Fatigue Analysis of Automobile Steering Knuckle Considering the Effect of Low Load Strengthening

被引：0
|
作者：
Dong G. [1 ]
Du F. [1 ]
Wang W. [1 ]
Lang Y. [2 ]
机构：
[1] Yanshan University, Hebei Key Laboratory of Special Delivery Equipment, Qinhuangdao
[2] Engineering Simulation Center of CITIC Dicastal Co., Ltd., Qinhuangdao
来源：
Dong, Guojiang (dgj@ysu.edu.cn) | 1600年 / SAE-China卷 / 42期
关键词：
Fatigue damage; Load spectrum; Miner rule; Small load strengthening; Steering knuckle;
D O I：
10.19562/j.chinasae.qcgc.2020.03.019
中图分类号：
学科分类号：
摘要：
Based on real vehicle test on the proving ground, combining with the finite element dynamic simulation and fatigue durability simulation of components, the difference of fatigue life prediction of automobile components with the consideration of small load strengthening effect and Miner criterion is explored in the paper. Fatigue damage risk point of the front knuckle (the road test strain monitoring point) is determined by joint analysis of indoor vehicle vibration test and finite element simulation; the strain time history of strain monitoring points of strengthened road on the proving ground is acquired, after pretreatment, time domain acceleration, extrapolation of rain flow matrix and load spectrum classification, ten-grade equivalent stress spectrum is obtained. Combining with the low load strengthening theory and the linear cumulative damage theory, the fatigue effect and damage effect of the ten-grade equivalent stress spectrum are analyzed, in contrast to the traditional Miner criteria, considering the strengthening effect of small load on the increase of the fatigue limit of the component in the process of loading, the component S-N (simplified) curve needs to be modified, offset upward from the initial S-N curve. The predicted fatigue life of the knuckle based on the modified S-N curve and linear fatigue damage accumulation theory is 40.6% higher than that of the Miner criterion. Taking into account of the effect of material strengthening behavior, this method makes up for the defect of the Miner theory which does not take into account of the interaction between different loads and the effect of material hardening transient behavior to a certain extent, and provides a new reference for fatigue life estimation and lightweight design of real components. © 2020, Society of Automotive Engineers of China. All right reserved.
引用
收藏
页码：406 / 415
页数：9
相关论文
共 8 条
  • [1] You S.S., Fricke D., Advances of virtual testing and hybrid simulation in automotive performance and durability evaluation, SAE International Journal of Materials and Manufacturing, 4, 1, pp. 98-110, (2011)
  • [2] Zhao L.H., Li J.X., Yu W.Y., Et al., Experimental study on the coaxing effect of multi-level stresses with different sequences, Strength of Materials, 49, 5, pp. 1-6, (2017)
  • [3] Lu X., Zheng S.L., Strengthening and damaging under low-amplitude loads below the fatigue limit, International Journal of Fatigue, 31, 2, pp. 341-345, (2009)
  • [4] Nicholas T., Step loading for very high cycle fatigue, Fatigue & Fracture of Engineering Materials & Structures, 25, 8-9, pp. 861-869, (2010)
  • [5] Makajima M., Jung J.W., Uematsu Y., Et al., Coaxing effect in stainless steels and high-strength steels, Key Engineering Materials, 345-346, pp. 235-238, (2007)
  • [6] Yu J., Zheng S., Feng J., Et al., New methodology for determination of load spectra for the vehicle accelerated durability testing associated with the time correlated fatigue damage analysis method, International Journal of Automotive Technology, 18, 3, pp. 547-560, (2017)
  • [7] Shao Y., Liu J., Mechefske C.K., Drive axle housing failure analysis of a mining dump truck based on the load spectrum, Engineering Failure Analysis, 18, 3, pp. 1049-1057, (2011)
  • [8] Yan J.H., Zheng S.L., Zhao K., Experimental investigation on the small-load-omitting criterion, International Journal of Fatigue, 23, 5, pp. 403-415, (2001)
1