复合材料厚板多钉连接载荷分配计算模拟方法研究.doc

Numerical Method for Calculating Load Distribution in Multi-Bolt Thick Laminate Joints W?X? Liu, L.Q. Liu*, R. Wei (School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, China, 200240) plate 1 ；plalc26x 23456 load U-direction)五⑶ plate 1 ； plalc26x 23456 load U-direction) 五⑶ L Introduce Due to the extensively uses of the multi-bolt thick laminate joints in primary load comp on ents, it is very imporlanl lo do research on the subject. In years, many researches studied the load transferring problem and the influences of the geometrical parameter, the material property and the modeling method have on the load distribution in composite mechanical joint using experimental and numerical method. The previous works did great contribution to the field of composite joint study, but focused only on the thin plate structure, which did not consider the non-uniiorm load distribution along thickness? Hence a new last and accurate method, which will consider the thickness effects, is needed to con struct for the an alysis of the thick laminate joints problem. 2. Fastener flexibility According to the deformation analysis, it can be concluded lhal the deformation of lhe fastener includes the following parts: the shear and bending deformation of the fasteners, plate /, bearing deformation by the fasteners and the fasteners9 bearing deformation by the plate i. Correspondingly, lhe Hexibility of the fastener includes the following composition: the shear flexibility C加，the bending flexibility C”，the bearing flexibility of the plate C切》the bearing flexibility of lhe fastener C奶 Normally, the fasteners ilexibilily can get through lhe calculation: Cb = Cbs+Cbb+Cb人 +CbPi + cbh +c切2 (1) The flexibility of the fastener can be detailed as: r 、%4+57也+9衬+57用+9f； 7，~12GA 38^/(rt +r2) (2) 1111 + + + + 旺讥 ^Ex2 t2Ecf Otherwise, as the increase of the thickness, the load distribution through the thickness is more unequal, and this will impact lhe fastener^ ilexibilily and th