A cohesive XFEM model for simulating fatigue crack growth under various load conditions
R. Dekker, F.P. van der Meer, Johan Maljaars, L.J. Sluys
Abstract
This study presents calibration and validation of a cohesive extended finite element model for fatigue crack propagation in ductile materials. The approach relies on a separation between plasticity around the crack tip and fatigue crack growth at the crack tip such that the influence of plasticity on fatigue driving forces is predicted. This implies that characterization of crack growth requires effective Paris parameters. It is shown that the calibrated model can capture fatigue crack growth behaviour in ductile materials for in-phase and out-of-phase biaxial fatigue loading as well as in-phase biaxial loading with an overload.
Topics & Concepts
Materials scienceParis' lawPlasticityCrack closureFinite element methodStructural engineeringFatigue testingExtended finite element methodCrack growth resistance curvePhase (matter)Cohesive zone modelFracture mechanicsComposite materialEngineeringOrganic chemistryChemistryFatigue and fracture mechanicsNumerical methods in engineeringMechanical stress and fatigue analysis