铆接加筋板应力强度因子计算中几个问题的研究

 给出了采用J积分法计算加筋板应力强度因子时选择积分回路的方法;同时给出了采用刚度导数法计算加筋板应力强度因子时刚度导数的计算方法;另外,还对模拟铆钉连接作用的3种方法进行了初步研究。

THE STUDY OF CALCULATION METHODS FOR STRESS INTENSITY FACTOR OF RIVETED STIFFENED PANELS

This paper presents a method for selecting the integration path in calculating the stress intensity factor of riveted stiffened panels by means of J-integral method. The calculation method for stiffness derivative in calculating stress intensity factor of riveted stiffened panels with stiffness derivative method has been given as well. The preliminary research on applications of symmetricity and three methods of simulating the behaviour of rivet joint has been carried out. A calculation example related to stress intensity factor of a riveted stiffened panel has been presented. The calculation results show that when the rivets are regarded as rigid joint, the results obtained by stiffness derivative or J-integral method agree well with the results derived from rivet force method; the stress intensity factor increases significantly while the rivet elasticity is taken into account; the elastic behaviour of rivets can be simulated by either orthogonal equivalent bars or equivalent shear panels.