OJMetal  Vol.2 No.3 , September 2012
Modeling Stress Intensity Factor of Rail Steel under Situation of Growing Fatigue Crack—A Novel Technique
Author(s) Upamanyu Banerjee*
ABSTRACT
Simulation of stress intensity factor as function of rolling contact fatigue cracks of railway tracks and the vehicle load is made with the help of COMSOL Multiphysics software. It is found that the critical stress intensity factor i.e. 41.6 MPa. m1/2 is reached at a stress level of 32 MPa and at the crack size 11.5 × 10-2 m.Noting the power law variation of acoustic emission count with increase in crack size (analogous to Paris Law), the simulation was further carried out to model the dependence of measured AE count with the stress intensity factor ahead of a growing RCF crack tip. It is demonstrated that AE measurement can be effective to trigger a control loop for avoidance of fatigue failure of railway track. In view of potential difference in the intensity of back scattered light from surface irregularities, a model is developed to find out the threshold intensity of scattered light that insures safety in the railway system against fatigue failure.

Cite this paper
U. Banerjee, "Modeling Stress Intensity Factor of Rail Steel under Situation of Growing Fatigue Crack—A Novel Technique," Open Journal of Metal, Vol. 2 No. 3, 2012, pp. 74-78. doi: 10.4236/ojmetal.2012.23011.
References
[1]   G. Chattopadhyay, D. Raman and M. R. Alam, “A Study of Derailment in Australia-Analyzing Risk Gap with Data Monitoring,” Proceedings of the 6th World Congress on Engineering Asset Management, Springer, Duke Energy Center, Cincinatti, 3 October 2011, p. 104.

[2]   R. J. Greene, J. R. Yates and E. A. Patterson, “Rail Crack Detection: An Infrared Approach to In-Service Track Monitoring,” Proceeding of SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Saint Louis, 4-7 June 2006, pp. 741-748.

[3]   R. J. Greene, J. R. Yates and E. A. Patterson, “In-Service Fatigue Crack Detection of Rail Using Thermal Techniques,” Proceeding of 9th International Conference on Fatigue, Atlanta, 14-19 May 2006, pp. 1-8.

[4]   E. Magel, P. Sroba, K. Sawley and J. Kalousek, “Control of Rolling Contact Fatigue of Rails,” Proceedings of the ARAMA Annual Conference, Nashville, 19-22 September 2004, pp. 1-29.

[5]   S. Mellings, J. Baynham and R. A. Adey, “Automatic Crack Growth Prediction in Rails with BEM,” Engineering Fracture Mechanics, Vol. 72, No. 2, 2005, pp. 309-318.

[6]   H. A. Aglan and M. Fateh, “Fracture Damage Tolerance of Bainitic and Pearlitic Rail Steels,” International Journal of Damage Mechanics, Vol. 15, No. 4, 2006, pp. 393410. doi:10.1177/1056789506060775

[7]   H. A. Aglan and M. Fateh, “Fracture and Fatigue Crack Growth Analysis of Rail Steels,” Journal of Mechanics of Materials and Structures, Mathematical Sciences Publishers, Vol. 2, No. 2, 2007, pp. 335-346.

[8]   G. E. Dieter, “Mechanical Metallurgy,” 3rd Edition, McGraw-Hill, New York, 1961.

[9]   M. N. Bassim, S. St. Lawrence and C. D. Liu, “Detection of the Onset of Fatigue Crack Growth in Rail Steels Using Acoustic Emission,” Engineering Fracture Mechanics, Vol. 47, No. 2, 1994, pp. 207-214. doi:10.1016/0013-7944(94)90221-6

[10]   S. Tarafder, “Fracture Mechanics Concepts for Component Integrity Evaluation,” Proceedings of the Disscet ’98, BHU, Varanasi, 5-7 November 1998, pp 2-5.

[11]   D. Fang and A. Berkovits, “Fatigue Design Model Based on Damage Mechanism Revealed by Acoustic Emission Measurements,” Journal of Engineering Materials and Technology, Vol. 117, No. 2, 1995, pp. 200-208.

[12]   M. S. Zain, N. Jamaludin, Z. Sajuri, M. F. M. Yusof and Z. H. Hanafi, “Acoustic Emission Study of fatigue Crack Growth in Rail Track Material,” National Conference in Mechanical Engineering Research and Postgraduate Studies (2nd NCMER 2010), Kuantan, 3-4 December 2010, pp. 82-90.

[13]   U. Banerjee, D. Bhadra, S. Dongre, A. Sinha and A. Sharma, “Modeling a Rail Crack Detection System,” B. Tech. Thesis, National Institute of Technology, Tiruchchirappalli, 2012 (Unpublished).

 
 
Top