An oblique surface crack in rail under wheel-rail full slip contact loading and factional heating is analyzed by finite element simulations. In the present thermo-mcchanical coupling finite element model, the heat-convection between the rail and ambient, heat transfer between the crack surfaces, and temperature-dependent material properties are taken into consideration. The effects of the frictional coefficients of wheel-rail contact and crack surfaces and the crack orientation on the stress intensity factors are investigated. The results reveal that the values of stress intensity factors K5 and K2 obtained by the thermo-mechanical coupling simulation are lower than those by the only mechanical simulation. But the value of the stress intensity factor range AK2 for the former is higher. Reducing the wheel-rail contact surface frictional coefficient, increasing the crack-face frictional coefficient and avoiding the small angle of crack can restrict the rail surface crack growth.
Finite element analysis of thermo-mechanical contact fatigue crack in rail
2009
6 Seiten, 8 Bilder, 1 Tabelle, 21 Quellen
Conference paper
English
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