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RESIDUAL STRESS EVALUATION OF RAILWAY RAILS

Various stresses add to the railway rails and accumulate fatigue damage due to daily use. Fracture mechanics clarification concerning the growth behavior of cracks is needed, in order to decide the inspection period and the cycle [1], [2] . Though the crack progression and influence of residual stress on fatigue strength has been researched [3] for many years, they are not clear now. The aims of this research are the assistance of the inspection period and the cycle decision of the rail maintenance. For these purposes, the residual stress distribution in the railway rails was measured by using the X-ray diffraction method, the strain gauge method and FEM analysis respectively.