Journal
THIN-WALLED STRUCTURES
Volume 136, Issue -, Pages 106-112Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2018.12.014
Keywords
Thin-walled spherical vessel; Pitting corrosion; Stress concentration factor; Finite element analysis; Modelling studies
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This paper aims to investigate the effect of pitting corrosion on stress concentration factor (SCF) for a spherical pressure vessel subjected to internal pressure. Stress concentration at semi-elliptical corrosion pit and secondary pit nucleated at bottom of the semi-elliptical base pit are examined systematically by conducting a series of axisymmetric finite element models. SCF occurs at the bottom of the semi-elliptical pits and increases as pit depth enhances but decreases as pit width enlarges. Pit aspect ratio is a principal parameter affecting stress. Presence of a premature pit at the bottom of base pit intensifies the stress distribution and SCF.
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