金属加筋板压缩稳定性分析的随机缺陷法  

Stochastic imperfections method of stability analysis on metal stiffened panel under compression load

作　　者：李凤鸣[1,2] 唐敢[2] 童明波[1,2] 

机构地区：[1]南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016 [2]南京航空航天大学航空宇航学院,南京210016

出　　处：《计算机辅助工程》2015年第1期26-31,共6页Computer Aided Engineering

基　　金：航空科学基金(2010ZA52009);江苏省优秀学科建设项目

摘　　要：为使金属加筋板稳定性分析更加真实可靠,在分析中引入随机的初始几何缺陷,采用一致缺陷法通过ANSYS对金属加筋板进行压缩稳定性有限元分析,总结一致缺陷法的优缺点,进而提出一种考虑加筋板初始几何缺陷的随机缺陷法并进行试验.结果表明:一致缺陷法对非线性变形分析有一定的引导作用,使非线性变形朝着特征值屈曲模态的方向发展;随机缺陷法将结构的初始缺陷看作是随机的,缺陷大小和分布无法预测,更能反映加筋板真实的工作性能.编写加筋板自动建模程序和随机缺陷自动分析程序,从而大大提高分析效率,使随机缺陷法用于设计成为可能.To make more reliable and stable analysis on the stability of metal stiffened panel,the stochastic initial geometric imperfections are introduced into the analysis,the finite element analysis on metal stiffened panel stability under compression load is performed by consistent imperfections method using ANSYS,the advantages and disadvantages of the consistent imperfections method are summarized,and a stochastic imperfections method is proposed considering initial geometric imperfections of stiffened panel and a test is carried out. The results show that,the consistent imperfections method plays a guide role in nonlinear deformation analysis,which makes the nonlinear deformation to develop toward the direction of eigenvalue buckling modes; the initial imperfections of the structure is random in the stochastic imperfections method and its size and distribution can not be predicted,and therefore the stochastic imperfections method can reflect the real performance of stiffened panel better. An automatic modeling program and an automatic analysis program for stochastic imperfections of stiffened panel are developed,which greatly improve the analysis efficiency and make the stochastic imperfections method possible for design.

关 键 词：飞机 金属加筋板 稳定性分析 随机缺陷法 一致缺陷法 有限元 ANSYS 

分 类 号：V414[航空宇航科学与技术—航空宇航推进理论与工程]