Sanjeev Kumar, Samir Kumar Jha, Damodar Rai, Roylen Topno, Daya Shanker Gupta, and Ramesh Chandra Thakur:
Variation in surface residual stress of C-Mn rail with usage
Residual stresses, fatigue failure, gauge corner, tensile residual stresses, rail usage, service life
With increasing service life, stresses occurring in rails show a transition from compressive to tensile nature in the gauge corner, accompanied by extensive gauge corner cracks. It is assumed that the presence of the tensile residual stresses causes the cracks to initiate and propagate. New rails, on the other hand, have tensile residual stresses in the head, generated during straightening. Rail failure during service is affected by many parameters, such as intrisic properties of rails, operational conditions and residual stresses developed before and during use. This investigation shows that residual stresses in the head centre transform from tensile to compressive during use, but there is a possibility that deep inside the head, tensile residual stresses remain which may cause fatigue failure. Residual stresses at the foot centre generally decrease with increasing GMT (gross metric ton).
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