Study on mechano-electrochemical interaction laws of corrosion defects on internal and external surfaces of elbows
In order to further investigate the mechano-electrochemical(M-E)interaction laws of corrosion defects on the in-ternal and external surfaces of elbows,a three-dimensional model of the internal and external surfaces of elbows containing corrosion defects based on multi-physics field coupling was established,and the influence of internal pressure and defect ge-ometry on the M-E interaction laws and the elbows was studied.The results show that when the corrosion defects exist on in-ternal and external surfaces of elbows,the M-E effect on the internal side of elbow is stronger,which promotes the growth rate of stress and corrosion,making the internal side of elbow more prone to failure.When the defect geometry grows,the stress grows in the length and width directions of defects,while the corrosion grows mainly in the length direction of defects.The stress and corrosion growth laws around the defects on external surface are almost consistent,while the stress growth around the defects on internal surface is more complex than the corrosion growth.The research results can provide theoretical guidance for the improvement of the evaluation model of elbows containing corrosion defects and the integrity management of pipeline system.
elbowdefects on internal and external surfacescorrosionmulti-physics field coupling modelfinite element analysis
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