Abstract Crack propagation rates from isothermal and in-phase high temperature thermomechanical fatigue crack propagation tests for Inconel 792 resulted in a rather large scatter band when plotted against the linear-elastic stress intensity function Δ K. Previous observations indicated that the residual strains generated during the first few cycles in the uncracked specimen can explain, to a large extent, the differences between the tests. An effective Δ K eff was calculated for each test based on non-linear FE simulations. When the crack propagation rates for each test were plotted against the calculated Δ K eff , the curves collapsed to a smaller scatter band.

中文翻译：

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考虑初始塑性变形以预测 TMF 加载条件下的疲劳裂纹扩展

摘要 Inconel 792 的等温和同相高温热机械疲劳裂纹扩展试验的裂纹扩展速率在绘制线弹性应力强度函数 Δ K 时导致相当大的散射带。未开裂试样的前几个循环可以在很大程度上解释测试之间的差异。基于非线性有限元模拟计算每个测试的有效ΔK eff 。当针对计算出的 ΔK eff 绘制每个测试的裂纹扩展速率时，曲线收缩为较小的散射带。