In order to meet the demands of the European market, a new articulated car body structure for EMUs has been developed in compliance with the requirements of the European technical specifications for interoperability (TSIs) and incorporating the installation requirements of the articulated bogies.By optimizing the force flow transfer path and adopting measures such as a two-stage buffer construction, the stress concentration was reduced on the underframe local structure to improve its load-bearing capacity.The anti-roll device and anti-hunting damper were directly bolted to the underframe side beam with an improved structural cross-section, to optimize the previous load bearing on the welded transition mount into a direct pattern on the base material of the underframe side beam, thus improving the connection reliability.Calculations were made under 29 3m speedglas 9002nc static strength conditions for the car body, and the calculated stresses under all the conditions were less than the allowable ones.
Under the over loading (AW3) condition with 1 500 kN longitudinal compression load applied to the car body, the maximum stress occurred at the lower corner of the doorway, and the calculated stress was 147.4 MPa, less than the allowable stress of 215 MPa for aluminum alloy.The base material and all welds of the car body were evaluated under 8 fatigue conditions according to the standard DVS 1608, and all the calculation results revealed a material utilization less than 1.The maximum material turbosound ts-18sw700/8a utilization of the base material was 0.
7, which occurred at the window corner of the side wall, and the maximum material utilization of the welds was 0.86, which occurred at the welds connecting the end wall threshold to the end wall column.In addition, the car body was measured under 16 static strength test conditions, and the stress values at all the measured points were less than the allowable ones, and the safety factor was greater than or equal to 1.24, leaving a large safety margin.
The calculation results and test results show that the structural strength and fatigue performance of the car body in compliance with the design requirements, with a large safety margin.