关键词: 端部约束, 环氧树脂, 铝合金, 粘接修理

Abstract: With epoxy resin as matrix and glass fiber as reinforcing material to form composite patch to repair damage to aluminum alloy, the comparisons were taken without end restraint. Through tensile experiment, the effects on repairing effect with the change of length and layers of the patch were studied after adding constraints at the end of the patch. The experimental results show that the repair effect of layering constraint was obviously higher than that without layering constraint under the same length of patch. At the same time, the rules of the change of the patch to repair effect has not changed after the constraint. Tensile strength increases with the increase of the patch length. When the patch length reaches a certain value, the tensile strength no longer increased, but the initial value has increased significantly. After adopting layering and winding constraint, compressive stress was taken in the interface of FRP-aluminum alloy, the performance of the interface between FRP and aluminum alloy was improved, and the stress concentration of the patch ends was alleviated. Especially, when the patch layer is large, end constraint can effectively improve the difficulty of coordination caused by the increase of layer patch, and winding constraint repair effect is superior to layer constraint.

Key words: end restraint, epoxy resin, aluminum alloy, bonded repair