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Finite element computation of fatigue growth rates for mode I cracks subjected to welding residual stresses

机译：I型裂纹在焊接残余应力作用下疲劳增长率的有限元计算

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摘要

This paper presents a finite element modeling procedure for predicting fatigue crack growth rate in butt welds subject to mode I loading condition. Sequentially coupled three-dimensional thermal-mechanical finite element model to simulate welding residual stress was first developed. The weld-induced residual stress effect on the fatigue crack growth rate was then modeled by calculating the stress intensity factor due to the residual stress field based on the superposition rule of the linear elastic fracture mechanics. The results demonstrated the significance of the residual stresses in assessment of the fatigue crack growth rate in the welds.
机译：本文提出了一种有限元建模程序，用于预测在I型载荷条件下对接焊缝的疲劳裂纹扩展速率。首先建立了顺序耦合的三维热力有限元模型来模拟焊接残余应力。然后，基于线性弹性断裂力学的叠加规则，通过计算残余应力场引起的应力强度因子，来模拟焊接引起的残余应力对疲劳裂纹扩展速率的影响。结果证明了残余应力在评估焊缝疲劳裂纹扩展率方面的重要性。

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