电焊机2018，Vol.48Issue(3)：171-175,5.DOI:10.7512/j.issn.1001-2303.2018.03.32
不同评定方法对高速列车A7N01铝合金焊接接头疲劳强度的影响
Effects on fatigue properties of A7N01-T5 aluminum alloy welded joints for high-speed train by using different evaluation methods
王勇 1张志毅 1果伟 1吴向阳 1朱忠尹2
作者信息
- 1. 中车青岛四方机车车辆股份有限公司,山东青岛266111
- 2. 西南交通大学材料科学与工程学院,四川成都610031
- 折叠
摘要
Abstract
Experiments and analysis were made on A7N01S-T5 aluminum alloy welded joints.Nominal S-N curves and the fatigue strength under different survival rate were obtained through the tension-tension fatigue tests.The hot spot stress,gap stress were obtained by finite element method,and then the fatigue properties were evaluated by using the nominal stress method,hot spot stress and gap stress method.The results showed that the mean fatigue strength △σ was 45.77 MPa by the tension-tension load fatigue test,and after corrections of two standard plus or minus deviations,the fatigue strength △σK was 39.89 MPa under the 95％ reliability.The hot spot stress concentration factor was 1.034 and the hot spot stress fatigue strength was 47.39 MPa.The gap stress fatigue strength was 123.03 MPa.The fatigue strength under the gap stress method had the largest value,the value under the hot spot stress method was in the medium and the value under the nominal stress method was the smallest.The nominal stress method was more conservative than the other two but the hot spot stress method and gap stress method both need to evaluate the detailed factors and analyze the stress condition accurately so as to make sure the safety of high-speed trains.关键词
A7N01铝合金焊接接头/疲劳强度评定/名义应力法/热点应力法/缺口应力法Key words
A7N01 aluminum alloy welded joints/fatigue strength evaluation/nominal stress method/hot spot method/gap stress method分类
交通工程引用本文复制引用
王勇,张志毅,果伟,吴向阳,朱忠尹..不同评定方法对高速列车A7N01铝合金焊接接头疲劳强度的影响[J].电焊机,2018,48(3):171-175,5.
