| Through analyzing fractures of the motorcycle carriage, most of those fractures are related to fatigue failure of the motorcycle carriage system. Therefore, the analysis of fatigue resistance of the motorcycle carriage and the life evaluation will not only contribute to evaluate the rest life of the motorcycle carriage, but also to the further development of new motorcycle carriages, which are important both theoretically and practically.On the basis of the current research on test machines for the motorcycle carriage system both at home and abroad, a new fatigue test machine is proposed in the form of a loaded program. Fatigue resistance theories and practical methods are analyzed to obtain analytic modeling for corresponding test machines, by which the test specification could be established. From studies mentioned above, it can be concluded that the fatigue of the motorcycle carriage is characterized by the mechanical high cycle and the variable amplitude. In this paper, the fatigue of the motorcycle carriage system is analyzed in accordance with the safety life and the specific calculation is introduced. Specifically, 3-D solid modelling of a concrete motorcycle carriage is established and then its virtual assembly is fulfilled, using Pro/ENGINEER software. Moreover, its FE modelling for analysis are built in different working conditions by HyperMesh software. Eventually, Fatigue resistance of the motorcycle carriage is calculated by the resolver of Nastran, based on which its fatigue life is forecasted by MSC.FATIGUE software.To verify the theoretical modelling and the analysis, fatigue resistance of a concrete motorcycle carriage and its fatigue life has been tested by using this fatigue test machine. And the experimental result basically accords with the theoretical result, which provides the theoretical basis for the further research on the analysis of fatigue life of the motorcycle carriage system and its life evaluation in practical work conditions.
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