چكيده به لاتين
Crack (stress intensity factor and the level of disruption) in the rail transport industry has always been important for researchers. Among the factors influencing the transverse fatigue cracks is more important. In this thesis, one of the factors that create and growth of cracks in the rails have been studied. And the issue was resolved two-dimensional and three-dimensional mode and the results were compared and the impact of the working fluid was observed on the stress intensity factor. The study involved many factors including the spread and growth of cracks coefficient of friction between the wheels and rails, size, depth and angle is left. Among the features of this study may be left modeling in the field of plastic and partly Angle cited publication. Because of the complexity of the material and geometric non-linear behavior and dynamic boundary conditions at the end of a specialized software to analyze Abaqus finite element is used. With this software while performing stress analysis for wheel positions, different levels of the stress intensity factor and integral J is obtained. The results show that Jay has been integral to the development of independent and leave the stress intensity factors depends first and second.In this paper It is clear that the rails matched with the angle from horizontal to vertical crack, crack deviation from its initial direction increases. In this thesis, the effect of the stress intensity factor according to speed and load changes took that In both cases, the graph shown in ascending order of the load and speed to increase the amount of stress intensity factor increases. The force of the stress intensity factor near the crack was examined by the working fluidThe first mode is shown in the left increases and the second mode before the crack tip increases. With the increase in absolute value than the first and second stress intensity factors in the crack tip fracture along the crack path from initial increase, As far as slip between the cracks of the lost funds.