Abstract
A technique to assess the strength and fatigue life of the welded load-bearing frame structure of a specialized slag carriage is proposed. This method provides for taking into account the specific operating modes of the carriage, which differ significantly from the operating conditions of mainline freight cars. For this car type, the fatigue life is determined by the modes associated with loading and unloading operations, as well as temperature loads acting on the bearing structure of the frame. The proposed method is based on mathematical and computer modeling of the dynamic loading of a car in operation. Dynamic loads are found on the basis of the developed solid car model. The structural strength is assessed using the finite element method. The fatigue life of the structure is estimated within the framework of a hybrid model that includes elements of low- and multi-cycle fatigue. The approbation of the technique is carried out using the example of a specialized car for transporting 16-VP slag. The results obtained confirm the operability of the studied car structure and correspond well with the results of field tests and analysis of bearing structures in operation.
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