老化环境对碳纤维增强聚醚酰亚胺树脂基复合材料超声焊接头性能的影响

Effects of Aging Environment on Ultrasonic Welding Joint Properties of Carbon Fiber Reinforced Polyether Imide Resin Matrix Composites

超声焊接技术因其高效、环保被认为是复合材料连接的有效方式之一。复合材料超声焊接头在不同使用环境中可能会存在一定的老化效应。文中以碳纤维增强聚醚酰亚胺复合材料(CF/PEI)超声焊接头作为研究对象,采用单搭接剪切强度(LSS)和接头破坏形貌的扫描电子显微镜观察的方法对CF/PEI复合材料超声焊接头在高温、水煮和湿热环境中的老化性能进行了评估。研究结果表明,复合材料超声焊接头单搭接剪切强度在较高温度时(110~170℃)存放5 h、吸水率在1%以上及湿热环境中(30℃,湿度50%)存放不同时间(5~15 d)后均出现明显下降。

Ultrasonic welding is considered to be one of the effective ways to join composite materials because of their high efficiency and environmental protection.The ultrasonic welded joint of composite materials may have certain aging effect in different use environments.In this study,the ultrasonic welded joint of carbon fiber reinforced polyetherimide composite(CF/PEI)was taken as the research object.The aging performance of CF/PEI composite ultrasonic welded joint was evaluated by scanning electron microscopy(SEM)observation of single lapping shear strength(LSS)and joint failure morphology in high temperature,boiling and humid heat environment.The results show that the single lap shear strength of the ultrasonic welded joint decreases significantly after storage at a high temperature(110~170℃)for 5 h,water absorption above 1%,and storage in a hot and humid environment(30℃,humidity of 50%)for different periods(5~15 d).