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界面是研究复合材料的重中之重,界面的性能在很大程度上决定了复合材料的性能。本文研究了通过电阻加热修复碳纤维增强热塑性树脂基复合材料的界面,这种方法直接加热受损的界面区域,使得碳纤维附近界面区域的聚醚酰亚胺树脂熔化,熔化后的树脂与碳纤维重新浸润,当撤去电流后树脂固化形成新的界面,真正的做到了界面修复。本文通过扫描电镜及界面剪切强度测试表征受损前后的界面形貌与剪切强度,通过对比我们可以证实通过通电加热可以修复碳纤维增强聚醚酰亚胺复合材料的界面,并且修复效率可高达94.3%。实验结果表明,只有当通过纤维的电流大于4mA时界面才可以得到修复,其中当电流为6mA时修复效率达到最高。本实验同时还证实了通电修复法可以多次修复受损的界面,同时保证界面剪切强度下降很小。
Interface is the most important research composite materials, the performance of the interface to a large extent determines the performance of the composite material. In this paper, the interface of carbon fiber reinforced thermoplastic resin matrix composites is repaired by electrical resistance heating. This method directly heats the damaged interface region, so that the polyetherimide resin in the interface region near the carbon fiber melts, and the melted resin and carbon fiber re-infiltrate , When removed after the current curing resin to form a new interface, the real interface repaired. In this paper, the interface morphology and shear strength before and after damage were characterized by scanning electron microscopy and interfacial shear strength testing. By comparison we can confirm that the interface of carbon fiber reinforced polyetherimide composites can be repaired by electrification and the efficiency of repair can be up to 94.3%. The experimental results show that the interface can be repaired only when the current through the fiber is larger than 4mA, and the repair efficiency reaches the highest when the current is 6mA. The experiment also confirmed that the electrification repair method can repair the damaged interface many times, and at the same time, it can ensure that the interfacial shear strength decreases little.