外压作用下含局部减薄缺陷圆柱壳屈曲特性与屈曲载荷研究OACHSSCD

This study examines the buckling behavior of cylindrical shells with localized thinning defects under external pressure.Using finite element analysis,we assess how factors such as the length-to-diameter ratio,diameter-to-thickness ratio,boundary conditions,and localized thinning parameters affect the elastoplastic buckling load of these shells.A nonlinear regression approach is adopted to develop a formula for predicting the elastoplastic buckling load of cylindrical shells with localized thinning defects.The results indicate that localized thinning defects significantly reduce the buckling load,with thinning depth exhibiting the most significant influence.For small localized thinning defects,an increase in the length-to-diameter and diameter-to-thickness ratios causes a reduction in the buckling load.For large localized thinning defects,the buckling load increases as the length-to-diameter ratio increases.These findings provide valuable insights for defect assessment in pressure vessels and are of significant importance for ensuring the safety and reliability of engineering structures.