CHAPTER 6
RESULTS AND DISCUSSION
Bogie Frame of Train is made in a welded steel box format to lighter its weight. Two side beams and two cross beams compose a bogie frame. These two beams are assembled and welded together by upper and lower cover plates. These upper and lower plates are typically 10mm to 15mm thick. The analysis has been carried out for different load cases and combination of these load cases. The analysis is carried out for total 9 load cases. The results are represented as follows.
6.1 RESULTS FOR LOAD CASE 1: Figure 6.1: Displacement plot for load case 1.
Figure 6.1 shows the resultant displacement plot of the Bogie Frame for load case 1. The maximum displacement of the Bogie Frame found to be was 4.205 mm at the node…show more content… From the table max displacement obtained is 5.313mm from all load cases. In case of Von-Mises Stress Maximum value obtained is 59.85MPa. Allowable stresses as per ASTM for SMA490B Steel is 245 MPa. All obtained values are within the specified limit of the Bogie Frame Material. Modified Goodman Diagram is constructed from the result obtained from all 9 load cases. Goodman Diagram is useful because it contains all the stress components. Here Mean Stress is plotted along abscissa and Stress amplitude is plotted along ordinate. The Stresses obtained from each load case is plotted on Goodman Diagram and the obtained Fatigue Stress is within the allowable stress of Frame material.
Figure 6.37: Goodman Diagram for Top Plate (Z1).
Figure 6.38: Goodman Diagram for Bottom Plate