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考虑形状比的焊趾裂纹扩展行为的数值仿真分析

余茜, 魏国前, 李山山, 陈斯雯

余茜, 魏国前, 李山山, 陈斯雯. 考虑形状比的焊趾裂纹扩展行为的数值仿真分析[J]. 焊接学报, 2019, 40(5): 107-112,125. DOI: 10.12073/j.hjxb.2019400136
引用本文: 余茜, 魏国前, 李山山, 陈斯雯. 考虑形状比的焊趾裂纹扩展行为的数值仿真分析[J]. 焊接学报, 2019, 40(5): 107-112,125. DOI: 10.12073/j.hjxb.2019400136
YU Xi, WEI Guoqian, LI Shanshan, CHEN Siwen. Numerical simulation analysis of crack propagation in weld toe considering aspect ratio[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(5): 107-112,125. DOI: 10.12073/j.hjxb.2019400136
Citation: YU Xi, WEI Guoqian, LI Shanshan, CHEN Siwen. Numerical simulation analysis of crack propagation in weld toe considering aspect ratio[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(5): 107-112,125. DOI: 10.12073/j.hjxb.2019400136

考虑形状比的焊趾裂纹扩展行为的数值仿真分析

基金项目: 国家自然科学基金资助项目(51575408)

Numerical simulation analysis of crack propagation in weld toe considering aspect ratio

  • 摘要: 针对焊趾处初始裂纹的不同形状比,基于NASGRO裂纹扩展速率模型对裂纹扩展过程进行了数值仿真. 以具有不同形状比的半椭圆表征焊趾表面裂纹,考虑短裂纹扩展阶段,采用M积分计算整个裂纹前沿的应力强度因子,并将裂纹前沿应力强度因子中值点作为裂纹扩展的主要控制参量,模拟并分析了不同形状比条件下裂纹前沿的形状演变和应力强度因子的分布及变化特点. 结果表明,随着裂纹的扩展,短裂纹阶段的不同形状比变化将趋于一致;短裂纹的形状比对早期裂纹扩展有较大影响,并最终导致整体疲劳寿命的显著差异性;综合初始形状比对裂纹前沿应力强度因子、扩展形状以及疲劳寿命的影响,可将其作用效果的强弱拐点作为界定短裂纹与长裂纹的有效参考. 开展了十字焊接接头疲劳验证试验,试验结果与仿真结果具有较好的一致性.
    Abstract: In terms of the different aspect ratio of initial crack in weld toe, the numerical simulation of crack propagation was carried out based on the NASGRO crack growth rate model. Semi-ellipsoid with different aspect ratio was used to characterize the surface crack of weld toe. Considering the short crack propagation stage, M integration was used to calculate the stress intensity factor of the whole crack front and the median value of crack front stress intensity factor was taken as the main control parameter for crack propagation. The shape evolution stress intensity factor distribution and change of crack front were simulated and analyzed under different aspect ratio. The results show that with propagation of the crack, the different shape of the short crack tend to be more consistent; The shapes of the short cracks have a greater influence on the early crack propagation and eventually lead to significant differences in the overall fatigue life; Based on the influence of the initial aspect ratio on the stress intensity factor, the extended shape, the fatigue life of the crack front, and the inflection point of its effect can be used as an effective reference to define the short crack and the long crack. The fatigue test of cross welded joint was carried out. The test results show good agreement with and simulation results.
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  • 期刊类型引用(2)

    1. 回丽,仉奕霏,周松,杨文军,安金岚. 高铁转向架焊接接头内部裂纹应力强度因子研究. 机械强度. 2024(06): 1449-1457 . 百度学术
    2. 范磊,商丽. 链板式连续运输机械中焊趾表面裂纹扩展形态检测. 电镀与精饰. 2023(11): 87-92 . 百度学术

    其他类型引用(5)

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出版历程
  • 收稿日期:  2017-12-12

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