Applicability of the Improved Crack Growth Rate Model and Its Parameters Estimation Method

The crack growth rate curve is the basic fatigue property in any fatigue life prediction method based on fatigue crack propagation(FCP) theory.The authors have developed an improved crack growth rate model,which could explain more fatigue phenomena observed in fatigue tests.And the methods to estimate the model parameters from other test data rather than crack propagation tests have been introduced for engineering application.In this paper,the applicability of the improved crack growth rate model and its parameters estimation methods on HTS-A steel under constant amplitude load is analyzed,which will provide the basis for the future's application of this model to predict the fatigue life of marine structures made of such a type of high tensile steels.