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Detection and Characterization of Cracks and Corrosion in Aging Aircraft Structures (Part Ⅱ)

机译：老化飞机结构中裂纹和腐蚀的检测与表征（第二部分）

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摘要

In this section we present some recent results of an experimental study of the factors determining microcrack development and the microcrack development processes in flush-riveted aluminum alloy joints. These results are taken from the wofk of Connor et al. [6]. The development of the microcracks and how they formed major propagating cracks were followed using both optical . and acoustic microscopes. While the optical microscope gives information about the specimen surface, the scanning acoustic microscope gives an image through the thickness projected onto a plane. The hidden surface of the specimen is included in the projection. Thus cracks are revealed that are not on the outer surface of the flush head riveled panel. Since cracks initiate below the outer surface of the specimen, the scanning acoustic microscope is essential to this investigation.
机译：在本节中，我们介绍一些实验研究的最新结果，这些研究决定了平铆铝合金接头中微裂纹发展和微裂纹发展过程的因素。这些结果取自Connor等人的论文。 [6]。两种光学方法都跟踪了微裂纹的发展及其如何形成主要的扩展裂纹。和声学显微镜。光学显微镜提供有关样品表面的信息，而扫描声学显微镜则通过投影到平面上的厚度提供图像。样品的隐藏表面包含在投影中。因此显示出不在平头压铆面板的外表面上的裂纹。由于在样品的外表面下方会产生裂纹，因此扫描声显微镜对于这项研究至关重要。

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