engleski

Analyses of Fractures that have Caused Traffic Accidents

The paper analyses some fractures of vehicle components which have caused traffic accidents. The methods of analysing the cause of fracture have been described, as well as the main types of fractures. The first analysed cause of a fracture is the excessively rough machine finish which leaves cracks (stress concentrators), the starting points of crack propagation. The second cause is unprofessionally performed welding which later in service causes fracture at the weld. The third cause is the too high content of carbon in the material of the railway vehicle wheel rim. During braking, the higher content of carbon caused formation of excessively hard (and brittle) martensite in the surface layer of the rim.

traffic accident; fracture; vehicle

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