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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
Related URLs:	Google Scholar: Jiao, H UTAS Profile: Jiao, H
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