Anchoring Screws Health Detecting and Measures to Prevent Fracture

Chongqing Light Rail is one of the main transport facilities. Anchoring screws are the important parts to connect Light-Rail's girders and piers. Their health directly affects the safety of Light-Rail operations. This paper describes a health monitoring system which uses NDT technology to test the Light-Rail anchoring screws in service. It can detect the state and internal defects of anchoring screws. Based on these test results, the service capacities of the anchoring screws are valuated. When the system were detecting them, a few anchoring screws were found of breakage failures, and afterwards these discoveries were confirmed by artificial examination. In order to further investigate the reasons for breaking the anchoring screws and eliminate safety hazards, we built ANSYS finite element models of anchoring screws and girders of the Light-Rail and calculated their dynamic responses under various operating conditions. For these faulty anchoring screws, we made the metallographic tests. Through computational analysis and metallographic analysis, we found the reasons of fracture, and proposed measures to prevent breakage.

References

1. ZHANG Shi-hong. “Present Situation of Straddle-type Monorail Traffic System and Health Monitoring of Anchor Screws,” Journal of Chongqing Technology Institute (Natural Science Edition), 2007, Vol. 21, No. 7, pp. 41-44. 2. XIE Wei-chun and YE Jun-yong. “A Light-Rail’s Anchoring Screws Health Monitoring System Based on Ultrasonic,” Microcomputer Information, 2010, Vol. 26, No. 12-1, pp. 106-108. 3. Li Guohua and Wu miao. Modern Non-destructive Testing and Evaluation, Beijing, Chemical Industry Press, 2009. 4. Liu Kai. “Correct Choice and Use of Longitudinal Wave Dual-crystal Probe,” NDT, 2005, Vol. 29, No. 2, pp. 29-32. 5. Xiong Xiaowei. “Application of Dual-crystal Straight Probe in Ultrasonic Flaw Detection of Plate,” WIDE AND HEAVY PLATE, 2003, Vol. 9, No. 2, pp. 19-22. 6. Hai Liang. “Using Dual-crystal Probe Distance and Amplitude Characteristic Curve to Assess the Reflecting Signals of Defects in Middle Thick Titanium Plate,” NDT, 2003, Vol. 27, No. 3, pp. 42-43. 7. Lin Li and Li Ximeng. Ultrasonic Spectrum Analysis Technology and Its Application, Beijing, CHINA MACHINE PRESS, 2009. 8. GB/T10561-2005 Determination of Non-metallic Inclusions Content in Steel –Standard Rating Diagram Microscopic Inspection Method, Beijing, CHINA STANDARD PRESS, 2005. 9. GB/T 13299-1991 Steel--Determination of Microstructure, China Standard Material Network, http: //www. gbw114.org/. 10. GB/T 6394-2002 Metal-Methods for Estimating the Average Grain Size, Beijing, CHINA STANDARD PRESS, 2003

Metrics
Usage Shares
Total Views
8 Page Views
Total Shares
0 Tweets
8
0 PDF Downloads
0
0 Facebook Shares
Total Usage
8