基于复杂边界的牵引车车架疲劳研究

doi:10.19562/j.chinasae.qcgc.2023.05.017

Abstract

Abstract:

In order to enhance the accuracy of frame fatigue life calculation and accurately predict the frame life in the design stage, it is necessary to consider the influence and coupling effect of the dynamic load on the fatigue of the frame at the outer connection point of the main structure. In this paper, a research method of frame fatigue based on complex boundary is proposed. The whole vehicle load spectrum is collected in the test field to obtain the whole cycle damage value. Based on the damage equivalent principle, the damage value of various surface road combinations is obtained, which is equivalent to the target value of the full cycle, with an accuracy of 99.5%. A finite element frame model with outer points of the main structure is constructed and the unit stress field of the complex boundary is output. The high-precision vehicle dynamics model with saddle and trailer system is established based on the test field load spectrum and the bench test data, to obtain the dynamic load of the outer connection point. The fatigue of the frame is calculated by the fatigue damage theory, with the fatigue analysis results verified by field tests. The results show that the frame model with the complex boundary has high simulation accuracy. Through local optimization and model reconstruction, the frame life can meet the requirements.

Key words: complex boundary, dynamic load, damage equivalence, virtual iteration, life optimization

Zongyang Zhang,Shuangshuang Xie,Kai Wang,Yupeng Zhang,Tao Bing,Shitao Sun. Fatigue Study of Tractor Frame Based on Complex Boundary[J].Automotive Engineering, 2023, 45(5): 873-879.

Figures/Tables 20

References 20

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试验工况	特征路面	循环次数
满载工况	坑洼路A	13 031
	振动路B	3 509
	扭转路	3 022
	振动路A	1 277
	制动路	1 279
半载工况	坑洼路A	3 843
	振动路B	2 190
	振动路A	671

名称	测试值/kg	仿真值/kg	误差/%
前桥轴荷	6 511	6 727	3.3
中桥轴荷	8 245	8 500	3.1
后桥轴荷	8 030	8 317	3.6

Fatigue Study of Tractor Frame Based on Complex Boundary

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