中国激光, 2019, 46 (2): 0204009, 网络出版: 2019-05-09
光热调制裂纹闭合的激光超声实时监测 
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Laser Ultrasonic Real-Time Monitoring of Photothermal Modulation Crack Closure
测量 激光超声 无损检测 声表面波 峰峰值 measurement laser induced ultrasonic nondestructive testing surface acoustic wave peak-to-peak value
摘要
基于激光超声方法,对裂纹在加热光辐照及自然冷却条件下的透射超声信号进行了实时监测。在不同功率加热光辐照下,得到了裂纹壁上的突起在裂纹受加热光辐照闭合时的三种典型的变化过程,对所产生的三种典型的变化过程的成因进行了分析与讨论。研究结果表明,裂纹在加热光辐照及自然冷却条件下的变化均与裂纹在未加热时的初始形貌特征有关。
Abstract
Based on the laser ultrasonic method, the transmitted ultrasonic signals are monitored in real-time when the crack is irradiated with a heating laser and naturally cooled. Under the irradiation of different power heating laser, three typical processes of the crack wall asperities are obtained when the crack is closed by the irradiation of heating laser, and the causes of these different processes are analyzed and discussed. The results show that the change of crack under heating laser irradiation and natural cooling condition is related to the initial morphology characteristics of the crack when it is not heated.
尤博文, 倪辰荫, 沈中华. 光热调制裂纹闭合的激光超声实时监测[J]. 中国激光, 2019, 46(2): 0204009. Bowen You, Chenyin Ni, Zhonghua Shen. Laser Ultrasonic Real-Time Monitoring of Photothermal Modulation Crack Closure[J]. Chinese Journal of Lasers, 2019, 46(2): 0204009.
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