Arbuzov M. Improvement of the monitoring system of the longitudinal stress in long welded rails

The analysis of various methods of measurement of mechanical stress has been executed. It has been established, that the magnetic method is a perspective quality monitoring. The degree of influence of mechanical stress, temperatures of metal, training of metal, a chemical compound and intensity of a magnetic field is experimentally established on magnetic properties of rail steel. Factor of proportionality between magnetic permeability of rail steel and a stress became possible not only to determine, but also to predict. The magnetic method is applied for definition of neutral temperature of long welded rails. The device for definition of neutral temperature is developed and made on the basis of laboratory researches of magnetic properties of rail steel. The mathematical spatial model of work long welded track is developed. This model takes into account influence of the horizontal and vertical bending moments, change of forces of resistance to horizontal moving at occurrence of vertical moving takes into account, the model of distribution of temperature on cross-section section of a rail and on section of a rail includes model of distribution of internal longitudinal stress. Places of measurement of total longitudinal stress are determined with the help of this spatial model. The technique of measurement of mechanical stress and a technique of measurement of neutral temperature in long welded rails is developed.