Experimental study on fatigue performance of high strength steel welded joints

被引：56

作者：

Guo, Hongchao ^{[1
,2
]}

Wan, Jinhuai ^{[1
,2
]}

Liu, Yunhe ^{[1
,3
]}

Hao, Jiping ^{[4
]}

机构：

[1] Xian Univ Technol, State Key Lab Base Ecohydraul Engn Arid Area, 5 Jinhua Rd, Xian 710048, Shaanxi, Peoples R China

[2] Xian Univ Technol, Sch Civil Engn & Architecture, 5 Jinhua Rd, Xian 710048, Shaanxi, Peoples R China

[3] Xian Univ Technol, Inst Water Resources & Hydroelect Engn, 5 Jinhua Rd, Xian 710048, Shaanxi, Peoples R China

[4] Xian Univ Architecture & Technol, Dept Civil Engn, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China

来源：

THIN-WALLED STRUCTURES | 2018年 / 131卷

基金：

中国国家自然科学基金;

关键词：

High-strength steel; Butt weld; Cross fillet weld; Fatigue limit; Fracture morphology; Fatigue damage;

D O I：

10.1016/j.tws.2018.06.023

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The welded joint of steel structure is prone to occur fatigue fracture under dynamic loads. In this paper, an experimental study on the fatigue performance of base material, butt weld, and cross fillet weld of high-strength steels were investigated. The S-N curve was fitted, and the corresponding fatigue life was predicted. Results corroborate that the base material of high-strength steel possess high fatigue resistance. AISC360 and EC3 standard design curves are applicable for the evaluation of the butt weld fatigue performance of Q460D and possess adequate safety margin, but only suitable for low-fatigue life estimation of Q690D butt weld. With respect to cross fillet weld, AISC360 design curve not only is suitable for the fatigue life analysis of Q460D and Q690D but also has enough safety margins, while EC3 and BS7608 codes possess relatively low fatigue limit. In addition, a quantitative analysis on fatigue fracture was conducted on the basis of fatigue damage theory, and the fatigue crack propagation law was disclosed on the basis of fracture morphology. The crack propagation law before instant fracture is consistent with damage development, and the fatigue striation width increases gradually with damage development. The fast crack propagation stage accounts for a small proportion in the fatigue life, thereby indicating that this stage is insufficiently developed.

引用

页码：45 / 54

页数：10

共 26 条

[1] The effect of misalignment on the fatigue strength of welded cruciform joints [J].