摘要
为了研究激光冲击检测方法对“弱粘接”缺陷的检测能力,制备了不同污染水平的碳纤维复合材料粘接试件。先对试件进行拉伸剪切测试,再利用激光冲击波发生系统对其进行激光冲击,观察冲击检测结果并与拉伸剪切测试结果进行了对比。结果表明,施加污染试件拉伸剪切强度较正常粘接下降约55%~78%,失效主要发生在粘接界面处,符合“弱粘接”的特征;当激光脉宽为30 ns、光斑直径为4 mm、激光能量为3.68 J时,正常粘接试件开始产生层裂,而采用2.76 J和1.84 J的激光能量冲击能在不破坏正常粘接试件的情况下对有污染的试件造成损伤,损伤大小与试件粘接强度相关,损伤出现的位置也与拉伸剪切测试中接口断裂位置一致,说明激光冲击检测可有效识别出弱粘接缺陷。这些结果对弱粘接检测技术的发展是有帮助的。
In order to study the detection ability of the laser shock detection method for“weak bonding”defects,carbon fiber reinforced plastic(CFRP)bonding specimens with different pollution levels were prepared.Tensile shear test was performed on the specimens first,and laser shock wave generation system was used to perform laser shock on them.The impact detection results were observed and compared with the results of tensile shear test.The results show that,the tensile shear strength of the contaminated specimens decreases by about 55%~78%compared with that of normal bonding,and the failure mainly occurs at the bonding interface,which conforms to the characteristics of“weak bonding”.When the pulse width of the laser is 30 ns,the spot diameter is 4 mm,and the laser energy is 3.68 J,the normally bonded specimen begins to spalling,while the 2.76 J and 1.84 J laser energy shock can cause damage to the contaminated specimen without damaging the normally bonded specimen.The damage size is related to the bonding strength of the specimen,and the location of the damage is also consistent with the fracture location of the interface in the tensile shear test.The results indicate that laser shock detection can effectively identify weak bonding defects.This result is helpful to the development of weak bonding detection technology.
作者
曹梦雨
吴合槟
张永康
CAO Mengyu;WU Hebin;ZHANG Yongkang(Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment,Guangdong Univer-sity of Technology,Guangzhou 510006,China;School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《激光技术》
北大核心
2025年第4期495-500,共6页
Laser Technology
基金
广东省科技计划资助项目(2023B1212010012)。
关键词
激光技术
无损检测
激光冲击
碳纤维复合材料
弱粘接
laser technique
nondestructive testing
laser shock
carbon fiber reinforced plastic
weak bonding
