考虑低载荷强化效应的汽车转向节疲劳分析*

doi:10.19562/j.chinasae.qcgc.2020.03.019

汽车工程 ›› 2020, Vol. 42 ›› Issue (3): 406-415.doi: 10.19562/j.chinasae.qcgc.2020.03.019

• • 上一篇

考虑低载荷强化效应的汽车转向节疲劳分析^*

董国疆¹, 杜飞¹, 王威¹, 郎玉玲²

1.燕山大学,河北省特种运载装备重点实验室,秦皇岛 066004;
2.中信戴卡股份有限公司工程仿真中心,秦皇岛 066004

收稿日期:2019-03-13 出版日期:2020-03-25 发布日期:2020-04-16
通讯作者: 董国疆,教授,博士,E-mail:dgj@ysu.edu.cn
基金资助:
*国家自然科学基金(51775481)、河北省自然科学基金(E2019203418)和河北省教育厅高等学校科技计划重点项目(ZD2017078)资助。

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

Dong Guojiang¹, Du Fei¹, Wang Wei¹, Lang Yuling²

1.Yanshan University, Hebei Key Laboratory of Special Delivery Equipment, Qinhuangdao 066004;
2.Engineering Simulation Center of CITIC Dicastal Co., Ltd., Qinhuangdao 066004

Received:2019-03-13 Online:2020-03-25 Published:2020-04-16

摘要/Abstract

摘要： 本文中基于试验场强化道路实车测试,结合零部件有限元动力学仿真和疲劳耐久性能仿真,探求考虑小载荷强化效应与Miner准则两种疲劳分析方法对汽车零部件疲劳寿命预测的差异性。通过室内实车振动测试与有限元仿真联合分析,确定前转向节疲劳损伤危险点(即路试应变监测点);提取试验场强化道路实测应变监测点应变时间历程,经过预处理、时域加速、雨流矩阵外推和载荷谱分级得到10级等效应力谱。结合低载荷强化理论和线性累积损伤理论对10级等效应力谱的疲劳效应和损伤效应进行分析,相对于传统Miner准则而言,考虑了小载荷强化效应使构件在加载过程中疲劳极限呈现上升规律,进而需要修正构件S-N曲线(简化),较初始S-N曲线向上偏移,基于修正后构件S-N曲线并应用线性疲劳损伤累积理论预估的转向节疲劳寿命较Miner准则提高了40.6%。此种方法考虑了材料强化行为的影响,一定程度上弥补了Miner理论未考虑各级载荷间相互影响和材料硬化瞬态行为影响的缺陷,对实际零部件疲劳寿命估计与轻量化设计提供新的参考。

关键词: 疲劳损伤, 低载荷强化, Miner准则, 转向节, 载荷谱

Abstract: 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

Key words: fatigue damage, small load strengthening, Miner rule, steering knuckle, load spectrum

董国疆, 杜飞, 王威, 郎玉玲. 考虑低载荷强化效应的汽车转向节疲劳分析^*[J]. 汽车工程, 2020, 42(3): 406-415.

Dong Guojiang, Du Fei, Wang Wei, Lang Yuling. Fatigue Analysis of Automobile Steering Knuckle Considering the Effect of Low Load Strengthening[J]. Automotive Engineering, 2020, 42(3): 406-415.

参考文献

[1] YOU S S, FRICKE D. Advances of virtual testing and hybrid simulation in automotive performance and durability evaluation[J]. SAE International Journal of Materials and Manufacturing,2011,4(1):98-110.
[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[J]. Strength of Materials,2017,49(5):1-6.
[3] LU X, ZHENG S L. Strengthening and damaging under low-amplitude loads below the fatigue limit[J]. International Journal of Fatigue,2009,31(2):341-345.
[4] 郑松林,李冰莲,冯金芝.基于低载强化的悬架弹簧耐久性评价[J].机械强度,2013(1):77-82.
[5] NICHOLAS T. Step loading for very high cycle fatigue[J]. Fatigue & Fracture of Engineering Materials & Structures,2010,25(8-9):861-869.
[6] MAKAJIMA M, Jung J W, UEMATSU Y, et al.Coaxing effect in stainless steels and high-strength steels[J]. Key Engineering Materials,2007,345-346:235-238.
[7] 卢曦,郑松林,寇宏滨.圆柱齿轮低载强化试验研究[J].中国机械工程,2005,16(23):2109-2112.
[8] 储军,郑松林,冯金芝.基于低幅锻炼载荷的累积强化效果模型[J].机械工程学报,2011,47(16):30-34.
[9] 梁凌宇.结构钢的变幅疲劳加载应力幅间交互作用研究[D].成都:西南交通大学,2015.
[10] 刘俊,刘亚军,张少辉.基于虚拟迭代技术的中型货车驾驶室载荷谱的求取[J].中国公路学报,2018,31(9):220-228.
[11] 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[J]. International Journal of Automotive Technology,2017,18(3):547-560.
[12] SHAO Y, LIU J, MECHEFSKE C K. Drive axle housing failure analysis of a mining dump truck based on the load spectrum[J]. Engineering Failure Analysis,2011,18(3):1049-1057.
[13] YAN J H, ZHENG S L, ZHAO K. Experimental investigation on the small-load-omitting criterion[J]. International Journal of Fatigue,2001,23(5):403-415.
[14] 郑国峰,上官文斌,韩鹏飞.基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法研究[J].机械工程学报,2018,54(10):156-166.
[15] 刘海鸥,张文胜,徐宜,等.基于核密度估计的履带车辆传动轴载荷谱编制[J].兵工学报,2017,38(9):1830-1838.
[16] 郑松林,蒋燕娜,冯金芝.基于强度变化特性的随机谱载荷下疲劳寿命预估模型[J].汽车工程,2013,35(1):82-87.
[17] 赵晓鹏,张强,姜丁,等.某型越野车试验场载荷谱的压缩与外推[J].汽车工程,2009,31(9):871-875.
[18] 高云凯,徐成民,方剑光.车身台架疲劳试验程序载荷谱研究[J].机械工程学报,2014,50(4):92-98.
[19] 沈永峰,郑松林,王治瑞.某型轿车摆臂程序载荷谱编制研究[J].中国机械工程,2013,24(14):1974-1978.
[20] 李文礼,石晓辉,柯坚,等.关联用户的汽车传动系载荷谱室内台架试验编制方法[J].机械工程学报,2014,50(20):143-150.
[21] 陈景杰,黄一,李玉刚.考虑疲劳载荷相互影响的修正的Miner准则研究[J].中国造船,2014(3):36-42.

考虑低载荷强化效应的汽车转向节疲劳分析^*

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

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