一种基于钉“超元”的复合材料机械连接钉载计算方法

连接区的设计是复合材料设计中一个很关键的环节, 而确定钉载分布又是多钉接头中的重要问题。本文基于位移法原理, 提出一种以有限元“超元”为基础的钉载分析计算方法, 避免了实验测定复合材料P-D曲线的困难, 同时由于“超元”技术的采用具有较高运算效率。本文方法对接头的几何外形、尺寸、钉的排列方式、外载及边界条件等没有限制。与试验及文献算例结果比较, 证明了本文方法正确、可靠。最后, 利用本文方法对多种情况钉载分配进行了参数研究, 得出一些规律性结论。

METHOD OF JOINT CALCULATION FOR COMPOSITE PLATE BY SUPER ELEMENT

The design of joint area is the key to composite structures, and the determination of joint load is the critical part of a multi fastener joint problem. Based on the displacement method of FE theory, a method for determination of joint load distribution is suggested in this paper which is based on the finite super element. The difficulty of determining composite P δ curve by experiment is avoided, and at the same time this method possesses higher computational efficiency. There are no any limitations on the joint geometrical shape, dimensions, arrangement of joints, external applied loads, boundary conditions, etc. in this method. The accuracy and efficiency of this method are verified by tests and typical examples. At last, the load distribution in many cases is studied and some important conclusions have been obtained.