单壳体潜艇壳体结构损伤后的屈曲分析  

Analysis of the effects of the buckling of a damaged mono-shell submarine structure

作　　者：周素莲[1] 聂武[1] 彭懿[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2010年第9期1131-1137,共7页Journal of Harbin Engineering University

基　　金：海军武器装备预先研究资助项目(1010501030202);中央高校基本科研业务费专项资金资助项目(HEUCF100115)

摘　　要：针对单壳体潜艇遭受碰撞、搁浅、战时的武器命中和爆炸冲击,耐压壳体出现塑性变形但没有被击穿的损伤情况下的结构稳定性问题,利用几何缺陷薄壁圆柱壳的卡门-唐纳尔非线性应变位移关系式和变分法推导了具有初挠度的耐压壳的平衡方程和相容方程,给出了耐压壳的应力函数表达式.在只考虑几何非线性的情况下,利用里兹法得到了静水压力作用下的不同损伤程度艇体结构的载荷挠度幅值曲线和临界载荷.结果表明,与完美耐压壳体不一样,具有初挠度的耐压壳屈曲是极值点屈曲,载荷随挠度幅值增加到局部极大值后,随着挠度幅值的增大反而减小.随着损伤程度加深,即初挠度幅值的增大,耐压壳的临界压力减小,表明耐压壳的承载能力下降;同时随着损伤程度加深,极值点变得越来越不明显,极值点屈曲问题渐渐转变为强度问题.When mono-shell submarines are damaged by collisions,strandings,or the explosions of weapons,plastic deformation of the structure can cause buckling of the mono-shell pressure hull without causing complete breakdown.It would be useful to have a means of evaluating the remaining strength of the hull.By employing the Von Karman-Donnell nonlinear strain-deflection relations for geometrically imperfect and thin cylinders as well as variational methods,compatibility and equilibrium equations for a damaged hull were derived.Based on the compatibility equation,an expression of the stress function was then obtained.By employing the Ritz method,expressions of the geometric nonlinear critical load and load-displacement amplitude curves of the variable imperfections in the hull under hydrostatic pressure were derived.The results showed that,unlike an undamaged pressure hull,hydrostatic buckling of the imperfect pressure hull occurs at extreme points.Loads increased with deflection amplitude to beyond its maximum value,then decreased with increasing deflection amplitude.With increased degrees of damaged to the structure（increased initial deflection amplitude）,the critical load capacity of the pressure hull decreased,which indicated a falling load capacity of pressure hull.And at the same time,extreme points become more and more indistinct and the problem of buckling of extreme points gradually became a structural strength problem.

关 键 词：单壳体 损伤 几何非线性 临界载荷 屈曲 

分 类 号：U674.76[交通运输工程—船舶及航道工程]