Liu Yuan
College of Logistics Engineering, Shanghai Maritime University, 201306, China
Chao Mi
Container Supply Chain Technology Engineering Research Center, Shanghai Maritime University, 201306, China
ABSTRACT
With the existence of a new rail crack near the old one, the load distribution would be modified at the rail surface and when the new crack was of different sizes, it would affect the propagation trend of the old crack to different extent. In this study, simulations of multiple cracks growth in rail under Rolling Contact Fatigue (RCF) were presented based on a 3D finite element model. More specifically, the focus was on the calculation of the stress intensity factors at the crack tip fronts of short surface cracks. A fatigue crack propagation model was expressed in terms of stress intensity factor and the material characteristic of the rail to estimate the crack propagation direction and propagation rate. The results showed that with the increase of the new crack size, the propagation rate of the old crack would be decreased both at its surface and at certain depth and the propagation direction of the old crack would bend to the new crack at the rail surface which might cause the old crack to join the new one into a bigger crack and result in a higher propagation rate.
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How to cite this article
Liu Yuan and Chao Mi, 2013. Influence of Crack Size on the Propagation Trend of Multiple Rail Surface Cracks under Rolling Contact Fatigue. Journal of Applied Sciences, 13: 4046-4051.
DOI: 10.3923/jas.2013.4046.4051
URL: https://scialert.net/abstract/?doi=jas.2013.4046.4051
DOI: 10.3923/jas.2013.4046.4051
URL: https://scialert.net/abstract/?doi=jas.2013.4046.4051
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