复合材料夹芯管胶接连接结构力学特性分析

Mechanical property analysis of composite adhesively bonded sandwich pipe joints

针对在航空结构中广泛应用的复合材料蜂窝夹芯圆管中的接头这一最脆弱的部分,发展了一种分析复合材料蜂窝夹芯圆管胶粘接头力学特性的解析模型。该模型根据Gibson修正公式得到了蜂窝芯子的等效弹性参数,再运用经典的复合材料壳理论和线弹性理论得到管接头的控制方程,并通过状态空间法进行求解。运用本文模型,计算了管接头在扭矩和弯矩作用下胶层内的剪应力和剥离应力;同时采用有限元法对模型进行了数值模拟,并将模拟结果与模型计算结果进行了对比,最后分析了搭接长度对胶层内应力的影响。

An analytical model for the joints of composite honeycomb sandwich pipes widely used as the aviation structures,which is the most vulnerable part,was developed to investigate the mechanical characteristics of adhesively bonded composite honeycomb sandwich pipe joints.Equivalent elastic parameters of the honeycomb core were obtained according to Gibson's correction formula,and the governing equations were acquired by using the classic composite shell theory and linearly elastic theory,and it was solved through the state space method.The adhesive shear stress and peel stress of pipe joint under torgue and bending moment were calculated by the proposed analytical model.And finite element method was used to simulate the model and the simulated results were compared with the model calculated results.In addition,the influence of overlap length on adhesive stress was analyzed.