which was also verified effectively. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：40 / 51
页数：12
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