Development of a microstructural cohesive zone model for intergranular hydrogen environmentally assisted cracking

During the initial stages of hydrogen environmentally assisted cracking (HEAC), including crack incubation, initiation and microstructurally short cracking, geometrical configuration microstructure greatly influences growth behaviour. Therefore, there is a big incentive to generate model which can replicate intergranular HEAC at microstructural scale. This report provides general framework implement by using cohesive zone approach in Abaqus. The parameters phenomenological were fitted in-situ synchrotron tomography observations propagation during AA7449-T7651. After fitting parameters, real behaviour aluminium alloy 7449-T7651 has been replicated accurately. Several characteristic features achieved, segmentation, preferential along grain boundaries with high resolved normal stress cracks slowing down boundary triple junctions. Comparisons experimental show suitability this for prognosis scale under conditions.