Calculation of Dynamic Stress Intensity Factors Based on XFEM Model

被引：1
|
作者：
Wang B. [1 ]
Li Y. [1 ,2 ]
Liao Y. [3 ]
Li J. [1 ]
机构：
[1] College of Mechanical and Electrical Engineering, Central South University, Changsha
[2] State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha
[3] Light Alloy Research Institute, Central South University, Changsha
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2019年 / 30卷 / 11期
关键词：
Extended finite element method(XFEM); Interaction integral method; Mesh density factor; Relative integral radius; Stress intensity factor;
D O I：
10.3969/j.issn.1004-132X.2019.11.005
中图分类号：
学科分类号：
摘要：
In order to accurately calculate the stress intensity factors in the crack propagation model based on XFEM, the XFEM model of central crack plate and three-point bending were established in ABAQUS software. The stress intensity factors in the crack propagation processes were realized under mode Ⅰ and Ⅱ fracture modes respectively by using interactive integration method and user subroutine interface. The influences of mesh density and integral radius on the accuracy of stress intensity factor calculation for XFEM were studied. The research results show that when the mesh density factor is as 0.012~0.016 and the relative integral radius is as 3, the stress intensity factors converge to a stable value and the calculation errors are less than 3%. The dynamic stress intensity factors of fatigue crack growth specimens with single side hole were calculated by using the proposed method and programs. The testing results show that the errors between the residual life predicted by Paris theory and the fatigue test results are as 5.3%, which further verifies the correctness of the proposed method and programs. © 2019, China Mechanical Engineering Magazine Office. All right reserved.
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页码：1294 / 1301
页数：7
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