Strain gradient plasticity beyond micron-scale applications: Fracture and damage modelization

Abstract eng:
In this work a general framework for damage and fracture assessment accounting for the role of geometrically necessary dislocations (GNDs) is provided. Crack tip fields are characterized, within both infinitesimal and finite deformation theories, by means of different strain gradient plasticity (SGP) formulations and their finite element implementation. Moreover, the impact of SGP theories on fracture and damage problems is further assessed by modelling several scenarios of particular interest: hydrogen diffusion towards the fracture process zone, environmentally assisted cracking, crack growth initiation and subsequent resistance and probabilistic-based cleavage fracture assessment. Results show a strong influence of GNDs, revealing the need to incorporate its influence in continuum models in order to adequately characterize behaviour at the small scales involved in crack tip deformation.

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