格栅非均匀分布效应对复合材料格栅加筋圆锥壳体稳定性的影响  

THE EFFECT OF NON-UNIFORM DISTRIBUTION OF GRID ON STABILITY OF ADVANCED GRID STIFFENED COMPOSITE CONICAL SHELL

作　　者：石姗姗[1] 孙直[1] 任明法[1] 陈浩然[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,大连辽宁116024

出　　处：《工程力学》2012年第4期43-48,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(90816025);重大基础研究计划(973)项目(2011CB610304)

摘　　要：研究格栅非均匀分布效应对先进复合材料格栅加筋圆锥壳体稳定性的影响。首先,基于格栅间距沿母线方向的变化特征和等效平铺模型推导了格栅加筋圆锥壳体的等效刚度阵。其次,采用Donnell型扁壳理论推导了在均布外压作用下格栅加筋圆锥壳体稳定性分析的总势能表达式,利用最小势能原理得到了该壳体总体稳定性的临界载荷值,所得计算结果与实验结果十分吻合。最后,通过典型数例参数讨论,说明格栅非均匀分布效应对先进复合材料格栅加筋圆锥壳体稳定性的影响将随底锥角增大而显著。该文将为先进复合材料格栅加筋圆锥壳体的参数优化设计提供一种高效和可靠的分析方法。The influence of grid＇s non-uniform distribution on the stability of advanced grid stiffened（AGS） composite conical shells has been studied.The distances between ribs of AGS conical shells vary along the shell longitudes,which ultimately results in the longitude dependence of the stiffness distribution.In this paper,the variable stiffness matrices considering various coupling effects along the longitudes were deduced based on equivalent stiffness model.Making use of Donnell form of relations for shells and the minimum potential principle,the critical load was predicted.The analytical result of AGS conical shells has a good agreement with the experimental data,indicating the validity of the analytical model and method provided.In addition,the non-uniform distribution of grid significantly influences the stability of AGS conical shells.Optimal study and design can be performed using the proposed method.

关 键 词：先进复合材料格栅加筋结构(AGS) 圆锥壳体 总体稳定性 等效刚度模型 格栅非均匀分布效应 

分 类 号：O242[理学—计算数学] U663[理学—数学]