Scientific Substantiation of Thermal Leveling for Deformations in the Car Structure

Abstract

Railway transport is the foundation of the transport complex and part of the transport network of logistics chains. However, significant deterioration of rolling stock units (especially freight cars accounting for the greater part of all transportation) is an urgent problem of the rail industry. Therefore, the problems of renovation of the existing freight car fleet by developing and introducing domestic models which can effectively compete in terms of the technical and economic and operational indexes are of crucial importance. But the car structure suffers from various deformations at all service stages (production, maintenance and operation). The main type of these deformations is residual ones developing during the welding procedure, due to the thermal effect. Therefore, the issues concerning elimination of these deformations in production and maintenance are becoming ever more urgent. In particular, the most recognized and economy-oriented approach in the field is the one based on the thermal leveling of welded structures. The implementation of this approach requires some research aimed at scientific substantiation of the thermal leveling, as well as, specification of forms and heating temperatures, determination of heating form sizes, thermal leveling simulation and experimental verification of the results, optical microscopy and determination of mechanical characteristics.

Effect of technological camber in the facets of a cellular filler on its physical and mechanical characteristics

“…An effective alternative to the field tests of actual experimental samples on determining the physical and mechanical characteristics of fillers is the use of information technology involving a finite-element analysis [29,30]. Modern tools of engineering analysis make it possible to find the strained-deformed states of sandwich-type structures directly, without replacing the filler used with some solid orthotropic material, that is without its "smearing" [31,32].…”

“…14). Believing that under the considered load q=N x =N y =0, and accounting for that the cutting effort acting in the type I facet is equal to N xy =τ 1 δ, the equilibrium equation 6will take the following form: (26) By applying the Bubnov-Galerkin procedure to equation (26), we shall obtain the following equation [34]: (27) To integrate expression (27), we first derive the following integral: (28) Taking into consideration that for any integer m, n, p, q expressions sin sin sin sin 0, m n p q p = p = p = p = the integral from expression (28) is (28) will take the form (30) By computing the remaining integrals in expression (27), we obtain the following equation: (31) By recording ratio (31) for each combination of m, n, we obtain two systems of equations, one of which contains only terms with even sums m+n, the otherthe odd sums. Calculations without an initial camber show [35] that the first group of equations produces the lowest value for τ 1 .…”

Strength determination of wagon bearing structures made of round pipes at railroad ferry transportation

“…Determination of the usefulness of the joined back frame is considered in [7]. The researches have been carried out in theoretical and experimental ways on the example of a hopper wagon.…”

Determining the mechanical characteristics of composite materials reinforced with woven preforms

“…The production of polymer composite materials (PCM) is one of the fastest-growing industries in the world. In both defense and civil industries, it is impossible to imagine the creation of new equipment samples without the use of PCM [1,2].…”