Longo Roberto, Vanlanduit Steve, Vanherzeele Joris, Guillaume Patrick
Department of Mechanical Engineering, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium.
Ultrasonics. 2010 Jan;50(1):76-80. doi: 10.1016/j.ultras.2009.08.001. Epub 2009 Aug 9.
The goal of non-destructive testing (NDT) is to determine the position and size of structural defects, in order to measure the quality and evaluate the safety of building materials. Most NDT techniques are rather complex, however, requiring specialized knowledge. In this article, we introduce an experimental method for crack detection that uses Surface Acoustic Waves (SAWs) and optical measurements. The method is tested on a steel beam engraved with slots of known depth. A simple model to determine the cracks size is also proposed. At the end of the article, we describe a possible application: fatigue crack sizing on a damaged slat track. This technique represents a first step toward a better understanding of the crack growth, especially in its early stages (preferably when the cracks can still be repaired) and when it is possible to assume a linear propagation of the crack front. The ultimate goal of this research program is to develop a useful method of monitoring aircraft components during fatigue testing.
无损检测（NDT）的目标是确定结构缺陷的位置和尺寸，以便测量建筑材料的质量并评估其安全性。然而，大多数无损检测技术相当复杂，需要专业知识。在本文中，我们介绍一种利用表面声波（SAW）和光学测量进行裂纹检测的实验方法。该方法在刻有已知深度槽的钢梁上进行了测试。还提出了一个确定裂纹尺寸的简单模型。在文章结尾，我们描述了一种可能的应用：受损板条轨道上的疲劳裂纹尺寸测量。这项技术代表了朝着更好地理解裂纹扩展迈出的第一步，特别是在其早期阶段（最好是在裂纹仍可修复时）以及当可以假设裂纹前沿呈线性扩展时。该研究项目的最终目标是开发一种在疲劳测试期间监测飞机部件的有用方法。
