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.