EXPERIMENTAL STUDIES OF NON-WEIGHING SYSTEMS OF FREIGHT CARS TAKING INTO ACCOUNT THE DEGRADATION OF MATERIAL PROPERTIES AFTER LONG-TERM OPERATION

The study investigated the influence of long-term operation on the stress-strain state and load-bearing capacity of freight car structures. Using field strain gauge tests and laboratory analysis of steels, a critical decrease in impact toughness leading to material embrittlement was established. The adequacy of the calculation model was confirmed. The results provide a basis for justifying car life extension and repair programs.