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Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP
AbstractThis 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 780MPa and an ultimate tensile strength of 860MPa, 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.
HighlightsMeasured residual stress and hardness of butt-welded high strength square hollow section (SHS).Examined microstructure of heat-affected zone (HAZ) in welded high strength SHS.Conducted fatigue tests on welded high strength SHS with and without CFRP strengthening.CFRP strengthening increased fatigue life about 5 times.
Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP
AbstractThis 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 780MPa and an ultimate tensile strength of 860MPa, 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.
HighlightsMeasured residual stress and hardness of butt-welded high strength square hollow section (SHS).Examined microstructure of heat-affected zone (HAZ) in welded high strength SHS.Conducted fatigue tests on welded high strength SHS with and without CFRP strengthening.CFRP strengthening increased fatigue life about 5 times.
Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP
Amraei, Mohsen (author) / Jiao, Hui (author) / Zhao, Xiao-Ling (author) / Tong, Le-Wei (author)
Thin-Walled Structures ; 120 ; 260-268
2017-09-05
9 pages
Article (Journal)
Electronic Resource
English
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