Analysis On Fatigue Of Commercial Vehicle Driving Axle Based On Virtual Proving Ground

Along with the increasingly fierce market competition, nowadays, many big carcompanies have paid more attention to fatigue life problem of products, thoughthrough the real car road test is the most direct and accurate way, but the process oftest is long and expensive. Driving axle shell which are in use often appear fatigueproblems like craze, fault, the virtual proving ground technology is used in the designsegement to realize target parts of fatigue life prediction, which can reduce the risk ofdesign and shorten the development cycle, has a high value of application.The vehicle durability test model of virtual is completed by fully consider thevarious nonlinear factors in vehicle system in the paper. By according to HaiNandurability road test specification, this study confirmed the type of the durabilitystrengthen road which is required.Based on the virtual durability test environment, thetransient response analysis was carried out to abtain the dynamic stress time history ofthe vehicle structure. With the rain-flow counting method and strain fatigue theory，calculated the integrated fatigue life of the rear suspension of a commercialvehicle.The load spectrum of three coordinate direction was extracted through theexplicit integral operator.This paper made driving axle housing as an example, drived by the road surfaceload spectrum which is get from virtual road test, the unit load stress and strain iscalculated by using ABAQUS, and the standard static method is carried out to solvethe dynamic stress response of the drive axle, the fatigue life of the drive axle housingis performed by using the total life and stress-life method. By contrasting the test dataand the simulation results, fatigue life analysis based on virtual proving groundtechnology is proved be feasible and valuable, the reasons of fatigue weak locationsdestruction is discussed, and the improvement measures is put forward.