Numerical Simulation of Brittle Crack Propagation Incorporating Toughness and Residual Stress Distribution in Welds

机译：脆弱裂纹繁殖的数值模拟，包括焊缝韧性和残余应力分布

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The present paper describes numerical simulation of brittle crack propagation and arrest in steel and welds. The model is based on the local fracture criterion and considers non-straightness of a crack front and irregularity of a crack surface. From static mixed mode stress intensity factors at a crack-tip, stress tensor is calculated, from which cleavage crack orientation is determined. By continuing this process, whole crack surface configuration is calculated. The model was applied to press-notched bend crack arrest tests. Calculated fracture surface morphologies agreed well with experimentally observed ones, including shear-lips, chevron patterns. Then, the model was applied to welds. It was demonstrated that crack propagation path changed, depending on toughness and residual stress distributions.

机译：本文介绍了钢材和焊缝脆性裂纹传播和停滞的数值模拟。该模型基于局部骨折标准，并考虑裂缝表面的裂缝前沿的非直线度和裂缝表面的不规则性。从静态混合模式应力强度因子处于裂缝尖端，计算应力张量，确定裂解裂缝取向。通过继续进行该过程，计算整个裂缝表面配置。该模型被应用于压制弯曲弯曲裂缝钝化试验。计算的骨折表面形态与实验观察的骨折相同，包括剪切嘴唇，雪佛龙图案。然后，将模型应用于焊接。据证明，裂缝繁殖路径根据韧性和残余应力分布而改变。

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《International Conference on Trends in Welding Research》|2016年|521p|共4页
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Tetsuya Namegawa; Hiroaki Nakai; Shuji Aihara;
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中图分类 TG4-532;
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1. Prediction of residual stress distributions due to surface machining and welding and crack growth simulation under residual stress distribution [J] . Ryohei Ihara, JInya Katsuyama, Kunio Onizawa, Nuclear Engineering and Design . 2011,第5期

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2. Limited weld residual stress measurements in fatigue crack propagation: Part II. FEM-based fatigue crack propagation with complete residual stress fields [J] . Sutton MA, Reynolds AP, Ge YZ, Fatigue & Fracture of Engineering Materials & Structures . 2006,第7期

机译：疲劳裂纹扩展中有限的焊接残余应力测量：第二部分。具有完整残余应力场的基于FEM的疲劳裂纹扩展
3. Effect of welding residual stresses on fracture toughness testing part 2: crack tip opening displacements in the residual stress field of multipass weldments of thick plates [J] . J. C. Suarez, Hidekazu Murakawa, Yukio Ueka Welding Research Abroad . 1999,第5期

机译：焊接残余应力对断裂韧性测试的影响第二部分：厚板多道次焊缝残余应力场中的裂纹尖端开口位移
4. Numerical Simulation of Brittle Crack Propagation Incorporating Toughness and Residual Stress Distribution in Welds [C] . Tetsuya Namegawa, Hiroaki Nakai, Shuji Aihara International Conference on Trends in Welding Research . 2016

机译：脆弱裂纹繁殖的数值模拟，包括焊缝韧性和残余应力分布
5. Numerical simulations of crack propagation driven by stress-assisted corrosion in brittle solids and composite materials. [D] . Tang, Zhibo. 2003

机译：应力辅助腐蚀在脆性固体和复合材料中驱动裂纹扩展的数值模拟。
6. Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment [O] . Jianfei Chen, Jingyu Chu, Wenchun Jiang, 2020

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7. Development of Three-Dimensional Crack Path Prediction Model for Brittle Fracture in Welded Joint with Residual Stress, Toughness Distribution and Various Types of Welding Groove [O] . Hiroaki Nakai, Hitoshi Yoshinari, Takehiro Inoue, 2014

机译：残余应力，韧性分布与各种焊接槽焊接接头脆性裂缝三维裂纹路径预测模型的研制
8. The Numerical Simulation of Crack Growth in Weld-Induced Residual Stress Fields [R] . Kanninen, M. F., Brust, F. W., Ahmad, J., 1981

机译：焊接残余应力场裂纹扩展的数值模拟

Numerical Simulation of Brittle Crack Propagation Incorporating Toughness and Residual Stress Distribution in Welds

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