摘要
以环氧树脂E44为基体,玻璃纤维为增强材料形成复合材料补片修复损伤铝合金,以端部未加约束试样为对照组,通过拉伸试验,研究了在补片端部加入约束后,补片长度和补片层数变化对修理效果的影响。研究结果表明,补片长度相同时,端部采用压条约束的修复效果明显高于端部无压条约束的修理试样,补片端部添加压条约束后,补片长度变化对修理效果的影响规律没有改变,抗拉强度随补片长度增大而增加,当补片长度达到一定值后基本不再提高,但是初始值有明显提高。此外,补片采用压条和缠绕的端部约束后,即在FRP-铝合金界面引入压应力,可改善FRP-铝合金之间的界面性能,有效缓解补片端部的应力集中。特别是当补片层数较多时,端部约束可有效改善由于补片层数增加引起的变形协调难的问题,而且缠绕约束方式的修复效果优于压条修复。
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.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2016年第2期24-28,共5页
Fiber Reinforced Plastics/Composites
基金
中国博士后基金(20110491882
2012T50875)
海军航空工程学院青岛校区发展基金
关键词
端部约束
环氧树脂
铝合金
粘接修理
end restraint
epoxy resin
aluminum alloy
bonded repair
