空气弹簧气室载荷对焊接构架疲劳强度影响
Influence of Air Spring Chamber Pressure on Fatigue Strength of Welded Frame
- 机车电传动 2019年第5期 页码：40-45
- 作者机构：
1.西南交通大学 牵引动力国家重点实验室，四川 成都 610031
- 作者简介：
刘上源（1995—），男，硕士，研究方向为机车车辆结构及可靠性、随机振动疲劳。
- 基金信息：国家自然科学基金项目(51675446);国家自然科学基金联合基金项目(U1534209)
DOI：10.13890/j.issn.1000-128x.2019.05.009
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刘上源, 阳光武, 肖守讷, 等. 空气弹簧气室载荷对焊接构架疲劳强度影响[J]. 机车电传动, 2019,(5):40-45.
Shangyuan LIU, Guangwu YANG, Shoune XIAO, et al. Influence of Air Spring Chamber Pressure on Fatigue Strength of Welded Frame[J]. Electric Drive for Locomotives, 2019,(5):40-45.
刘上源, 阳光武, 肖守讷, 等. 空气弹簧气室载荷对焊接构架疲劳强度影响[J]. 机车电传动, 2019,(5):40-45. DOI： 10.13890/j.issn.1000-128x.2019.05.009.
Shangyuan LIU, Guangwu YANG, Shoune XIAO, et al. Influence of Air Spring Chamber Pressure on Fatigue Strength of Welded Frame[J]. Electric Drive for Locomotives, 2019,(5):40-45. DOI： 10.13890/j.issn.1000-128x.2019.05.009.
摘要
为保证轨道车辆结构安全性，针对二系悬挂采用空气弹簧的转向架焊接构架，基于JIS标准的疲劳评价方法和Goodman图法，根据EN 13749主要运营工况进行加载，从工程应用角度出发，以构架焊接成型后是否可从外部进行实时监测和检测为评判标准，将侧梁上盖板单边角焊缝分为梁内焊根和梁外焊趾，将侧梁双边角焊缝分为梁内角焊缝和梁外角焊缝分别进行疲劳校核，完成了焊接构架侧梁角焊缝全面的疲劳评估。以是否添加空气弹簧气室压力作为研究变量，依照运动中机械载荷带来的空气弹簧气室压力变化进行气室载荷加载，研究空气弹簧气室压力对构架疲劳强度的影响。结果表明：在4种焊缝特征类型中，上盖板单边角焊缝焊根和背面焊接位置角焊缝基于JIS标准疲劳设计未满足疲劳强度要求；侧梁上盖板单边角焊缝受空气弹簧气室压力交变作用影响，焊根部位疲劳安全系数降低7.1%，焊趾部位疲劳安全系数降低29.8%；而侧梁内侧、外侧双边角焊缝受空气弹簧气室压力交变作用影响较小，疲劳安全因子降低仅2%左右。
Abstract
In order to ensure the structural safety of railway vehicles, aiming at the welded frame with air spring for secondary suspension, based on JIS standard fatigue evaluation method and Goodman diagram method, loading is carried out according to the main operating conditions of EN 13749. From the view of engineering application, according to whether the frame can be monitored and inspected in time from outside after welded, the unilateral fillet weld of upper cover plate of side sill was divided into the inner welding root and the outer welding toe, and the side sill bilateral fillet weld was divided into the inside fillet weld and the outside fillet weld for fatigue checking respectively. The comprehensive fatigue assessment of the side sill of the welded frame was completed.Taking the air spring chamber pressure as the research variable, the influence of air spring chamber pressure on the fatigue strength of the frame was studied by loading the air spring chamber pressure according to the change of the air spring chamber pressure caused by the mechanical load in motion. The results showed that: among the four types of weld characteristics, unilateral side fillet weld root of upper cover plate and back weld position fillet weld did not meet the fatigue strength requirement based on JIS standard. Under the influence of the air spring chamber pressure alternating action, the fatigue safety factor at the root of the unilateral fillet weld decreases by 7.1%, and the fatigue safety factor at the toe of the unilateral fillet weld decreases by 29.8%. However, the effect of air spring chamber pressure alternation on the both sides bilateral fillet weld of side sill is less, and the fatigue safety factor decreases by only 2%.
关键词
焊接构架空气弹簧疲劳强度JIS标准Goodman图仿真
Keywords
welded frameair springfatigue strengthJIS standardGoodman diagramsimulation
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