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Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP

Citation

Amraei, M and Jiao, H and Zhao, X-L and Tong, L-W, Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP, Thin-Walled Structures, 120 pp. 260-268. ISSN 0263-8231 (2017) [Refereed Article]

Copyright Statement

2017 Elsevier Ltd

DOI: doi:10.1016/j.tws.2017.09.004

Abstract

This paper presents a study on the residual stress, hardness and fatigue behaviour of butt-welded high strength square hollow section (SHS) steel tubes strengthened with carbon fibre reinforced polymer (CFRP). SHS tubes, with a nominal yield stress of 780 MPa and an ultimate tensile strength of 860 MPa, were butt-welded using the Gas Tungsten Arc Welding (GTAW) welding method. The hardness in the heat affected zone (HAZ) dropped to around 80% of that of the parent metal of the SHS steel. The strength in HAZ of the butt-welded SHS tubes is about 93% of that of the parent metal of the SHS tube. The residual stress of the butt-welded SHS tubes is about 2050% 25-45% of the yield stress along the longitudinal direction and 15% of the yield stress along the transverse direction. The fatigue life of CFRP strengthened butt-welded SHS beams was extended for about 5 times comparing to the butt-welded beams without CFRP strengthening.

Item Details

Item Type:Refereed Article
Keywords:high strength steel, heat affected zone, hardness, residual stress, fatigue, CFRP strengthening
Research Division:Engineering
Research Group:Civil Engineering
Research Field:Structural Engineering
Objective Division:Construction
Objective Group:Construction Materials Performance and Processes
Objective Field:Metals (e.g. Composites, Coatings, Bonding)
Author:Jiao, H (Dr Hui Jiao)
ID Code:121215
Year Published:2017
Web of Science® Times Cited:1
Deposited By:Engineering
Deposited On:2017-09-18
Last Modified:2018-06-18
Downloads:0

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