Effect of three dimensional stress state on unstable fracture condition and crack opening level in a new crack growth model

Fang WANG and Weicheng CUI China Ship Scientific Research Center,Wuxi 214082,China

摘 要：A new model for the analysis of fatigue crack growth in the metal structures was proposed.This model shows a promising capability of explaining various fatigue phenomena.The new crack growth model is further completed by a continuous empirical formula for estimating the value of variable fracture toughness during crack propagation and a modified continuous equation for the crack tip stress/strain constraint factor used to calculate the stress intensity factor at the opening level.The prediction results are proved to agree well with the observed phenomena in test.

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