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对不同胶层厚度的复合材料双搭接接头拉伸强度进行了试验研究,结果表明接头的破坏模式是胶层剪切破坏,并且接头的极限强度随胶层厚度的增加而增大。在此基础上建立解析模型对复合材料双搭接接头胶层剪切破坏进行研究,模型中考虑了复合材料层板单层的各向异性及胶层的理想弹塑性材料属性,通过与有限元模型计算结果进行对比,验证了解析模型在计算胶层剪切应变/应力分布时的有效性。解析模型使用最大剪切应变准则计算接头的极限拉伸强度,计算得到的接头极限强度与试验结果吻合良好。
Tensile strength of composite double lap joints with different adhesive layer thicknesses was studied. The results show that the failure modes of the joints are shear failure, and the ultimate strength of the joint increases with the increase of the thickness of the adhesive layer. Based on this, the analytical model was established to study the shear failure of the composite double-lap joints. The anisotropy of single layer and the ideal elastic-plastic material properties of the adhesive layer were considered in the model. The results of the model are compared to verify the effectiveness of the analytical model in calculating the shear strain / stress distribution in the rubber layer. The analytical model uses the maximum shear strain criterion to calculate the ultimate tensile strength of the joint, and the calculated ultimate strength of the joint is in good agreement with the experimental results.