Stress intensity factor calculation on critical points of railway bogie frame

초록

A stress intensity factor, SIF calculation method on a cracked railway bogie frame incorporating sub-modeling method was presented. For this purpose, a 3D FE model of railway bogie frame was built and performed structure analyses following UIC code. The locations of high stressed points were compared with the physical crack locations which were found at the railway bogies frame which had over 20 years of commercial line operation history. Base on the structure analyses results, we created a three dimensional crack on the railway bogie frame and applied two analysis methods to calculate the SIF. First, we created a sub-model and calculated the SIF by using the displacement field calculated from structure analysis. Second, we created a full FE model which was meshed from the geometry model of bogie frame and calculated the SIF directly. The proposed sub-modeling method to calculate the SIF was verified by comparing the analysis results. The analysis results showed a reasonable correlation.