材料科学
超声波传感器
碳纤维增强聚合物
激光器
分层(地质)
话筒
超声波检测
光纤
复合材料
超声波
无损检测
联轴节(管道)
声学
光学
复合数
医学
古生物学
物理
俯冲
声压
放射科
生物
构造学
作者
Peng Song,Junyan Liu,Zhijie Li,Siyuan Wu,Xiaogang Sun,Honghao Yue,Michael Pawlak
摘要
Defects, such as delamination and debonding, are critical to the performance of carbon fiber-reinforced polymer (CFRP) composites. In recent years, non-destructive testing techniques have been improved for the inspection of these defects among CFRPs. In this study, an all-optical and non-destructive laser ultrasonic technique with an optical microphone detection module has been presented to detect the artificial subsurface defects among the CFRP composites. A finite element simulation based on the thermo-mechanical coupling model was used to study the process of nanosecond pulsed laser excitation of the CFRP laminate to produce ultrasound and the propagation behavior of ultrasound among the CFRP laminate. A series of non-contact laser ultrasonic testing experiments were carried out to study the flat bottom holes of different sizes via a laser ultrasonic detection system. The artificial subsurface defects were reliably identified by the presented all-optical laser ultrasonic system imbedded in the optical microphone using four feature images.
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