Abstract Fatigue crack growth rate in Room Temperature and Out-of-Phase Thermo-Mechanical Fatigue notched specimen experiments on the nickel-base alloy IN792 is studied. It is shown that it is possible to explain the observed higher crack growth rate in OP TMF compared to RT testing for the same external load, if plasticity induced crack closure is considered. Modeling utilizes node-release finite element simulations with a temperature dependent yield stress, resulting in different yield stress in tension and compression. It is shown that a simple extension of the analytical Newman crack closure equation can describe the opening level in the performed experiments.

中文翻译：

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异相热机械疲劳裂纹扩展和最小压缩载荷水平对缺口裂纹闭合的影响

摘要 研究了镍基合金IN792的室温疲劳裂纹扩展速率和异相热机械疲劳缺口试样实验。结果表明，如果考虑塑性诱导裂纹闭合，则可以解释在 OP TMF 中观察到的裂纹扩展速率高于相同外部载荷的 RT 测试。建模利用节点释放有限元模拟与温度相关的屈服应力，从而在拉伸和压缩中产生不同的屈服应力。结果表明，分析纽曼裂纹闭合方程的简单扩展可以描述所进行的实验中的开口水平。