A1 Journal article (refereed), original research

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


Publication Details
Authors: Amraei Mohsen, Jiao Hui, Zhao Xiao-Ling, Tong Le-Wei
Publisher: Elsevier
Publication year: 2017
Language: English
Related Journal or Series Information: Thin-Walled Structures
Volume number: 120
Start page: 260
End page: 268
Number of pages: 9
ISSN: 0263-8231
eISSN: 1879-3223
JUFO-Level of this publication: 2
Open Access: Not an Open Access publication

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.


Last updated on 2019-08-01 at 13:05