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首页> 外文会议>American Society for Nondestructive Testing(ASNT) Fall Conference amp; Quality Testing Show: Paper Summaries; 20041115-19; Las Vegas,NV(US) >Imaging of Lap-Splice Fatigue Cracks using High Frequency Ultrasound
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Imaging of Lap-Splice Fatigue Cracks using High Frequency Ultrasound

机译：搭接接头疲劳裂纹的高频超声成像

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摘要

The use of a high frequency, linear array imaging system to inspect for fatigue cracks in aircraft lap-joints is presented. The system produces images in real-time allowing inspectors to quickly and accurately identify rivet features and, if present, associated defects. The images can also be used to estimate crack length. The performance of this system was tested at the FAA/AANC test facility by participating in the inner-layer, blind POD study. Sixteen panels were imaged from the top (outside) surface of the bottom skin . The inspections of each panel (20 rivets) was accomplished in 120 to 150 seconds. This time includes a scan of all the sites with a return (confirmatory) inspection of those sites where calls had been made. Using this system, inspectors were able to detect cracks 0.040" in length at the 90/95% confidence level while maintaining a false-call rate of only 1.3 % (7/525). Only 3 rivets with actual defects were missed and these cracks were 0.028" in length or less.
机译：介绍了使用高频线性阵列成像系统检查飞机搭接处的疲劳裂纹。该系统实时生成图像，使检查员可以快速，准确地识别铆钉特征以及相关缺陷（如果存在）。这些图像还可用于估计裂纹长度。通过参与内层盲POD研究，在FAA / AANC测试设备上对该系统的性能进行了测试。从底部皮肤的顶部（外部）表面成像了16个面板。每个面板（20个铆钉）的检查在120到150秒内完成。这次包括对所有站点进行扫描，并对发出呼叫的那些站点进行返回（确认）检查。使用此系统，检查人员能够在90/95％的置信度下检测到0.040“长度的裂纹，同时将误检率保持为1.3％（7/525）。只有3个实际缺陷的铆钉被漏掉了，这些裂纹长度不超过0.028英寸。

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