薄壁圆筒轴压屈曲的严格渐近分析
Rigorous asymptotic analysis of buckling of thin-walled cylinders under axial compression
摘要：
本文利用文献[6]中引入的二阶变分的严格本构线性化方法，研究了轴压圆柱壳均匀变形的弱稳定性。结果表明，当临界载荷与von-Kármán-Donnel壳理论中的分叉载荷相一致时，这种变形变得弱不稳定。我们还证明了由Koiter圆[11]描述的线性分叉模式渐近地最小化二阶变分。我们的分析的关键成分是渐近尖锐的估计的Korn常数的圆柱壳和Korn-like不等式的分量的变形梯度张量在柱面坐标。本文进一步发展了文[6]中引入的屈曲等效概念，并使之成为本文的中心内容。文中还指出了该理论的特点与临界载荷对载荷和形状的敏感性之间的联系。
英文摘要：
Using rigorous constitutive linearization of second variation introduced in [6] we study weak stability of homogeneous deformation of the axially compressed circular cylindrical shell, regarded as a 3-dimensional hyperelastic body. We show that such deformation becomes weakly unstable at the citical load that coincides with value of the bifurcation load in von-Kármán-Donnel shell theory. We also show that the linear bifurcation modes described by the Koiter circle [11] minimize the second variation asymptotically. The key ingredients of our analysis are the asymptoticaly sharp estimates of the Korn constant for cylindrical shells and Korn-like inequalities on components of the deformation gradient tensor in cylindrical coordinates. The notion of buckling equivalence introduced in [6] is developed further and becomes central in this work. A link between features of this theory and sensitivity of the critical load to imprefections of load and shape is conjectured.
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