Corrosion defect is considered to be one of the major critical damages of subsea pipelines, which can result in a considerable loss in the collapse capacity of thick-walled pipes in deep waters. In this paper, collapse experiments on 13 small-scale seamless steel tubes with varying sizes of elliptical and rectangular corrosion defects were carried out in a sealed hyperbaric chamber. The collapse pressure and deformed configurations were obtained, with four types of collapse trajectories identified. A numerical framework was established to simulate the collapse event using ABAQUS, and decent consistency of the collapse pressure and collapsed configurations was observed between numerical and experimental results. Then, the collapse pressure of thick-walled pipes with a single elliptical corrosion defect was studied parametrically, covering different defect sizes, geometric characteristics, and material properties. Based on the extensive numerical analysis, a reasonable empirical formula was developed to estimate the collapse pressure of thick-walled steel pipes with various elliptical corrosion defects and material properties.

腐蚀缺陷被认为是海底管道的主要严重破坏之一，它可能导致深水厚壁管道的坍塌能力大大降低。本文在密闭的高压室内对13种不同尺寸的椭圆形和矩形腐蚀缺陷的小型无缝钢管进行了倒塌试验。获得了崩溃压力和变形形态，并确定了四种崩溃轨迹。建立了使用ABAQUS模拟倒塌事件的数值框架，并且在数值和实验结果之间观察到了倒塌压力和倒塌构造的良好一致性。然后，对具有单椭圆腐蚀缺陷的厚壁管的破坏压力进行了参数研究，涵盖了不同的缺陷尺寸，几何特征和材料属性。在广泛的数值分析的基础上，建立了合理的经验公式来估算具有各种椭圆腐蚀缺陷和材料性能的厚壁钢管的坍塌压力。