Abstract
ABSTRACTA methodology is proposed in this paper to compute local probability of fracture of a representative volume element from microstructural and fractographic information. A microscale approach is reported for cleavage fracture modelling of bainitic reactor pressure vessel steel. A fine metallographic and micro‐mechanical characterization has been performed. Morphological information has been used to generate realistic three‐dimensional (3D) aggregates and a suitable calibration process has been set up to identify an accurate crystal plasticity model for A508 bainitic steel. Simulation results have been successfully compared with macroscopic stress–strain curve. Taking benefits of a fine mechanical description of local stress and strain fields in aggregates, a post‐processing has been implemented to compute stress to failure values, for several realizations of an experimental carbides sizes distribution. A cumulative probability of fracture is proposed for this steel.
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