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Developments in the use of creep crack initiation for design and performance assessment

机译：使用蠕变裂纹引发进行设计和性能评估的进展

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In large components such as rotors defects due to manufacturing processes have to be taken into account and crack assessments based on findings of non-destructive evaluation are necessary. Similar approaches are used in remaining life estimations. The Time Dependent Failure Assessment Diagram (TDFAD) approach is currently being developed within the R5 procedures as an alternative to conventional methods for predicting incubation and the early stages of creep crack growth. A similar Two Criteria Diagram approach has been developed independently in Germany to assess creep crack incubation in ferritic steels. Both approaches have been investigated in a study initiated by ECCC Working Group 1.2 "Creep Crack Initiation". Calculations and parameters used for the analysis such as reference stresses and fracture mechanics parameters have been compared for two materials, a ferritic 1CrMoV steel and an austenitic steel of type 316H.
机译：在大型部件（例如转子）中，必须考虑由于制造工艺引起的缺陷，并且必须基于无损评估的结果进行裂纹评估。剩余寿命估算中使用了类似的方法。 R5程序中目前正在开发基于时间的失效评估图（TDFAD）方法，以替代传统方法来预测孵化和蠕变裂纹扩展的早期阶段。在德国已经独立开发了类似的“两个标准图”方法来评估铁素体钢中的蠕变裂纹温育。由ECCC工作组1.2“ Creep Crack Initiation”发起的一项研究对这两种方法进行了研究。已对两种材料（一种铁素体1CrMoV钢和316H型奥氏体钢）的分析计算和分析参数（例如参考应力和断裂力学参数）进行了比较。

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