复合材料多墙式结构非线性稳定性分析

ANALYSIS OF THE NONLINEAR STABILITY OF COMPOSITE MULTIWEB STRUCTURES

多墙式结构是用整体的蒙皮腹板结构替代传统的蒙皮加筋结构。它可以降低翼面高度 ,减轻重量 ,提高结构效率。当前特别需要一种关于复合材料多墙结构的分析计算方法。本文作者在层合板非线性稳定理论的基础上 ,针对多墙结构这一具体结构形式 ,采用刚度等效方法 ,建立了相应的本构方程和非线性稳定性控制方程组 ,并对其进行数值求解 ,得到各种边界条件下和面内载荷下的总体和局部失稳临界载荷。通过分析验证 。

Multiweb structures are integral ones composed by upper skin,lower skin and webs. This kind of structure can reduce the height and weight of wings and at the same time,maintain the strength and rigidity. Moreover,the application of composite multiweb structures in modern fighters is becoming an inevitable trend because of the various advantages of this material. To solve the problem of buckling,the theory of nonlinear stability of composite laminates and method of rigidity equivalence are adopted in this article. The relevant constitutive equation and nonlinear stability governing equations are established. At last,the nonlinear equations are solved by numerical computation. The overall and local critical loads of buckling are obtained under various boundary conditions and compressive and shear loads in plane. The validity and effectiveness of the theory and method are demonstrated by comparison with the solutions obtained by the other existent references. They can satisfy absolutely the demands of engineering.