A review of the scientific and technical literature on the re-alignment of the route during the transition to high axial load from the accepted today (23.5 t/axis) to the perspective (25 t/axis) shows that in the stage of preliminary researches imitation modeling of the earth web by the finite element method (ITU) as the most convenient, accurate and illustrative of the known numerical methods. In order to provide recommendations on the strength of the subgrade when moving to a higher axial load up to 25 t/axis, an analysis was conducted, the essence of which was to compare the stress-strain state of the subgrade at two loads per axis: 23.5 t/axis (existing ) and 25 (perspective). All the geometric and deformation characteristics of the formation are taken from data on a two-track section with a height of embankment of 3. The deformation characteristics are chosen so that the working material of the formation is in accordance with the average indices of deformation capacity of the railways used. The ITU train load calculus makes it possible to obtain all the factors of VAT in it, which is the main purpose of the study of the strength of the earth cloth, and allows to forecast their development in the future.
The paper discusses the factors affecting the reliability of the welding process. Results of the analysis causes the appearance of defects and deviations from the specified mechanical properties. It is shown that one of the important factors affecting the reliability of the process of surfacing, are electric modes, whose parameters depend not only on established welding - operator, but also on the quality of the supply of electrical energy. The influence of parameters on the reliability of the process in a multilayer cladding.
In this paper we analyze existing methods for producing layered metal compositions. It is shown that the majority of the methods presented focus on the production of industrial products, billets. The use of layered metal compositions must be technically and economically justified, since they receive complicates the manufacturing (repair) process. Therefore, among the presented methods were identified, those which are most suitable for the production of railway maintenance, and shows the mechanical properties of layered materials.
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