Static And Dynamic Strength Analysis And Test Research On Heavy-duty Truck Front Axle

Front axle is one of the important parts of automotive steering driven axle, its performance directly affect the security and reliability of the car. Therefore, front axle should have enough static strength and good dynamic performance. In this paper, combined with the development of a heavy-duty truck front axle, CAE finite element analysis was applied in axle for its mechanical properties. The bench test was used to verify the finite element method for the development of the front axle. The main contents are as follows.By using software CATIA, front axle geometry model was established. The pretreatment software HyperMesh was used to clear simplified geometric model. The finite element mesh model of the front axle was established. According to the automobile axle design formula for the front axle in three kinds of typical working conditions of load calculation, the front axle load under three kinds of typical working conditions was calculated. By using OptiStruct, statics analysis of front axle was established. The analysis results show that the three kinds of working conditions, front axle static strength failure will not occur, the most dangerous under emergency braking conditions, and then working condition of sideslip, vertical static load is the safest.By using RADIOSS software, the modal analysis has been made on the front axle. The front axle was extracted using lanczos method under free state in the first six order natural frequency and vibration mode. Front axle vibration mutation phenomenon does not occur, and the first six order natural frequency is greater than the road excitation frequency range 0 to 50 Hz, and the body's natural frequency and distance, will not cause the front axle resonance.Considering the factors influencing fatigue strength, the modified S-N curve of the front axle was established. According to the standard QC/T 513-1999, vertical bending fatigue test of the front axle was simulated by using ANSYS Workbench. The fatigue theory of finite element analysis shows that the lowest fatigue life of front axle is 985000 times, which meet the requirements of the standard QC/T 483-483.Finally, in order to validate the credibility of the finite element analysis results, according to the standard of automobile front axle bench test, the bench test for the design of front axle, shows that most of the points of the finite element stress calculation value and test close to measured values, the relative error in the range of permission. Vertical bending fatigue bench test results of the front axle agreed with the requirements of the standard QC/T 483-483. Therefore, the theoretical calculation results of the finite element method, which is used on axle, are reliable, and the conclusions are helpful.