当前位置: X-MOL 学术NDT E Int. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Laser ultrasonics for defect evaluation on coated railway axles
NDT & E International ( IF 4.2 ) Pub Date : 2020-06-09 , DOI: 10.1016/j.ndteint.2020.102321
Nicola Montinaro , Gabriella Epasto , Donatella Cerniglia , Eugenio Guglielmino

This scientific paper focuses on the application of an advanced non-destructive technique for an effective inspection of railway axles. The method pertains to ultrasonic techniques, which are widely used in the railway field. The experimental investigation was carried out on simulated defects tooled near the cross section reduction of the axle, in order to simulate fatigue cracks which, due to notch effect, can trigger crack propagation and axle failure.

The aim of this research activity is to evaluate how efficiently the proposed technique detects defects and to verify its applicability to axles with a black coating for protection. In view of the experimental setup, comprising a pulsed laser for ultrasonic waves generation and a continuous beam laser plus an interferometer as the receiving unit to measure surface displacements, the presence of a black coating represents a major challenge in terms of signal detection. Nonetheless, defects were detected by collecting all the waves in a B-scan map and data were processed by cross-reading A-scans and B-Scans in correspondence of each defect analysed. Results of the analysis show how very promising and robust the application of the proposed laser ultrasonics technique is in defect detection on painted railway axles.



中文翻译:

激光超声用于涂层铁路轴的缺陷评估

该科学论文集中于先进无损技术在铁路车轴有效检查中的应用。该方法涉及在铁路领域中广泛使用的超声技术。为了模拟疲劳裂纹,该疲劳裂纹由于缺口效应而可能触发裂纹扩展和轴故障,因此对在轴横截面减小附近使用工具模拟的缺陷进行了实验研究。

这项研究活动的目的是评估所提出的技术检测缺陷的效率,并验证其是否适用于带有黑色涂层的车轴以提供保护。考虑到实验装置,包括用于产生超声波的脉冲激光器和连续光束激光器以及作为测量表面位移的接收单元的干涉仪,黑色涂层的存在代表了信号检测方面的主要挑战。但是,通过将所有波收集在B扫描图中来检测缺陷,并通过交叉读取A扫描和B扫描来处理数据,以对应分析的每个缺陷。分析结果表明,所提出的激光超声技术在涂漆铁路车轴缺陷检测中的应用前景非常好且非常可靠。

更新日期:2020-06-09
down
wechat
bug