锥柱形膜片后屈曲的材料特性预示研究  

EFFECTS OF MATERIAL PROPERTIES ON POST-BUCKLING OF SPHERICAL-CONE DIAPHRAGMS FOR POSITIVE EXPULSION TANKS

作　　者：周算[1] 强洪夫[1] 王广[1] 王学仁[1] 

机构地区：[1]第二炮兵工程学院,西安710025

出　　处：《力学与实践》2012年第2期24-28,共5页Mechanics in Engineering

基　　金：国家973计划资助项目(61338)

摘　　要：使用正交表设计数值试验,分析弹性模量、屈服强度、延伸率等材料特性参数对锥柱形膜片结构后屈曲状态的影响,预示材料特性对膜片翻转的影响.正交数值试验在不影响结果科学性的基础上,极大地降低了试验次数.数值试验结果表明:在一定结构情况下,弹性模量与屈服强度对膜片正向翻转影响非常显著,而延伸率的影响与前两个因素比较而言,几乎可以忽略.并且,结构顶点位移随材料的弹性模量增大而增大;随材料的屈服强度减小而增大.因此,在结构固定的情况下,为了提高材料的翻转性能,可以选择弹性模量较大而屈服强度较小的材料,且延伸率为20%左右最好.This paper numerically analyzes the effects of elastic modulus,yield stress and elongation percentage on the post-buckling of spherical-cone diaphragms for positive expulsion tanks based on orthogonal tests.With orthogonal tests,the number of tests is greatly reduced,without affecting the validity of results.Numerical results are as follows：according to the specific diaphragm considered in the paper,its elastic modulus and yield stress have a marked effect on its post-buckling,while the elongation percentage hardly affects the post-bucking of the structure.The top node displacement of diaphragms increases with the increase of the elastic modulus and the decrease of the yield stress.As a result,large elastic modulus,small yield stress and about 20%of elongation will be optimal for diaphragm expulsion.

关 键 词：锥柱形膜片 材料特性 正交试验 数值分析 后屈曲 

分 类 号：O342[理学—固体力学]