焊趾裂纹前沿扩展的动态数值仿真分析

余茜; 魏国前; 胡政豪; 党章

doi:10.13433/j.cnki.1003-8728.2018.0715

焊趾裂纹前沿扩展的动态数值仿真分析

doi: 10.13433/j.cnki.1003-8728.2018.0715

余茜¹,
魏国前^1,2, ,,
胡政豪¹,
党章²

1.
武汉科技大学冶金装备及其控制教育部重点实验室, 武汉 430081;
2.
武汉科技大学机械传动与制造工程湖北省重点实验室, 武汉 430081

基金项目:

国家自然科学基金项目（51575408）资助

详细信息

作者简介:
余茜(1994-),硕士研究生,研究方向为焊接结构疲劳分析,13657118562@163.com

通讯作者:
魏国前,教授,硕士生导师,博士,weiguoqian@wust.edu.cn

计量
- 文章访问数: 198
- HTML全文浏览量: 31
- PDF下载量: 12
- 被引次数: 0
出版历程
- 收稿日期: 2017-08-05
- 刊出日期: 2018-07-05

Dynamic Numerical Simulation for Crack Front Propagation in Welding Toe

Yu Xi¹,
Wei Guoqian^{1,2
, ,},
Hu Zhenghao¹,
Dang Zhang²

1.
The Ministry of Education Key Laboratory of Metallurgical Equipment and Control Technology, Wuhan University of Science and Technology, Wuhan 430081, China;
2.
Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

摘要

摘要: 采用半圆形表征焊趾初始表面裂纹，以应力强度因子幅值作为裂纹扩展的驱动力，基于NASGRO裂纹扩展速率模型，考虑应力强度因子幅值门槛值和断裂韧性的影响，研究了整个裂纹前沿的动态演变过程。揭示了复杂焊趾形貌处初始裂纹的位置对裂纹扩展模式的影响规律，得出不同扩展模式下的疲劳寿命分布；分析了裂纹前沿应力强度因子的分布状况以及其在不同方向上的分布特点。开展了十字焊接接头的疲劳对比试验，试验结果与仿真结果具有较好的一致性。
- 应力强度因子 /
- NASGRO /
- 裂纹前沿演变 /
- 裂纹扩展寿命 /
- 数值仿真
Abstract: Based on the model for NASGRO crack propagation rate, considering the influence of the stress intensity factor amplitude threshold and the fracture toughness, the stress intensity factor amplitude was used as the driving force of the crack propagation to discuss the whole of the crack front dynamic evolution with the semi-circular shape as the initial surface crack. The influence of the position of the initial crack on the crack propagation mode was revealed, and the fatigue life distribution in different propagation modes was obtained; the distribution of stress intensity factor at the crack front and its distribution in different directions were analyzed. The fatigue comparative test of the cross welded joint was carried out, the results were in a good agreement with the simulated.
- stress intensity factor /
- NASGRO /
- crack front evolution /
- crack propagation life /
- numerical simulation

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参考文献(16)

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