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FLAW TOLERANCE ASSESSMENT FOR LOW-CYCLE FATIGUE OF STAINLESS STEEL

机译：不锈钢低周疲劳的容差评估

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摘要

According to Appendix L of the BPVC Section Ⅺ , flaw tolerance assessment is performed using the stress intensity factor even for low-cycle fatigue. On the other hand, in Section Ⅲ, the fatigue damage is assessed using the design fatigue curve, which has been determined from strain-based fatigue tests. Namely, the stress is used for the flaw tolerance assessment, whereas the strain (Ke factor) is quoted for the design. In order to resolve this inconsistency, in the present study, the strain intensity factor was used for crack growth prediction. First, it was shown that the strain range was the key parameter for predicting the fatigue life and crack growth. The crack growth rates correlated well with the strain intensity factor even for the low-cycle fatigue. Then, the strain intensity factor was applied to predict the crack growth under uniform and thermal cyclic loading conditions. The estimated fatigue life for the uniform cyclic loading condition agreed well with that obtained by the low-cycle fatigue tests, while the fatigue life estimated for the cyclic thermal loading condition was longer. It was shown that the inspection result of "no crack" can be reflected to determining the future inspection time by applying the flaw tolerance analysis. It was concluded that the flaw tolerance concept is applicable not only to the plant maintenance but also to plant design. The fatigue damage assessment using the design fatigue curve can be replaced with the crack growth prediction.
机译：根据BPVC部分Appendix的附录L，即使对于低周疲劳，也使用应力强度因子进行缺陷耐受性评估。另一方面，在Ⅲ节中，使用设计疲劳曲线评估了疲劳损伤，该曲线是根据基于应变的疲劳试验确定的。即，将应力用于缺陷耐受性评估，而在设计中引用了应变（Ke因子）。为了解决这种矛盾，在本研究中，将应变强度因子用于裂纹扩展预测。首先，表明应变范围是预测疲劳寿命和裂纹扩展的关键参数。即使对于低周疲劳，裂纹扩展速率与应变强度因子也具有很好的相关性。然后，使用应变强度因子来预测在均匀和热循环载荷条件下的裂纹扩展。均匀循环载荷条件下的疲劳寿命与低循环疲劳试验相吻合，而循环热载荷条件下的疲劳寿命则更长。结果表明，通过应用缺陷公差分析，可以将“无裂纹”的检查结果反映出来，以确定未来的检查时间。结论是，容错概念不仅适用于工厂维护，而且适用于工厂设计。使用设计疲劳曲线的疲劳损伤评估可以替换为裂纹增长预测。

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