关键词: 轻卡驾驶室；前保险杠；疲劳性能；有限元分析

Abstract: In this paper, the fatigue performance of the front bumper of a light truck cab is studied by finite element analysis and test. Firstly, the finite element model of the front bumper is established, the strength calculation results are compared with the bench stress test results, and the finite element model is calibrated, which are the foundation for fatigue performance analysis. Secondly, the fatigue simulation analysis and fatigue test are carried out. The results are basically consistent, and both point to the existence of stress concentration in the original structure, and the fatigue performance cannot been meet the design and operating requirements. Finally, the original front bumper structure is optimized to remove the stress concentration area, and the fatigue performance of the optimized structure is simulated. Compared with the original scheme, the fatigue performance of the optimized scheme is greatly improved, and the final optimization scheme successfully passed the bench test and reliability road test, and is put into use. The combination of simulation and experiment provides a very effective means to study the fatigue performance of the front bumper of light trucks.

Key words: Light truck cab; Front bumper; Fatigue performance; Finite elements analysis