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Modelling Of IGSCC With Adaptive Framework

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Intergranular Stress Corrosion Cracking (IG-SCC) plays an important role as one of the most recognized degradation phenomena in Nuclear Power Plants (NPP). SCC is both multi-disciplinary with many parameters that are dependent on each other. This study was based on developing a multi-physics finite element model for IG-SCC prediction in unirradiated structural materials for non-pressure vessel components in NPPs. The environment considered was boiling water reactor (BWR) with normal water chemistry (NWC), containing approx. 200ppb oxidant (O2 + H2O2) and varying aggressive ions Cl-. The model was focused on the slip-oxidation model, where a crack is advancing by anodic dissolution, passivation, and oxide rupture at the crack tip. The rupture of the oxide film is due to the constant stresses applied creating slips in the bulk material which fractures the oxide.

Product Number: ED22-17225-SG
Author: Michal Sedlak Mosesson, Pål Efsing
Publication Date: 2022
$20.00
$20.00
$20.00

A finite element model was proposed for intergranular stress corrosion cracking modelling. The model is based around a moving integration point formulation which enables the model to track the oxide, dissolution, and crack tip. The formulation is introduced in the cohesive element. The model also relies on an electrochemical model, based on the slip-oxidation model and a diffusion model. Here the model was first shown giving satisfying result with a previously tested degradation model. The previous model was based on oxide current dependent density degradation. The model was then instead made dependent on the plastic strain rate and creep strains for oxide rupture to evaluate the effect of creep and plastic strain on crack growth and oxide thickness in intergranular stress corrosion cracking.

A finite element model was proposed for intergranular stress corrosion cracking modelling. The model is based around a moving integration point formulation which enables the model to track the oxide, dissolution, and crack tip. The formulation is introduced in the cohesive element. The model also relies on an electrochemical model, based on the slip-oxidation model and a diffusion model. Here the model was first shown giving satisfying result with a previously tested degradation model. The previous model was based on oxide current dependent density degradation. The model was then instead made dependent on the plastic strain rate and creep strains for oxide rupture to evaluate the effect of creep and plastic strain on crack growth and oxide thickness in intergranular stress corrosion cracking.

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