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Consideration on fatigue crack growth thresholds under negative stress ratio

Hasegawa, Kunio; Usami, Saburo*; Lacroix, V.*

Fatigue crack growth thresholds are provided by several fitness-for-service (FFS) codes. When evaluating cracked components subjected to cyclic loading, maximum stress intensity factor and/or minimum stress intensity factor are required. However, the definitions of the thresholds under negative stress ratio $$R$$ are not clearly written. In addition, the thresholds are given by constant values under negative $$R$$. This paper shows that the maximum stress intensity factor converted by the thresholds obtained by experimental data are not constant values under negative $$R$$. The thresholds for the FFS codes are less conservative. The definition of the thresholds under negative $$R$$ ratio are discussed.



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