A comparison of the fatigue behavior between S355 and S690 steel grades

被引：184

作者：

de Jesus, Abilio M. P. ^{[1
]}

Matos, Rui ^{[2
]}

Fontoura, Bruno F. C. ^{[1
]}

Rebelo, Carlos ^{[2
]}

da Silva, Luis Simoes ^{[2
]}

Veljkovic, Milan ^{[3
]}

机构：

[1] Univ Tras Os Montes & Alto Douro, Sch Sci & Technol, Dept Engn, IDMEC, P-5001801 Quinta De Prados, Vila Real, Portugal

[2] Univ Coimbra, Dept Civil Engn, ISISE, Coimbra, Portugal

[3] Lulea Univ Technol, S-95187 Lulea, Sweden

来源：

JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH | 2012年 / 79卷

关键词：

Fatigue; Crack propagation; S690 steel grade; S355 steel grade; High strength steel; Mild steel;

D O I：

10.1016/j.jcsr.2012.07.021

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The use of higher strength steels allows the design of lighter, slenderer and simpler structures. Nevertheless, the increase of the yield strength of the steels does not correspond to a proportional increase of fatigue resistance, which makes the application of high strength steels on structures prone to fatigue, a major concern of the design. This paper presents a comparison of the fatigue behavior between the 5355 mild steel and the S690 high strength steel grades, supported by an experimental program of fatigue tests of smooth specimens, performed under strain control, and fatigue crack propagation tests. Besides the cyclic elastoplastic characterization, the fatigue tests of smooth small size specimens allow the assessment of the fatigue crack initiation behavior of the materials. Results show that the S690 steel grade presents a higher resistance to fatigue crack initiation than the S355 steel. However, the resistance to fatigue crack propagation is lower for the S690 steel grade, which justifies an inverse dependence between static strength and fatigue life, for applications where fatigue crack propagation is the governing phenomenon. Consequently, the design of structural details with the S690 steel should avoid sharp notches that significantly reduce the fatigue crack initiation process. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：140 / 150

页数：11

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