Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 28, No. 12 (December 2015) 1782-1789   

PDF URL: http://www.ije.ir/Vol28/No12/C/11-2142.pdf  
downloaded Downloaded: 183   viewed Viewed: 1775

  HEALTH MONITORING OF WELDED STEEL PIPES BY VIBRATION ANALYSIS
 
A. A. Hassan, M. S. EL-Wazery and S. H. Zoalfakar
 
( Received: May 25, 2015 – Accepted: October 16, 2015 )
 
 

Abstract    In the present work, structure health monitoring (SHM) of welded steel pipes was used to diagnosis their state via vibration based damage detection techniques. The dynamic quantities such as Frequency Response Functions (FRFs), mode shapes and modal parameters from structural vibration to detect damage were measured, set on linear averaging mode, with a maximum frequency of analysis of 3.2 kHz. Two most commonly used welding techniques were used, namely: shielded metal arc welding (SMAW) and gas tungsten arc welding (GTAW). Static tests were performed to assure the quality of welded steel pipes such as three point bending test (3PB), face bending, and tensile testing. In addition, X- ray, liquid penetration inspection methods were utilized as a NDT. The results show for non-cracked pipes, the first three modes, the higher the damping frequency and lower the damping ratio. This reflects the difficulty of dissipating energy at higher frequency. Also, it was found that SMAW to give higher damping ratio (7.418%) as compared with GTAW joints (7.220). So, the latter joints have higher stiffness than the former ones. However, cracked pipes welded lay 85 A seem to are highest damping for all the tested pipes (8.110%). The results demonstrated that the FRFs technique is a potentially powerful tool for damage detection, health monitoring of welded steel structural pipes

 

Keywords    Keywords: Structure health monitoring (SHM), welded steel pipes, Frequency Response Functions (FRFs). shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), three point bending (3PB).

 

چکیده    در کار حاضر نظارت بر سلامت ساختار (SHM) لولههای فولادی از طریق روش ارزیابی آسیب جوش بر مبنای ارتعاش برای تشخیص وضعیت جوش استفاده شده است. کمیتهای پویا از قبیل عملکردهای پاسخ فرکانس (FRF))، شکل و حالت پارامترهای ارتعاش ساختاری برای شناسایی آسیب ها ، در حالت میانگین خطی با تحليل از حداکثر فرکانس 3.2 کیلوهرتز اندازه گیری شدند. در این پژوهش از دو روش جوشكاری يعنى: (SMAW) و (GTAW) استفاده شد، به منظور ارزیابی کیفیت جوش از آزمونهای ایستا استفاده شد. این آزمونها خم کردن سه نقطهای، خم کردن سطحی، و كشش محوری بودند. به علاوه، عکس برداری با پرتو ایکس به عنوان يك روشNDT نیز به كار گرفته شد.

References   

 

1.        D. Balageas, C. P. Fritzen, and A. Guemes. Structural Health Monitoring:. ISTE Ltd, London, UK, (2006).

2.        C. Boller. Next generation structural health monitoring and its integration into aircraft design, International Journal of Systems Science, 31(11) , (2000),1333-1349.

3.        R. P. Dalton, P. Cawley, and M. J. S. Lowe. Propagation of acoustic emission signals in metallic fuselage structure. IEE Proc.-Sci. Meas. Technol., 148(4) , (2001), 169-177.

4.         R. P. Dalton, P. Cawley, and M. J. S. Lowe. The potential of guided waves for monitoring large areas of metallic aircraft fuselage structure. Journal of Nondestructive Evaluation, 20(1) , (2001), 29-46.

5.        Cawley, P., "Long range inspection of structures using low frequency ultrasound", Structural Damage Assessment Using Advanced Signal Processing Procedures, (1997), 1-17.

6.        Katafygiotis, L. and Lam, H., "A probabilistic approach to structural health monitoring using dynamic data", Structural health monitoring, current status and perspectives, (1997), 152-163.

7.        Burton, T., Farrar, C. and Doebling, S., "Two methods for model updating using damage ritz vectors", in SPIE proceedings series, Society of Photo-Optical Instrumentation Engineers, (1998), 973-979.

8.        Karthik, G., Karuppuswamy, P. and Amarnath, V., "Comparative evaluation of mechanical properties and micro structural characteristics of 304 stainless steel weldments in tig and smaw welding processes", International Journal of Current Engineering and Technology, (2014), 200-206.

9.        Talabi, S., Owolabi, O., Adebisi, J. and Yahaya, T., "Effect of welding variables on mechanical properties of low carbon steel welded joint", Advances in Production Engineering & Management, (2014), 181-186.

10.     Groover, M.P., "Fundamentals of modern manufacturing: Materials processes, and systems, John Wiley & Sons,  (2007).

11.     Parmar, R., Welding processes and technology. 1995, Khanna Publishers, Delhi.

12.     Kim, W.G., Park, J.Y., Lee, H.-Y., Hong, S.-D., Kim, Y.-W. and Kim, S.J., "Time-dependent crack growth behavior for a smaw weldment of gr. 91 steel", International Journal of Pressure Vessels and Piping,  Vol. 110, (2013), 66-71.

13.       Wang, Q., Sun, D., Na, Y., Zhou, Y., Han, X. and Wang, J., "Effects of tig welding parameters on morphology and mechanical properties of welded joint of ni-base superalloy", Procedia Engineering,  Vol. 10 (2011), 37-41.

 


Download PDF 



International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir