特轻薄异型件变形状态的仿真研究

基于新型组合瓶盖的结构特点和功能分析,将该组合体基本件衬垫和外体抽象为薄板和薄壁圆筒.根据虚功原理,在所划分的228个三角形元素上应用修正的拉格朗日有限元方法模拟和分析等轴施压载荷下衬垫的变形状态.按照Trasca屈服准则,探讨了组合压装时外体和衬垫的弹塑性变形,实验研究了衬垫沿径向的应力分布及不同载荷下外体和衬垫直径的变化.实验结果表明了理论分析的合理性.本研究所获得的最大许用压力在实际瓶盖生产线的设计中得到成功运用,本研究为新式组合瓶盖生产压装关键技术奠定了理论和实验基础.

The Simulation on the Deformation of Very Light and Thin Components with Special Shape

Based on the analyses of the structural feature and the requirements of functions of the composite bottle cover of the new kind,two fundamental components,the lining washer and the outer body,are abstracted into a plate and a cylinder with thin wall,respectively.For simulating the deformation of the lining washer under axial pressure the modified Lagrangian finite element analysis is applied according to the virtual work principles with the grid of 228 triangular elements.Under the pressing force the elastic and plastic deformations of both the lining washer and the outer body are studied with Tresca's yielding rule and the limitation of the plastic deformation is presented when the two components are assembled into a unit.For the production of this kind of bottle cover,experiments are carried out by carefully measuring the changes of the diameter of lining washer as well as that of the outer body.It is showed that results from the experiment have a good agreement with the theoretical calculation,and the maximum value of the allowance pressure has successfully been used in the design of the production system for the newly developed bottle cover.