【作者】 焦鹏； 许滉洋； 陈志平；

【Author】 JIAO Peng;XU Huangyang;CHEN Zhiping;Institute of Advanced Equipment,College of Energy Engineering,Zhejiang University;

【机构】 浙江大学能源工程学院特种装备研究所；

【摘要】 众所周知,轴压薄壁圆柱壳对初始缺陷高度敏感。围绕此问题,过去数十年间国内外已提出多种考虑轴压薄壁圆柱壳高缺陷敏感性的屈曲设计方法。能量壁垒方法(energy barrier approach,EBA)作为一种近年来新兴的基于壳体能量亚稳态的方法,在预测轴压圆柱壳屈曲载荷方面展现出了较高的精度。然而,迄今仍缺乏基于EBA考虑缺陷敏感性的轴压圆柱壳屈曲设计方法系统性研究。基于此,提出了一种基于EB A的轴压弹塑性圆柱壳下限屈曲设计新方法,首次阐明了EBA在轴压圆柱壳屈曲载荷预测中的局限性,并通过对比现有公开文献报道的试验结果,验证了新方法在纯弹性壳体与弹塑性壳体屈曲临界载荷预测方面的精度和在设计方面的可靠性。结果表明,提出的新方法在保证设计安全性的前提下,能够有效提升轴压圆柱壳的屈曲设计载荷,并具有减小壳体壁厚的潜力,这对未来大型薄壁圆柱壳结构的轻量化设计具有优势。更多还原

【Abstract】 As is well established,thin-walled cylindrical shells under axial compression exhibit high sensitivity to initial imperfections.In this context,numerous buckling design methodologies considering the high imperfection sensitivity of axially compressed thin-walled cylindrical shells have been proposed globally over the past decades.The energy barrier approach(EBA),an emerging methodology based on shell energy metastability in recent years,has demonstrated superior accuracy in predicting buckling loads of axially compressed cylindrical shells.Nevertheless,systematic research on EBAbased buckling design methods for imperfection-sensitive axially compressed cylindrical shells remains notably absent.To address this gap,a novel lower-bound buckling design method for axially compressed elastoplastic cylindrical shells based on EBA has been developed.This work first elucidates the limitations of EBA in predicting buckling loads of axially compressed cylindrical shells,and validates the accuracy in critical buckling load prediction and design reliability for both purely elastic and elastoplastic shells through comparative analysis with experimentally measured results reported in existing open literature.The results demonstrate that the proposed method effectively enhances the buckling design load of axially compressed cylindrical shells while ensuring design safety,with demonstrated potential for reducing shell wall thickness.This advancement offers significant advantages for future lightweight design of large-scale thin-walled cylindrical shell structures.更多还原