Numerical investigation on the effect of surface roughness on the ductility of steel plates corroded in marine environments subjected to tensile loading

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<p>Corrosion leads to thickness reduction and surface roughness on steel plates. Under loading, the roughness may cause high stress concentration, non-uniform yielding, and strain localization leading to a reduction in ductility. In this study, thickness data obtained from corroded steel pipe piles, which had been exposed to the marine environment for 19.5 years, were used to construct finite element (FE) models of corroded tensile test coupons. Elastoplastic nonlinear large deformation analysis was conducted on these coupons subjected to static monotonic tension using a general purpose FE analysis software. In addition, different surface roughness parameters of the corroded coupons were determined as specified in ISO 25178-2. Static ductility was found to decrease as surface height roughness parameters increased as a result of stress concentration and strain localization.</p>

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