Analysis Of Load Spectrum And Dynamic Stress Response Of C80Car Body Based On Railway Line Test

Speed increase and heavy haul have been the direction of development of China railway freight transport. At the same time, the successful development of C80, a kind of gondola car for heavy haul railway transportation of coal, promotes the development of China railway freight transport at top speed. Shenhua Group is the biggest production and transportation enterprise of coal energy in China and many C80s of Shenhua Group are running on railways. However, the operation condition of specialized railway line is complex and poor. The rhegma rate of C80car body that caused by random alternating load in operation is obviously higher than other gondola car. Therefore, it is of vital importance to research on the load spectrum of C80car body and master the load condition of car body. In addition, to find the typical railway line characteristics and operation conditions that can affect the structural fatigue damage of C80car body seriously provides theoretical guidance for fatigue reliability evaluation of vehicle components and maintenance period of the running components. Based on the load spectrum test of C80, this paper mainly discuss the following several aspects:(1) By installing the dynamometer Coupler and the dynamometer Bolster on the C80gondola to get coupler, center plate and side bearing load data. Then, based on the actual measured load-time history data that tested on Shenshuo-Shuohuang railway line and rain-flow counting method, this paper established the vertical, longitudinal, sidewinder and torsion load spectrum of loaded car body running on Shenmu-Huanghua railway line.(2) On one hand, this paper established finite element model of C80car body, carried out static analysis and calculated the stress of four kinds of operation conditions, that is vertical, longitudinal, sidewinder and torsion. As a result, load-stress transfer coefficients of the key fatigue points were determined under each load systems. At the same time, carried out modal analysis on car body model, and body measurement point spectrum analysis comparison, excluding the impact of the dynamic factors, clarified the static load-stress transfer relations can be completely used for subsequent damage assessment of car body fatigue.(3) During the test of load, the dynamic stress of key fatigue points was also tested. Based on this work, this paper calculated the damage of measured stress spectrum and load spectrum and contrasted the result by using damage consistency criterion, to calibrate the load spectrum. On the other hand, in consideration of lack of fatigue strength, such as the area of NO.1end wall auxiliary beam, by using improved load spectrum, this paper analyzed the damage and life of the improved structure and confirmed the reliability of the improved structure.