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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。
Aiming at the most fragile part of joint in composite honeycomb sandwich pipe widely used in aeronautical structure, an analytical model for analyzing mechanical properties of composite honeycomb sandwich pipe bonded joints has been developed. The model obtains the equivalent elastic parameters of the honeycomb core according to the Gibson correction formula, and then uses the classical composite shell theory and linear elasticity theory to obtain the governing equations of the pipe joint. The solution is solved by the state space method. Using the model, the shear stress and the peel stress of the joint under the action of torque and bending moment are calculated. At the same time, the numerical simulation of the model is carried out by the finite element method. The simulation results are compared with the model calculation results. Finally, The effect of lap length on the stress in the adhesive layer was analyzed.