Abstract This study focused on the buckling of corroded spherical shells with wall-thickness reduction in local regions under a uniform external pressure. For spherical shells whose wall thickness was reduced owing to local corrosion on the outer surface, the effects of the shape, area, depth, and location of the reduction on the buckling properties were evaluated to identify the most dangerous case. Accordingly, the load-carrying capacity of corroded spherical shells with local reduction was predicted. Moreover, by verifying the five buckling prediction formulas of the spherical shells, reasonable prediction formulas for the compressive capacity of the spherical shells under the condition of corrosion defects were obtained. Four scale models were fabricated using resin material for testing. The geometric shape and wall thickness of each spherical shell model were measured and compared with those of the ideal model. Then, the buckling load and ultimate collapse mode were determined through a hydrostatic test. The experimental and numerical analysis results were compared to verify the numerical analysis.

中文翻译：

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外压腐蚀球壳局部壁厚减薄屈曲

摘要 本研究的重点是均匀外压作用下局部壁厚减小的腐蚀球壳屈曲问题。对于由于外表面局部腐蚀而壁厚减少的球壳，评估了减少的形状、面积、深度和位置对屈曲性能的影响，以确定最危险的情况。因此，预测了局部减少的腐蚀球壳的承载能力。此外，通过对球壳5种屈曲预测公式的验证，得到了腐蚀缺陷条件下球壳抗压能力的合理预测公式。使用树脂材料制作了四个比例模型进行测试。测量了每个球壳模型的几何形状和壁厚，并与理想模型的几何形状和壁厚进行了比较。然后，通过静水压试验确定屈曲载荷和极限坍塌模式。将实验结果与数值分析结果进行对比，验证数值分析的正确性。