The Purpose of this work is to determine the effect of a dent on the stress state of the wheel at different rim thicknesses. The article uses methods of numerical solution of partial differential equations (finite element method) to determine the stress state in the contact “wheel-rail” at different thickness of the rim with a chink and without a chink. Based on the research, proposals have been developed to change the norms of rejection of wheels with a thin rim in the presence of a dent on the surface of the ride. Changing the norms of rejection of wheels with a thin rim in the presence of a dent on the surface of the ride will increase the resource of the wheels and thereby reduce the need for new wheels.
Целью работы является определение влияния выщербины на напряженное состояние колеса различной толщины обода. В статье используются численные методы решения дифференциальных уравнений отдельных производных (метод конечных элементов) для определения напряженного положения на стыке «колесо-рельс» при различной толщине обода с выщербиной и без выщербины. На основе проведенных исследований были выработаны рекомендации по изменению норм брака колес с тонкими кромками при наличии выщербины на поверхности скольжения. Изменение норм брака с тонкой кромкой колес позволит увеличить ресурс колес при наличии выщербины на поверхности скольжения и тем самым снизить потребность новых колес.
Objective: study of the stress-strain state of the wheel pair of a freight car in the process braking. Methods: to determine the stress-strain state of the wheel pairs of a freight car. Results: A volumetric finite element model of a wheel pair with rail sections was created using a finite element of the ten knot tetrahedron type, and maximum shear stresses and maximum equivalent stresses were determined according to the Mises and Dang Wan theory. Practical significance: It is shown that the maximum tangential stresses are observed at a point located at a depth of 4.5-5.3 mm below the rolling surface of the wheel. In case of emergency (short) braking, maximum stresses occur on the rolling surface of the wheel. During prolonged braking (movement of the train along a prolonged descent), maximum stresses occur at the point of transition from the disk to the rim on the inner side of the wheel, and the magnitude of these stresses is 2.5 times higher than in the emergency braking mode.
Purpose: To review algorithm methodology for the addition of a new material to Qform Heat Treatment Module database with further adequacy assessment of the model by the method of the comparison its microhardness distribution with experimental data. Methods: Technique for the modeling of heat treatment (hardening) of samples from steels 60 and 40Cr in QFORM Heat Treatment software module has been developed. Algorithm for new material addition into software package database with adequacy further assessment for built model by the method of comparison of obtained data on distribution of microhardness over a section while process modeling in Qform with laboratory experiment data is presented. Results: Models of hardness distribution over the diametrical section of hardened cylindrical samples from steel 60 and adapted steel 40X, built into QFORM Heat treatment database. Comparison of modeling results with experimental data on hardness distribution of hardened samples. Practical significance: The results, obtained in this work, represent algorithm for replenishing the database of Qform Heat Treatment Module, created for the purpose to carry out heat treatment procedures for steels and nonferrous alloys. During experiment pursuing, it was established that the model of added to the database material demonstrates adequacy high degree. The expansion of the database of given materials of the given Module will allow its widespread application in the industries which activities are related to heat treatment.
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