2D weight function for stress intensity factor of semi-elliptical surface cracks with high aspect ratio

被引：0
|
作者：
Yuan K.-L. [1 ]
Jiang Y. [1 ]
Zhao F. [1 ]
Hong M. [1 ]
机构：
[1] State Key Lab of Structural Analysis for Industrial Equipment, School of Naval Architecture Engineering, Dalian University of Technology, Dalian
来源：
Chuan Bo Li Xue/Journal of Ship Mechanics | 2020年 / 24卷 / 11期
关键词：
2D weight function; High aspect ratio; Stress intensity factor (sif); Surface crack; Two-dimensional stress fields;
D O I：
10.3969/j.issn.1007-7294.2020.11.009
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The weight function method is a powerful tool for calculating stress intensity factor (SIF) of surface cracks under complex stress field. In this paper, the generalized expression of 2D weight function for semi-elliptical surface cracks with high aspect ratio was studied. Three-dimensional finite element analysis was performed to calculate the SIFs for surface cracks in finite-thickness plates over the range of aspect ratio 1 ≤ a/c ≤ 8 and crack depth-to-thickness ratio 0.01 ≤ a/T ≤ 0.8. The unknown parameters in general form were determined from the SIF reference solutions, and then 2D weight function for both surface and deepest point of high-aspect-ratio surface cracks was obtained. The accuracy of the new weight function was validated by several two-dimensional stress distributions, the difference between the SIFs calculated by weight function and FEM is less than 10%. The present results complement the 2D weight function previously developed by the authors with a wider application range of 0.05 ≤ a/c ≤ 8, 0.01 ≤ a/T ≤ 0.8. © 2020, Editorial Board of Journal of Ship Mechanics. All right reserved.
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收藏
页码：1453 / 1461
页数：8
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