Characterization of thermal damage in sandstone using the second harmonic generation of standing waves

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• 作者：Jun Chen^a ; ^{junchen@buaa.edu.cn} ; Tingyuan Yin^a ; Jin-Yeon Kim^b ; ^{jinyeon.kim@me.gatech.edu} ; Zheng Xu^a ; Yangping Yao^a
• 关键词：Sandstone ; Thermal damage ; Nonlinear ultrasonic method ; Second harmonic generation ; Standing waves
• 刊名：International Journal of Rock Mechanics and Mining Sciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：91
• 期：Complete
• 页码：81-89
• 全文大小：1171 K
• 卷排序：91

文摘

The sensitivity of second harmonic method is one order higher than ultrasonic pulse velocity method. Nonlinear parameter presents an accelerated increase after the temperature is over 200 ℃. The reverse change of parameters between100  ℃ and 150 ℃ may be caused by the filling of pre-existing microcracks. The non-resonant standing waves can be used in the second harmonic generation technique as the propagating waves.