结构分析程序中几个问题的处理方法

JY851程序是一个复合材料、金属混合结构应力分析及强度校核程序。从1986年投入使用以来,已推广到几个厂、所使用,计算了几个型号的机翼、垂尾、方向舵等复合材料结构。现就编写元素刚度矩阵中所遇到的几个问题的处理方法作一简单的介绍。 1.复合材料板弹性模量阵的计算 复合材料板弹性模量阵A、B、D的计算中,关键是求偏轴模量阵ō],层压板中第

THE HANDLING METHOD OF SOME PROBLEMS IN PROGRAM OF STRUCTURAL ANALYSIS

The effect of the element shape on the element stiffness matrix of thin shear plate is considered and the shape factor with the vector method is computed when designing the structure analysis program with the finite element method. The choice of Gauss Integration Points in the numerical integration is also considered in order to improve the calculating accuracy and decrease the cost of computation. An element stiffness matrix of quadrilateral bent plate which is solved with the Guass Integration is derived. In the stiffness matrix superimposition, the sixth degree of freedom grid is introduced and the spectial coefficient matrix is employed, so that the general stiffness matrix singularity can be avoided as the elements are coplauar. Two practical examples show that these methods are effective.