Fatigue cracking in metallic sealing rings has been a concern for the aerospace industry because the formation of even a micro-crack may cause an aviation accident. In this study, an integrated three-point bending fatigue experiment and dislocation-based crystal plasticity finite element modeling was used to determine the threshold for fatigue crack nucleation. Subsequently, the fatigue lives of the rings under different service conditions were evaluated based on the local stored energy density evolution. The conclusions of this work can provide theoretical guidance for the manufacturing of high-performance metallic sealing rings.

中文翻译：

---

通过明确结合从制造到使用的变形历史，了解金属密封环中的疲劳裂纹成核

金属密封环的疲劳开裂一直是航空航天工业关注的问题，因为即使是微裂纹的形成也可能导致航空事故。在这项研究中，采用集成的三点弯曲疲劳实验和基于位错的晶体塑性有限元建模来确定疲劳裂纹形核的阈值。随后，基于局部存储能量密度演变评估了不同使用条件下环的疲劳寿命。本工作结论可为高性能金属密封圈的制造提供理论指导。