Abstract
Damage caused by corrosion is one of the main factors that diminish the performance of thin-walled structures such as pipelines. Using experimental and numerical methods, this study investigated the effects of corrosion depth and corrosion shape on the performance of corroded thin-walled steel pipes when subject to combined internal pressure and 4-point bending load. The effect of corrosion depth was studied using three API 5 L X52 grade pipe specimens with a nominal diameter of 8-inches (203 mm), and the effect of corrosion shape was investigated by testing five API 5 L X46 specimens with a nominal diameter of 6-inches (152 mm), containing different corrosion shapes. It was found that increasing the corrosion depth drastically decreases the bending capacity of the corroded specimens. Also, it was observed that the specimens with circular and square corrosion shapes exhibited the same bending behaviour, and extending the corrosion along the circumferential direction of the pipe wall caused the most negative effect on the bending behaviour of the specimen.
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