Investigation of Deformation Inhomogeneity and Low-Cycle Fatigue of a Polycrystalline Material

Considering the relationship between inhomogeneous plastic deformation and fatigue damage, inhomogeneity evolution failure of superalloy GH4169 under temperature 500 °C macro tension compression cyclic loading are studied, by using crystal plasticity calculation associated with polycrystalline representative Voronoi volume element (RVE). Different statistical standard deviation differential entropy meso strain used to measure deformation, cycle is explored numerical simulation. It found from research that deviations each component tensor at peak increase monotonically loading, they similar other. The also increases number cycles, law similar. On this basis, critical values determined components equivalent strain, components, are, respectively, as criteria, then predict fatigue–life curves material. predictions verified reference measured results, their proved be in a reasonable range.