水下高速运动不完整壳体屈曲可靠性分析

Buckling Reliability Analysis of the Imperfect Shell at High Speed Motion in Water

针对有初始缺陷的水下高速运动圆锥壳体的屈曲问题,建立了简化的力学模型。通过推导得出了理想情况下的水下高速运动圆锥壳体的屈曲载荷;并在此基础上确定了有初始缺陷情况下的屈曲载荷及其与初始缺陷之间的关系,从而建立了结构的安全余量方程,得到了结构的可靠性指标及失效概率。通过算例表明初始缺陷对结构的失效概率有明显的影响,因此,本文的分析具有一定的意义。

For the question of buckling of the conical shell body at high speed motion in water with initial imperfection, a simplified mechanical model was established. The buckling load of perfection conical shell at high speed motion in water was obtained from the derivation; the buckling load at imperfection situation and the relation between the load and the initial imperfection were determined, to establish the safety margin equation and obtain reliability index and failure probability of the structure. Through the example it can be seen that the influence of initial imperfection on the structural reliability is distinct, there- fore, the analysis in the paper has some significance.