刚度导数法在含裂纹铆接加筋板应力强度因子计算中的应用

本文探讨了刚度导数法用于含裂纹铆接加筋板应力强度因子计算的问题。提出了选取对刚度导数矩阵有贡献元素的一种新方法,成功地解决了裂尖位于筋条轴线附近时,采用刚度导数法计算应力强度因子的困难。算例结果表明,本文提出的方法是正确有效的。文中还阐述了刚度方程降阶的方法,这种方法对于应用小容量计算机求解较大的结构分析问题,有一定的参考价值。

Application of the Stiffness Derivative Method to Calculating Crack Tip Stress Intensity Factor in Cracked Panel with Riveted Stiffeners

This paper deals with the application of the stiffness derivation method to cal- culating stress intensity factor of cracked panel with riveted stiffeners. It proposes a new method of selecting contributive elements to the stiffness derivative matrix, which succesfully resolves the difficulty of calculating the stress intensity factor by using the stiffness derivative method with the crack tip near the axis of the stiffener. Experimental calculation results show that the proposed method is correct and effective. It also expounds a method of reducing the stiffness equations rank, which has certain reference value for analysis of more complicated structures by using a computer with smaller memory space.