单搭接接头胶层间隙对强度和应力的影响

研究单搭接接头胶缝中预留间隙对接头拉剪强度和应力分布的影响。结果表明，随着间隙长度的增加，接头的承载能力趋于减小，但接头的实际剪切强度却持续上升；当间隙长度继续增加时，接头的实际强度趋于下降。研究中还发现间隙所处的位置对接头的抗剪强度有较大的影响，胶层端部预留间隙使接头的承载能力和实际强度均显著下降。有限元数值分析结果表明，间隙长度超过某特定值后胶层中的应力集中程度会急剧上升，间隙位于端部时胶层中的应力集中程度明显高于位于中部的场合。

EFFECT OF ADHESIVE OF RECESSING ON THE STRENGTH AND STRESS OF SINGLE-LAP JOINT

The effect of the recessing on the strength and stress distribution of adhesively bonded single-lap joints is discussed. Results from the experiment show that the load beating ability of the single-lap joint decreases as the length of the gap increase but the actual shear strength is increased in same time. After the length of the gap increasing to a certain value the load bearing ability and actual shear strength intends to decrease. It is also pointed out that the position of recessing has also remarkably effect on the strength of adhesively bonded single-lap joints, when the gap is arranged near one end of the lap zone so that the load beating ability as well as the actual strength of the single-lap joint decrease greatly. According to the result from the finite element method analysis, the stress concentration factor increases greatly when the recessing length reaches a certain value and the recessing is located near one end of the lap zone.