[1]温珈毅,王悦东.基于等效结构应力法的镁合金接头疲劳寿命预测[J].机械与电子,2022,(07):27-31.
　WEN Jiayi,WANG Yuedong.Fatigue Life Prediction of Magnesium Alloy Joints Based on Equivalent Structural Stress Method[J].Machinery & Electronics,2022,(07):27-31.
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基于等效结构应力法的镁合金接头疲劳寿命预测()
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《机械与电子》[ISSN:1001-2257/CN:52-1052/TH]

卷:
期数:
2022年07期
页码:
27-31
栏目:
机电一体化技术
出版日期:
2022-07-28

文章信息/Info

Title:
Fatigue Life Prediction of Magnesium Alloy Joints Based on Equivalent Structural Stress Method
文章编号:
1001-2257 ( 2022 ) 07-0027-05
作者:
温珈毅; 王悦东
大连交通大学机车车辆工程学院,辽宁 大连 116028
Author(s):
WEN Jiayi ;  WANG Yuedong
( School of Locomotive and Rolling Stock Engineering , Dalian Jiaotong University , Dalian 116028 , China )
关键词:
镁合金; 等效结构应力; 曲线拟合; 疲劳寿命预测
Keywords:
magnesium alloy ;  equivalent structural stress ;  curve fitting ;  fatigue life prediction
分类号:
TG405
文献标志码:
A
摘要:
针对镁合金焊接结构疲劳强度评估方法不全面的问题,在等效结构应力法的研究基础上,提出了镁合金焊接接头疲劳寿命预测方法。基于 200 余个包含不同特征的镁合金接头疲劳试验数据,采用有限元数值模拟,计算试件接头焊趾处的等效结构应力。结合 ASME 标准中对曲线拟合的规范,进行镁合金接头寿命曲线拟合,得出了预测疲劳寿命的常系数 C d 和 h 。将拟合结果与铝材的疲劳寿命曲线进行对比,结果表明,镁合金接头在 1×107?次循环下的疲劳强度约为 31.6 MPa ,同等条件下约为铝材疲劳强度的 82% 。该镁合金接头疲劳寿命预测方法可用于评估镁合金结构疲劳强度是否满足轨道车辆车体结构使用需求。
Abstract:
In view of the problem that the fatigue strength evaluation method of magnesium alloy welded structure is not comprehensive , based on the research of equivalent structural stress method , a fatigue life prediction method for magnesium alloy welded joints is proposed.Based on more than 200 fatigue test data of magnesium alloy joints with different characteristics , finite element numerical simulation is used to calculate the equivalent structural stress at the weld toe of the specimen joint.Combined with the curve fitting specification in the ASME standard , the life curve fitting of magnesium alloy joints was carried out , and the constant coefficients C-d and h for predicting fatigue life were obtained.Comparing the fitting results with the fatigue life curve of aluminum , the results show that the fatigue strength of magnesium alloy joints under 1×107?cycles is about 31.6 MPa , which is about 82% of the fatigue strength of aluminum under the same conditions.The obtained fatigue life prediction method of magnesium alloy joints can be used to evaluate whether the fatigue strength of magnesium alloy structures meets the requirements of rail vehicle body structures.

参考文献/References:

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相似文献/References:

[1]王 雪,王悦东.基于等效结构应力法的 T 型焊接接头剩余寿命分析[J].机械与电子,2021,(08):13.
　WANG Xue,WANG Yuedong.Analysis of Remaining Life of T-shaped Welded Joints Based on Equivalent Structural Stress Method[J].Machinery & Electronics,2021,(07):13.

备注/Memo

备注/Memo:
收稿日期: 2022-02-05
基金项目:国家高速列车技术创新中心项目( CXKY-02-01-03 ( 2020 ));大连市科技创新基金计划( 2019J11CY017 )
作者简介:温珈毅 ( 1997- ),男,辽宁大连人,硕士研究生,研究方向为车辆结构分析与现代设计方法;王悦东 ( 1977- ),男,黑龙江佳木斯人,博士,教授,研究方向为车辆结构分析与现代设计方法、数字化仿真分析与优化、结构疲劳虚拟仿真。
更新日期/Last Update: 2022-08-24