Fundamental study on the macro residual stress of the railway bogie frames

Abstract

Bogie frames for railway vehicles are generally produced by assembling some components that are formed by pressed steel plates. Bogie frames are required to have sufficient strength due to their importance, and one of the contents to be considered for strength is the residual stress. Although there have had some investigations into residual stress on the sight of welds, there have been no investigations into the macro residual stress of bogie frames. In addition to that, the extent of the macro residual stress of bogie frames has not been reported. In this study, we conducted macro residual stress measurements of the bogie frame by sectioning method. The measurement results showed that the compressive macro residual stresses from 40 to 140 MPa were measured on the bottom plate of the side beam.