Modeling the evolution of fatigue failure with peridynamics
Keywords:fatigue crack, peridynamics, crack propagation, crack initiation, fatigue life, fracture
Holes and round notches are locations where fatigue cracks may arrest. Investigating the evolution of fatigue cracks after sinking into such a hole is important. Here we extend a recently proposed fatigue crack peridynamic model to treat such cases. The proposed improvements add the fatigue limit to the propagation phase. We demonstrate that the model simulates the three phases of fatigue failure (initiation, propagation, and final failure) with an example in which a fatigue crack sinks into a cutout and re-initiates from a different location along the cutout, grows, and lead to final failure of the structure. The fatigue crack path from the improved model agrees with an analysis based on strain concentrations. Convergence studies show that the peridynamic results are correct once the nonlocal size is smaller compared with the size of relevant geometrical features. We also discuss acceleration of computations on GPU-enabled hardware, obtained with minimal changes to a serial code.
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