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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >FATIGUE CRACK DETECTION IN METALLIC MEMBERS USING SPECTRAL ANALYSIS OF ULTRASONIC RAYLEIGH WAVES
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FATIGUE CRACK DETECTION IN METALLIC MEMBERS USING SPECTRAL ANALYSIS OF ULTRASONIC RAYLEIGH WAVES

机译：超声瑞利波谱分析的金属构件疲劳裂纹检测

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摘要

This study shows that Rayleigh waves can be effectively used for detecting fatigue cracks in metallic members. The use of spectral analysis in detecting these cracks has been illustrated in this paper using examples of aluminum beams and steel plates. Spectral analysis can be conducted on signals from both direct-transmission and pulse-echo modes. The proposed procedure was successfully used to detect cracks in both unpainted and painted members. For field applications, rapid scanning of long members can be achieved using direct-transmission tests. Any member which shows a significant loss in the received signal energy compared to other members with the same travel distance can then be tested in the pulse-echo mode over shorter travel distances to determine the location and severity of the cracks.
机译：这项研究表明，瑞利波可以有效地用于检测金属构件中的疲劳裂纹。本文以铝梁和钢板为例说明了光谱分析在检测这些裂纹中的应用。可以对来自直接传输模式和脉冲回波模式的信号进行频谱分析。所提出的程序已成功用于检测未上漆和已上漆的构件中的裂纹。对于现场应用，可以使用直接传输测试来快速扫描长成员。然后，与具有相同行进距离的其他成员相比，在接收信号能量中显示出明显损失的任何成员，都可以在较短的行进距离上以脉冲回波模式进行测试，以确定裂纹的位置和严重程度。

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