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MECHANICAL BEHAVIOR OF A SUPPORTING STRUCTURE OF A FREIGHT RAILROAD CAR
Abstract
The growth in economy is reflected also in the rising demand for freight transportation. The freight railroad industry play an important role being a mainstay of transportation for basic industries. New projects are currently developed for increasing the capacity of transportation by rail from large coal and mineral basins to the places of consumption or within the processing plants. The combined heavy load and usage cycles imposes severe stresses on the components of the freight cars. To this purpose a comparative study of the mechanical behavior of a prototype of a supporting structure of an oversized special freight rail car was carried out. A stress analysis performed through computational simulation and through experimental testing techniques is presented in this paper. A preliminary study using the brittle lacquer technique on a model at a scale 1:6 of the supporting structure of the car emphasized the most stressed areas and enable further to perform strain gage measurements on the real structure in these regions.The results obtained using the three-dimensional finite element method and the experimental techniques were compared and a good agreeement between calculated and measured values was noticed.The strain and stress analysis of this prototype of a supporting structure should find important use for the correction of its geometry, for a new proper design, more reliable, and for ensuring a safe exploitation of special oversized loaded freight rail cars.
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References8
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