Crack tip microplasticity mediated by microstructure gradients

Traditional fracture theories infer damage at cracks (local field) by surveying loading conditions away from (far field). This approach has been successful in predicting ductile fracture, but it normally assumes isotropic and homogeneous materials. However, myriads of manufacturing procedures induce heterogeneous microstructural gradients that can affect the accuracy traditional models. work presents a microstructure-sensitive finite element to explore shielding effects grain size crystallographic orientation on crack tip microplasticity blunting. A dislocation density-based crystal plasticity model conveys texture evolution, effects, directional hardening computing constraint structures. The results demonstrate microstructure act as buffer between local far fields affects variability. For nominal opening loading, ductility non-negligible multiaxial plastic deformation. Furthermore, driving forces based measuring displacements are less affected microstructure, which suggests experimental methods smear out important