Fatigue Life Analysis Of Structure Of C80B Gondola Car Body

In the implementation of the high speed and heavy load policy in our railway freighttransportation, the80t coal gondola car running on Daqin line is an important achievement ofour current trucks and equipment technology. The gondola’s fatigue life analysis is animportant part of the design process of the gondola car as well as the main evaluation standardfor the new product. In the thesis, the gondola car body structure fatigue life is predicted notonly based on the United States AAR standard, but also predicted by the dynamic simulationand finite element analysis of the hybrid method.First of all, the Gondola car body finite element model is set up. According to the"railway vehicle strength design and test appraisal regulations", the Gondola car body modelis made strength check under various operating conditions, and the results show that the bodystructure meets demand of our country standard. In the basis of the AAR standard, thegondola car body model analysis is performed under four load conditions to get the stress ofthe dangerous parts of the gondola car body.Secondly, the thesis converts the American AAR standard90t hopper wagon loadspectrum into the stress spectrum of our80t of new coal gondola car. Then according to thenominal stress method, the thesis calculates the gondola car’s fatigue damage and thecumulative damage of its dangerous part under four conditions (heart disc load, longitudinalload, torsion load and roll load).Thirdly, the gondola car multibody dynamics model is built in SIMPACK softwarebased on multi-body dynamics theory. In addition, this thesis introduces the body flexibleprocess in detail. Then the thesis analyses the quality of operation of the gondola cardynamics model in the typical working conditions，taking the five track spectrum of theUnited States as excitation.Fourthly, through the simulation of the gondola rigid-flexible coupling dynamics modelin line sample, the thesis gets load history of the body structure, and then the stress influencecoefficient is obtained by the finite element analysis software ANSYS. According to thequasi-static analysis, the stress time histories of the body structure are acquired in Fatigueanalysis software MSC.Fatigue. With the S-N curve of the body structure material, the thesis gets the body structure of the whole life nephogram.According to the analysis of body fatigue life by the two paths AAR standard and virtualsimulation，the results of fatigue weak position in body structure are identical and thedifference of shortest fatigue life is35%.