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

Mohsen Amraei; Hui Jiao; Xiao Ling Zhao; Le Wei Tong

doi:10.1016/j.tws.2017.09.004

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

Mohsen Amraei, Hui Jiao, Xiao Ling Zhao, Le Wei Tong

Research output: Journal article publication › Journal article › Academic research › peer-review

23 Citations (Scopus)

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.

Original language	English
Pages (from-to)	260-268
Number of pages	9
Journal	Thin-Walled Structures
Volume	120
DOIs	https://doi.org/10.1016/j.tws.2017.09.004
Publication status	Published - Nov 2017
Externally published	Yes

Keywords

CFRP strengthening
Fatigue
Hardness
Heat affected zone
High strength steel
Residual stress

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanical Engineering

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10.1016/j.tws.2017.09.004

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title = "Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP",

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.",

keywords = "CFRP strengthening, Fatigue, Hardness, Heat affected zone, High strength steel, Residual stress",

author = "Mohsen Amraei and Hui Jiao and Zhao, {Xiao Ling} and Tong, {Le Wei}",

note = "Funding Information: The authors are grateful for the support from SSAB in providing the testing materials. Thanks are given to the workshop technicians at the School of Engineering and ICT at UTAS for the welding of the specimens and the setup of the test rig. The financial support from the Australian Research Council ( DP150100442 ) and Shanghai Civil Engineering Peak Discipline Program (No. TMGFXK-2015 ) is acknowledged. Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

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N1 - Funding Information: The authors are grateful for the support from SSAB in providing the testing materials. Thanks are given to the workshop technicians at the School of Engineering and ICT at UTAS for the welding of the specimens and the setup of the test rig. The financial support from the Australian Research Council ( DP150100442 ) and Shanghai Civil Engineering Peak Discipline Program (No. TMGFXK-2015 ) is acknowledged. Publisher Copyright: © 2017 Elsevier Ltd

PY - 2017/11

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N2 - 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.

AB - 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.

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KW - Fatigue

KW - Hardness

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KW - High strength steel

KW - Residual stress

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

Abstract

Keywords

ASJC Scopus subject areas

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