Abstract

An energy principles based model is developed for fatigue crack growth (FCG) prediction. According to the equilibrium relationship between released strain energy and irrecoverable stored energy accumulated along the length of fracture process zone (FPZ), the FCG rate is calculated through dividing the accumulated stored energy by the elementary fracture released energy in each load cycle. The elementary fracture released energy is determined from the cyclic strain energy release rate. The accumulated stored energy is obtained by integrating the crack-tip stresses within the FPZ length. Comparison between model prediction and FCG test data is made and good agreement is observed.

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