内压载荷下复杂薄壁箱形结构数值模拟与优化设计  

Numerical investigation and optimum design of complex thin-walled structures subject to internal pressure load

作　　者：马歆[1] 郑津洋[1] 陈西南[1] 刘富君[1] 孙国有[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2006年第5期897-902,共6页Journal of Zhejiang University：Engineering Science

基　　金：教育部高等学校博士学科点专项基金资助项目(20010335032)

摘　　要：基于有限元软件MSC.Marc/Patran,考虑材料非线性和几何非线性,对装配式不锈钢水箱这种以内压载荷为主的复杂薄壁箱形结构的力学响应进行了数值分析.得到了箱体在内压载荷下的应力和位移变化特性,箱体各模压板块中与加强槽毗邻的球冠边缘区域的应力始终占控制地位;获取了箱体的屈曲失效模式,基准模型箱体底板的屈曲临界载荷为0.080 MPa;分析了屈曲临界载荷数值模拟值与经典理论值之间存在较大差异的原因.通过对模压板块的球冠高度与直径、加强槽的位置和尺寸以及强化拉筋的布置方式等参数进行优化,提高了箱体的承载能力.数值模拟结果与试验数据较为一致,表明了所用数值方法的有效性.Some numerical simulations using commercial FEA code Marc were conducted by considering nonlinearities of both material and geometry in order to investigate the mechanical response of Assembled Thin-Walled Water Tank （ATWWT）. The characteristics of deformation and the properties of stress distribution of this kind of structure were obtained, while the largest Mises equivalent stress are found to be located at the region between the reinforcement channels and the convex face in the molded units of the model ATWWT. It was showed that the initial geometric imperfections and the varied boundary conditions have significant influence on the ultimate strength of bottom molded units where failure is mainly local buckling of the convex face. By optimizing structure parameters such as the height and diameter of the convex face, the reinforcement channels position and the arrangement of stiffeners, an optimum shape of molded unit is presented that enhances the load-carrying capability of ATWWT. The results found in finite element model are in good agreement with those obtained in the experiment.

关 键 词：薄壁结构 内压载荷 力学响应 数值模拟 屈曲 优化设计 

分 类 号：TB24[一般工业技术—工程设计测绘] TB125[理学—工程力学]