轴压载荷下夹层圆柱壳结构屈曲承载力优化  

Optimization of Buckling Capability of Sandwich Cylindrical Shell Structures Under Axial Compression Load

作　　者：唐其琴[1] 李伯阳[1] 丁志伟[1] 胥馨尹 TANG Qi-qin;LI Bo-yang;DING Zhi-wei;XU Xin-yin(Institute of Systems Engineering,China Academy of Engineering Physics,Sichuan Mianyang621999,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621999

出　　处：《机械设计与制造》2020年第8期80-84,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金项目(11402247)。

摘　　要：夹层圆柱壳结构在导弹、火箭、船舶舱体结构及飞机机身结构上有着广泛的应用前景,此类结构承受轴压或弯曲载荷时极易屈曲和结构失稳,主要的失效形式表现为总体和局部屈曲。采用解析方法对轴压载荷下的夹层圆柱壳结构进行了受力分析,获得了影响结构承载效率的设计参数。采用有限元方法建立了参数化建模、屈曲分析和优化设计一体化分析与设计模型,通过解析和有限元结果比对分析验证了优化模型的准确性,并利用优化模型对夹层圆柱壳结构进行了承载力效率优化。数值算例结果表明:优化后结构承载效率从4.397×10^6N/kg增加到5.687×10^6N/kg,提升了29%,表明通过在可行设计域内对设计变量进行合理取值,能够获得承载性能更高效的结构,可为夹层圆柱壳结构设计应用提供参考。Sandwich cylindrical shell structures have comprehensive applications in structures such as missiles,rockets,ship cabin structures as well asfuselage structures.When bearing with axial compression or flexual loads,sandwich cylindrical shell structuresare susceptible to buckling and structural instability,the main failuremodes are column buckling and shell buckling.Mechanical analysis of sandwich cylindrical shell structures under uniform axial compression load was performed by analysis method,and influencing design parameters of carrying efficiency was obtained.Based on the integration of parametricmodeling,buckling analysis and optimizationdesign,Integratedanalyticaldesign model was established by the finite element method(FEM). A comparative analisis of analyticalresults and finite elementresults verified the correctness of optimal model. Through the optimal model the optimizationof carrying efficiency of sandwich cylindrical shell structure was executed. Results of the numerical example shows that the load-carrying efficiency is improved from 4.397 ×10^6 N/kg to 5.687 ×10^6 N/kg,with an increase of 29%. It is indicated that an efficientsandwich cylindrical shell structure might be achieved by optimizing design variables within the feasibledesignregion reasonably,which may provide a referencefor design and applications of the sandwich cylindrical shell structures.

关 键 词：夹层圆柱壳 屈曲 承载效率 临界力 参数化建模 优化设计 

分 类 号：TH16[机械工程—机械制造及自动化] TB472[一般工业技术—工业设计]