[1]高祥林,王建明,汪言,等.升降平台运动构件焊缝疲劳寿命数值仿真[J].郑州大学学报(工学版),2020,41(02):35-40.
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升降平台运动构件焊缝疲劳寿命数值仿真()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
41
期数:
2020年02期
页码:
35-40
栏目:
出版日期:
2020-05-31

文章信息/Info

Title:
Numerical Simulation of Weld Fatigue Life of Moving Components of Lifting Platform
作者:
高祥林王建明汪言李博志
文献标志码:
A
摘要:
针对剪叉式升降平台运动构件焊缝疲劳寿命预测,提出了一种基于 BS7608 标准的大范围运动 构件焊缝疲劳寿命仿真方法。 该方法首先通过升降平台整机多体动力学仿真分析获得运动构件铰链处 的时变载荷,并将该载荷通过坐标变换映射到待分析构件的连体随动坐标系中,随后在待分析构件的连 体随动坐标系中建立该构件包括焊缝的疲劳寿命预测有限元模型,其建模过程涉及合理选择铰链、定义 静定位移约束、部分铰链施加连体随动坐标系下的铰链时变载荷等核心建模问题。 依据 BS 标准提供的 S-N 曲线预测构件母材和焊缝的疲劳寿命分布,通过整机疲劳试验结果验证该方法的正确性和有效性, 为包含大范围刚体运动的构件焊缝疲劳寿命预测提供一种有效的数值分析方法。
Abstract:
Aiming at the prediction of weld fatigue life of moving components of scissors lifting platform, asimulation method of weld fatigue life of moving components based on BS7608 standard was proposed. Firstly ,the time-varying load at the hinge of the moving component is obtained by multi-body dynamics simulation a-nalysis. And the load was mapped to the local coordinate system of the component to be analyzed by coordinatetransformation. Then, the FEM model of the fatigue life prediction was established in the local coordinate sys-tem of the component to be analyzed. The modeling process involved the key problems such as reasonable se-lection of hinges to define the static constraints of displacement, and the application of time-varying loads onthe hinges in the local coordinate system. According to the S-N curve provided by BS standard, the fatigue lifedistribution of base metal and weld was predicted. The correctness and validity of this method were verified bythe fatigue test results. It shed new lights on the fatigue life prediction of weld of components with wide range ofrigid body motion.
更新日期/Last Update: 2020-05-30