Peridynamic modelling of dynamic fracture and fatigue cracking

Abstract eng:
We discuss peridynamic formulations for dynamic brittle fracture problems and fatigue facture. In particular, we focus on dynamic fracture in Functionally Graded Materials (FGMs) where we show how the crack path is influenced by the dynamic loading conditions. Results compare well with those from experimental tests found in the literature. For fatigue cracking, we validate the peridynamic formulation for a modified compact tension test which leads to curved crack paths that sink in a hole or avoid it depending on the location of where the hole is placed. The model is then applied to simulate fatigue crack growth in a two-phase composite with multiple crack initiation points and cracks that interact in complex ways. We emphasize the role nonlocality plays in the peridynamic modelling of damage evolution.

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