Study on fatigue characteristics of crossbeam in torsion-beam rear suspension under torsional condition
The fatigue characteristic of crossbeam in torsion-beam rear suspension under torsional condition was analyzed based on finite element simulation,and a new method for predicting the fatigue life of complex structural parts by equivalent specimens was pro-posed.The simulation model of torsion-beam rear suspension was established,and the stress distribution laws of crossbeam were ana-lyzed.Based on static analysis results,combined with the fatigue life curves of FB590 high-strength steel,the surface roughness and surface residual stress of the formed crossbeam,the fatigue life of crossbeam was calculated according to the nominal stress method and the Gerber average stress correction.According to the bending deformation degree in the danger area,the equivalent specimens(AR,R20 and R10)with different bending radius were designed for fatigue tests and fatigue fracture analysis,which realize the effective pre-diction of the test results of cross-beam fatigue bench.The results show that the fatigue danger area and stress concentration area of crossbeam are located at the corner of the transition section under torsion condition.The amplitude-life curves of crossbeam effectively cover all load conditions under service conditions,and the reference range of stress amplitude of actual load spectrum is obtained.The intersection life between equivalent specimens R10 and AR,R10 and R20 is within the actual fracture life area of crossbeam in the bench test,which indicates that the designed fatigue test of equivalent specimen can effectively characterize the fatigue performance of crossbeam in the dangerous area.
torsion-beam rear suspensionequivalent specimenfatigue characteristicfatigue life prediction
万方数据
维普
