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 应用科技  2020, Vol. 47 Issue (4): 106-110  DOI: 10.11991/yykj.201907015 0

### 引用本文

YAN Zichao, MENG Fanliang, ZHOU Minghao, et al. Study on the transient simulation method for door slam fatigue[J]. Applied Science and Technology, 2020, 47(4): 106-110. DOI: 10.11991/yykj.201907015.

### 文章历史

Study on the transient simulation method for door slam fatigue
YAN Zichao, MENG Fanliang, ZHOU Minghao, YU Qingchao
Chery Automobile Co., Ltd., Wuhu 241009, China
Abstract: A finite element method based on transient response was established to evaluate slam durability of the automobile door. According to the Abaqus/Explicit direct integration method, the door was dynamically simulated using direct integration method, and the time history of the door’s closing stress and strain was obtained. Based on the Ncode welding spot S-N and sheet metal E-N curves, and the Miner linear cumulative theory, the fatigue result and the risk position of the door was predicted through multiple cycles’ tests. The simulation accuracy of the door closing process was improved by carrying out the correlation analysis of test acceleration. Compared with slam fatigue test results, the rationality of this method was verified. And further, the door was optimized and improved, and finally passed through the test.
Keywords: automobile side door    durability    simulation method    acceleration    transient response    slam fatigue    correlation    Abaqus    Ncode

1 汽车侧门开关疲劳分析方法

2 有限元模型

Abaqus/Explicit采用中心差分法对时间进行积分，求解显式运动方程，因为不需要求解线性方程组，所以每个增量步的费用较低，特别适用于求解需要分成许多小的时间增量来达到高精度的动力学仿真，如冲击、碰撞等[15-17]。在Abaqus中，求解应力或位移的单元类型很多，本文中选用的是线性减缩积分单元提高分析效率。但是线性减缩积分单元由于存在“沙漏”问题，采用线性减缩积分单元模拟承受弯曲载荷的结构时，沿厚度方向上至少应划分4个单元[18]

 $f = \frac{F}{l} \frac{L}{N}$

3 模型对标

4 疲劳验证