Abstract
In order to predict the fatigue life of frame, a new bench test method of the frame torsion fatigue is proposed, which can approximately reflect the results of enhanced road test. The frame finite element model was established and the simulation was carried out to determine the dangerous position of fatigue life failure. The load spectrum of the fatigue dangerous position was collected, and the fatigue damage value was analyzed by the rain-flow counting method and Miner criterion. The equivalent conversion relationship of the fatigue life between bench test and road test was established. The mean error between theoretical calculation result and bench test result is 5.2 %; The mean error between theoretical calculation result and road test result is 3.85 %. The results showed that the bench test method of frame torsion fatigue can improve the precision and reliability of the frame fatigue life prediction.
Highlights
The frame is the base body of the vehicle, and the fatigue life is an important index of the frame design
In order to verify whether the frame meets the fatigue life requirements, it is necessary to perform bench fatigue test and enhanced road fatigue test
The frame bench test can eliminate the influence of climate environment, human interference, vehicle conditions and other factors, and the bench test has strong controllability and good consistency of test data, but the reasonableness of the fatigue bench test method will directly affect the prediction results of the frame fatigue life
Summary
The frame is the base body of the vehicle, and the fatigue life is an important index of the frame design. It is necessary to carry out research on the bench test method of the frame fatigue. The loading methods of the frame bench fatigue test is mainly included equal-amplitude cyclic load and road simulation load. The fatigue test method and fatigue life prediction of the frame under constant amplitude loading were introduced in reference [2]. The prediction methods of frame fatigue life include numerical analysis method, bench test method and road method. In reference [4], the fatigue analysis method based on the combination of simulation, bench test and road test were introduced, and the excitation of bench test was road random load spectrum. RESEARCH ON BENCH FATIGUE TEST METHOD OF FRAME UNDER TORSION CONDITION. The article focuses on the analysis of the bench test method of the frame torsional fatigue. The bench test method of the frame torsional fatigue was developed, and the equivalent conversion relationship between bench fatigue life and road fatigue life was established
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