Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4928360 | Thin-Walled Structures | 2017 | 9 Pages |
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 780Â MPa and an ultimate tensile strength of 860Â 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.
Related Topics
Physical Sciences and Engineering
Engineering
Civil and Structural Engineering
Authors
Mohsen Amraei, Hui Jiao, Xiao-Ling Zhao, Le-Wei Tong,