Weight function for weld toe semi-elliptical surface crack and calculating residual stress intensity factors by weight function method

被引：0

作者：

Xü, Lei ^{[1
]}

Huang, Xiao-Ping ^{[1
]}

机构：

[1] State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai,200240, China

来源：

Chuan Bo Li Xue/Journal of Ship Mechanics | 2017年 / 21卷 / 04期

关键词：

Residual stresses - Stress analysis - Welds - Cracks - Finite element method - Aspect ratio - Surface defects;

D O I：

10.3969/j.issn.1007-7294.2017.04.009

中图分类号：

学科分类号：

摘要：

The stress intensity factors (SIFs) of semi-elliptical surface cracks at the weld toe were analyzed by using finite element analysis (FEA). Based on the obtained stress intensity factor data of surface cracks with aspect ratio from a/c=0.2~0.8 and a/t=0.1~0.8 by FEA, new weight functions for the calculation of T-butt weld toe surface cracks SIFs at both surface and deepest point were derived under constant and linear distributed stresses. The new weight functions were extended for higher order stress distribution situation and validated through the results obtained by FEA under parabolic and cubic stress loading. The difference between weight function and FEA is less than 10% for cracks with aspect ratio a/c=0.2~0.8, a/t=0.1~0.8 at both surface point and deepest point. The derived weight function is used to calculate the SIFs of weld toe surface crack due to residual stress, results comparison with FEA method shows new weight function can make good predication for the weld toe surface crack SIFs. © 2017, Editorial Board of Journal of Ship Mechanics. All right reserved.

引用

页码：443 / 454