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

Amraei, M, Jiao, H ORCID: 0000-0001-8877-7268, Zhao, X-L and Tong, L-W 2017 , 'Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP' , Thin-Walled Structures, vol. 120 , pp. 260-268 , doi: 10.1016/j.tws.2017.09.004.

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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 20–50% 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 Type: Article
Authors/Creators:Amraei, M and Jiao, H and Zhao, X-L and Tong, L-W
Keywords: high strength steel, heat affected zone, hardness, residual stress, fatigue, CFRP strengthening
Journal or Publication Title: Thin-Walled Structures
Publisher: Elsevier Sci Ltd
ISSN: 0263-8231
DOI / ID Number: 10.1016/j.tws.2017.09.004
Copyright Information:

© 2017 Elsevier Ltd

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