基于应力场强法的随机载荷作用下转向节疲劳寿命预估

中国机械工程 ›› 2011, Vol. 22 ›› Issue (13): 1629-1633.

基于应力场强法的随机载荷作用下转向节疲劳寿命预估

黄海波;陈星欣;翁胜峰

宁波大学,宁波,315211

出版日期:2011-07-10 发布日期:2011-07-14
基金资助:
宁波市自然科学基金资助项目(2008A610039)
Natural Science Foundation of Ningbo（No. 2008A610039）

Knuckle Fatigue Prediction Based on Stress Field Intensity Approach under Random Excitation

Huang Haibo;Chen Xingxin;Weng Shengfeng

Ningbo University,Ningbo,Zhejiang,315211

Online:2011-07-10 Published:2011-07-14
Supported by:
Natural Science Foundation of Ningbo（No. 2008A610039）

摘要/Abstract

摘要：

利用多体动力学理论建立了双横臂悬架系统的刚柔耦合动力学模型,采用国家B级路面谱进行模拟激励,得到了汽车转向节的六分力时间历程。结合转向节有限元模型,获得了转向节实时等效单元应力,通过统计确定了最易疲劳的损伤区域。运用应力场强理论来计算应力场强,并使用雨流计数法进行了统计,综合计算了转向节的疲劳寿命。结果显示,连接车轮横臂处最易发生疲劳破坏,特定条件下的疲劳循环寿命为2.4×107次。

关键词:

转向节, 应力场强法, 随机激励, 损伤区域, 疲劳寿命

Abstract:

The fatigue life of a steering knuckle was predicted using finite element method, multi-body dynamics and stress field intensity approach. Six-component forces of all steering knuckle joints were obtained in time history by multi-body suspension system dynamic simulation. Then the most easily fatigue damage region was confirmed. The stress fields were then calculated at each step and the numbers of each stress field value were counted by rain flow method. The fatigue life was then calculated by stress field intensity approach. The results show that the connected region between wishbone and rib is the most easily damaged region and the fatigue life is 2.4×107 time.

Key words: steering knuckle, stress field intensity approach, random excitation;damage region, fatigue life

中图分类号:

黄海波, 陈星欣, 翁胜峰.

基于应力场强法的随机载荷作用下转向节疲劳寿命预估

[J]. 中国机械工程, 2011, 22(13): 1629-1633.

HUANG Hai-Bei, CHEN Xing-Xin, WENG Qing-Feng.

Knuckle Fatigue Prediction Based on Stress Field Intensity Approach under Random Excitation

[J]. China Mechanical Engineering, 2011, 22(13): 1629-1633.

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