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Integral formula of two parameter fatigue crack growth model

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Document pages: 12 pages

Abstract: An integral two parameter fatigue crack propagation algorithm is proposed, which can describe the continuous crack propagation process in a period of time. In this model, the fatigue crack growth behavior is controlled by the time crack tip state, including the current applied load and the physical conditions generated by the previous load sequence. The plastic induced crack closure left by the historical loading sequence controls the following fatigue crack growth behavior and usually leads to interaction effects. In the proposed method, a modified crack closure model derived from local plastic deformation is used to explain the load memory effect. Generally, the model can simulate fatigue crack growth under variable amplitude load. In addition, the models established on the physical state of crack tip in the small spatial and temporal scale, and it is used to evaluate the macroscopic crack propagation and fatigue life under irregular tension-tension loading. A special superimposed loading case is discussed to demonstrate the advantage of the proposed model, while the traditional two-parameter approach is not proper functional. Moreover, the typical various load spectra are also employed to validate the method. Good agreements are observed.

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