【摘要】 本文研究圆柱壳在流固冲击载荷下的弹塑性动力屈曲问题。建立了液体-气体-固体三相的 数学模型。其中结构部分控制方程由弹塑性力学中关于加速度的最小原理获得,本构关系采用增 量理论,液体假设为不可压缩,空气层认为是等熵压缩。分别讨论了不同冲击高度时压力变化规 律,屈曲对载荷的影响,屈曲沿壳长的分布及发展规律等。更多还原

【Abstract】 This paper presents a research upon the elasto-plastic dynamic buckling of a high speed moving cylindrical shell with head down vertically impinging on a body of still water, the problem of impact of solid to fluid. In the paper, a mathematical model relating to three phases, the liquid-gas-solid has been established together with the generalized variational principle. In the theory, the governing equations of the structure is obtained from a minimum principle of acceleration in dynamics of elasto-plastic continua at finite deformation in which the flow theory of plasticity is employed, it assumes that the liquid is incompressible and the gas is adiabatical. A number of numerical results are presented and the characteristics of the buckling behavior of the impact between fluid and solid are illustrated.更多还原