|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Mesoscale Modeling of the Influence of Microstructural Gradients on Fracture
||Gustavo Castelluccio, Hojun Lim, John Emery, Corbett Battaile
|On-Site Speaker (Planned)
Traditional fracture mechanics theories infer crack tip driving force (local field) by surveying macroscopic physical quantities away from the crack (far field). In the case of inhomogeneous or anisotropic materials, fracture mechanics singularity approaches are not fully theoretically sound and their application relies on extrapolating methodologies with ad-hoc modifications. This work employed mesoscale-sensitive finite element simulations to investigate the impact of grain size and texture on the crack tip behavior. A dislocation crystal plasticity model was used to convey grain size effects by computing the constraint on dislocation structures. We assessed the impact of microstructural variability of single phase metals considering various displacement-based measurements on the crack tip driving forces, and quantified the variability in opening and sliding modes. The results show that grain size and texture affect the resisting fracture toughness and can induce a Mode II deformation. Furthermore, driving force measurements present different sensitivity to microstructural effects.