搭接长度对复合材料单搭接胶接接头的影响

Effect of Lap Length on the Adhesive-bonded Single-lap Composite Joints

针对复合材料单搭接接头的拉伸性能进行有限元建模，分析搭接长度对单搭接接头的应力分布和破坏模式的影响。结果表明：当搭接长度在5～45mm变化时，最小剪切应力逐渐减小，当搭接长度大于20mm时，搭接长度对应力分布的影响减少；破坏载荷逐渐增大，当搭接长度大于20mm时，搭接长度对破坏载荷的影响减少；单搭接接头的破坏模式为胶层一复合材料界面的边缘发生部分损伤，导致胶层损伤，搭接长度的变化影响单搭接接头的损伤严重程度。

The tensile perfornmnce of the adhesive-bonded single-lap composite joints is studied by the finite element modeling. Effect of the lap length on the tensile properties is analyzed with respect to the stress distribution and the failure mode. It is shown that, when the lap length changes from 5ram to 45mm, the minimum shear stress gradually decreases; when the lap length is greater than 20ram, efl＇eet of the hap length on the stress distribution is decreased; the failure load increases gradually with the lap length; the increase rate is reduced when the lap length is greater than 20ram： the failure mode of a single lap joint is to start frmn the edge of the adhesive - composite interfaee, and then the adhesive damage. The lap length affects the damage level.