汽车工程 ›› 2021, Vol. 43 ›› Issue (10): 1555-1564.doi: 10.19562/j.chinasae.qcgc.2021.10.019

• • 上一篇    

基于应力张量分析的后副车架疲劳试验

程稳正(),余小巧,肖厦,董远明,侯杰   

  1. 吉利汽车研究院(宁波)有限公司,宁波 315000
  • 收稿日期:2021-04-07 修回日期:2021-05-20 出版日期:2021-10-25 发布日期:2021-10-25
  • 通讯作者: 程稳正 E-mail:wenzheng.cheng@geely.com

The Fatigue Test of Rear Sub⁃frame Based on Stress Tensor Analysis

Wenzheng Cheng(),Xiaoqiao Yu,Xia Xiao,Yuanming Dong,Jie Hou   

  1. Geely Automobile Research Institute (NINGBO) Co. ,Ltd. ,Ningbo 315000
  • Received:2021-04-07 Revised:2021-05-20 Online:2021-10-25 Published:2021-10-25
  • Contact: Wenzheng Cheng E-mail:wenzheng.cheng@geely.com

摘要:

针对装有五连杆后悬架的后副车架零部件级台架疲劳试验由于液压作动器相互干涉,难以布置而无法进行的问题,提出一种基于应力张量分析的疲劳试验方法。它根据危险点应力状态,识别出关键载荷通道,对于两个潜在风险点,分别定义了简单可实施的块谱载荷。设计的试验方案,危险点主应力方向基本不变,损伤与原始路谱接近,试验结论与后悬架系统试验一致,降低了试验成本和开发风险。

关键词: 后副车架, 应力张量, 疲劳, 块谱, 台架试验

Abstract:

In view of that the component level fatigue bench test of rear sub-frame for five links rear suspension can't be conducted due to the interference between hydraulic actuators and hard to arrange, a fatigue test method based on stress tensor analysis is proposed. According to the stress state of potential dangerous points, the key load channels are identified, and the simple and implementable block spectra loads are defined respectively for two potential dangerous points. In the test scheme devised, the principal stress directions of dangerous points remain basically unchanged, their damage is close to that with original road spectra, and the conclusion of the test is consistent with that of suspension system test, with the cost of test and development risk reduced.

Key words: rear sub?frame, stress tensor, fatigue, block spectrum, bench test