含多分层损伤的先进复合材料格栅加筋圆柱壳(AGS)的热-机耦合非线性屈曲分析  

THERMAL-MECHANICAL BUCKLING BEHAVIOR OF ADVANCED COMPOSITE GRID STIFFENED SHELL WITH MULTI-DELAMINATIONS

作　　者：陈浩然[1] 周柏华[1] 白瑞祥[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116024

出　　处：《工程力学》2008年第8期58-63,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(10302004);国家重大基础研究计划(973)项目(2006CB601205)

摘　　要：采用基于复合材料一阶剪切理论的有限元法研究了含多分层损伤的先进复合材料格栅加筋(AGS)板壳结构的热-机耦合屈曲性态,在屈曲分析中考虑了材料热物理、力学性质与温度相关特性和分层损伤处的上子板、下子板的接触效应。同时在分层前缘采用了位移约束条件以保证分层区域的各子板的变形相容要求。通过一含多分层损伤的典型复合材料格栅(AGS)圆柱壳结构算例分析,讨论了在热-机耦合作用下分层大小、个数和分层位置对该结构屈曲性态的影响。结果表明:复合材料格栅(AGS)圆柱壳结构具有较强的抗热屈曲的能力和良好的损伤容限性。该文提出的方法和所得结论将对AGS结构的热-机耦合屈曲能力的预测和损伤容限设计具有一定参考价值。Based on the first order shear deformation theory, this paper develops a nonlinear finite element analysis method to study thermal buckling behavior of the advanced composite grid stiffened shells with multi-delaminations. In this paper, the temperature-dependent thermal and mechanical properties and the contact effect between sub-laminates of delaminated regions on the buckling behavior were considered, and a constrained model was established to ensure deformation compatibility between the sub-laminates along the front of the delaminated regions. Numerical analysis for some typical circular cylindrical shells （AGS） with multiple delaminations were performed, and the effects of delamination sizes, numbers and areas on buckling behavior of AGS under thermal-mechanical loads were discussed. It can be seen that the advanced grid stiffened shell （AGS） has strong thermal bucking resistance and good damage tolerance. The methods and conclusions drawn in the paper can provide reference for the prediction of anti-thermal-mechanical buckling capacity and damage tolerance design for AGS.

关 键 词：复合材料格栅结构 多分层损伤 热-机耦合 接触效应 非线性热屈曲性态 

分 类 号：TU599[建筑科学—建筑技术科学]