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

机译：老化飞机结构中裂纹和腐蚀的检测与表征（第一部分）

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This paper describes some nondestructive testing techniques to detect potential causes of structural failure of aging aircraft, such as cracks and corrosion. The techniques include ultrasonics, both with contact transducers and in a non-contact modality using laser-based ultrasonics. A system for detection of corrosion in the layered structure of the DC-9 wingbox, based on the use of contact transducers on the wing skin surface, is highlighted. X-ray backscattering depth profilometry to assess second-layer corrosion in fuselage structures is discussed in some detail. The propagation of fatigue cracks emanating from rivet holes has been studied, and results on crack initiation and propagation are presented. Acoustic microscopy has been used to image surface breaking and subsurface cracks near rivet holes.
机译：本文介绍了一些非破坏性测试技术，以检测飞机老化导致结构失效的潜在原因，例如裂缝和腐蚀。这些技术包括超声波，既可以使用接触式换能器，也可以使用基于激光的超声波以非接触方式使用。着重介绍了一种基于机翼蒙皮表面接触传感器的使用来检测DC-9机翼盒的分层结构中腐蚀的系统。详细讨论了用于评估机身结构中第二层腐蚀的X射线反向散射深度轮廓仪。研究了由铆钉孔产生的疲劳裂纹的扩展，并给出了裂纹萌生和扩展的结果。声学显微镜已被用来成像铆钉孔附近的表面破裂和亚表面裂纹。

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