Abstract A model to predict fatigue crack growth (FCG) for small-scale yielding (SSY) and non-SSY conditions where J -integral applies is established. The Δ J -characterized elastic-plastic fracture mechanics (EPFM) analysis is performed based on a rearranged FCG process to achieve the crack-tip geometry and stress state. The root stress of blunted crack and the FCG rate are calculated from the cycle-wise local and global energy balance. To consider effects of geometry, load level and strain hardening, a correction factor is further developed in the governing equation of global energy balance. The model is validated using the test data of several types of metals.

中文翻译：

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小规模屈服 (SSY) 和非 SSY 条件下的疲劳裂纹扩展预测

摘要 建立了在J-积分适用的小规模屈服(SSY)和非SSY条件下预测疲劳裂纹扩展(FCG)的模型。ΔJ 表征的弹塑性断裂力学 (EPFM) 分析是基于重新排列的 FCG 过程进行的，以实现裂纹尖端的几何形状和应力状态。钝化裂纹的根部应力和 FCG 率是根据循环局部和全局能量平衡计算的。为了考虑几何形状、载荷水平和应变硬化的影响，在全局能量平衡的控制方程中进一步开发了一个校正因子。该模型使用多种金属的测试数据进行验证。