碳纤维/双马来酰亚胺复合材料修复性能

为了得到碳纤维/双马来酰亚胺复合材料最佳修复效果，采用碳纤维/环氧复合材料和环氧胶膜作为修复材料，对带Φ15 mm和Φ5 mm预制孔碳纤维/双马来酰亚胺复合材料进行单面贴补、双面贴补和单面阶梯挖补修复。研究了补片长度、厚度和铺层顺序对修复效果的影响，并结合修复试样的拉伸断裂模式，优化了修复参数。结果表明：补片边缘母板中存在的应力集中和厚度方向拉伸应力是导致母板断裂的关键原因；双面贴补修复试样拉伸强度能恢复到完好试样的90%以上，单面贴补和阶梯挖补修复试样拉伸强度能恢复到完好试样的80%以上。
In order to achieve the best repairing effect of carbon fiber/bismaleimides composite materials, carbon fiber/epoxy composite materials and epoxy film adhesive were used as the repair materials to repair carbon fiber/bismaleimides composites with the pre-drilled hole of Φ15 mm and Φ5 mm, respectively. Single-lap repair, double-lap repair and step-lap repair were adopted to repair the carbon fiber/bismaleimides composite structures with pre-drilled hole. The effects of the patch numbers, patch lengths and patch stacking sequences on repairing performance were discussed. The failure model of the repaired plates was analyzed through the experimental method, and the patch-repairing parameters were optimized. The results show that the stress concentration and through-thickness tensile stress along the edges of the patch are the key reasons for the fracture of the repaired plate. The tensile strength of the double-lap repaired specimen can recover up to 90% of the strength of undrilled specimen and the strength of the specimen repaired by the single-lap repair and step-lap repair can also recover up to 80% of the undrilled specimen.