复合材料胶接搭接接头应力分析方法研究

Stress Analysis of Adhesively Bonded Composite Lap Joints

胶接是复合材料结构主要连接方法之一,对胶接接头进行应力分析是保证复合材料安全性、耐久性的关键。在初步设计阶段,一般采用解析方法对胶接接头进行应力分析及参数研究。针对复合材料双搭接和单搭接胶接接头,在Tsai等人的理论分析方法(TOM方法)基础上,提出了一种改进的搭接接头剪应力分析方法,该方法考虑了被胶接件的剪切变形,认为被胶接件只有在靠近胶层的半个厚度上产生剪切变形,剪应力沿该半厚度呈线性分布。算例分析结果表明:本文方法比现有的分析方法更接近于有限元模拟结果,可用于估算复合材料胶接接头剪应力分布。

Adhesively bonding is an important joint method in composite structures. The stress analysis of adhe sively bonded joint is the key to guarantee safety and durability of composites. Currently, in structure initial design stage, joint stress analysis and parametric study are normally performed with analytical methods. Based on the theoretical solution of Tsai, et al （TOM method）, an improved theoretical solution for adhesively bonded single-lap and double-lap joints is proposed, the shear effect in adhesive layer is considered. It is assumed that shear strain only exists in the half thickness of the adhesive layer. The results of improved analytical solution are compared with simulation results of finite element method as well as other existing methods, and show that the improved solutions are more close to numerical results than that of other existing theoretical ones for composite laminates. The proposed method can effectively estimate shear stress distributions of adhesively bond composite lap joint.