Zhang Kuanshuang, Li Shicheng, Zhou Zhenggan
Beijing Jinghang Research Institute of Computing and Communication, Beijing 100074, China.
Beijing Jinghang Research Institute of Computing and Communication, Beijing 100074, China.
Ultrasonics. 2019 Apr;94:411-418. doi: 10.1016/j.ultras.2018.06.005. Epub 2018 Jun 6.
The laser ultrasonic technique with a pulse-echo mode has been investigated to detect disbonds in a multi-layer bonded structure and a quantitative method has been proposed to evaluate the defect sizes. The simulations were carried out to analyze influences of spot sizes on the characteristics of laser ultrasonic reflected waves, the interaction of laser ultrasonic reflected waves with disbonds, and quantitative characterization on disbonds. A noncontact laser ultrasonic inspection system has been established to perform a series of experiments to verify the theoretical results. Laser ultrasonic C-scans based on reflected shear waves can clearly redraw appearances of disbonds in the adhesive bond. The proposed quantitative method can evaluate the sizes of disbonds within a reasonable error range. Moreover, the experimental data are in good agreement with the simulation results. Therefore, a combination of the laser ultrasonic pulse-echo mode and the proposed quantitative strategy is practical for accurate detection of disbonds in multi-layer bonded structures.
研究了采用脉冲回波模式的激光超声技术来检测多层粘结结构中的脱粘情况，并提出了一种定量方法来评估缺陷尺寸。进行了模拟分析光斑尺寸对激光超声反射波特性、激光超声反射波与脱粘相互作用以及脱粘定量表征的影响。建立了非接触式激光超声检测系统进行一系列实验以验证理论结果。基于反射剪切波的激光超声C扫描能够清晰地重现粘结剂粘结中脱粘的外观。所提出的定量方法能够在合理的误差范围内评估脱粘尺寸。此外，实验数据与模拟结果吻合良好。因此，激光超声脉冲回波模式与所提出的定量策略相结合对于准确检测多层粘结结构中的脱粘是切实可行的。
