Wet thermo-mechanical behavior of steel–CFRP joints – An experimental study |
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| Affiliation: | 1. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales, Sydney 2052, Australia;2. Cooperative Research Centre for Advanced Composite Structures, 1/320 Lorimer Street, Port Melbourne, Victoria, Australia;1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Structural Engineering Research Laboratory, Dübendorf, Switzerland;2. EPFL, Swiss Federal Institute of Technology Lausanne, Steel Structure Laboratory (ICOM), Lausanne, Switzerland;3. Department of Civil Engineering, University of Arkansas, Fayetteville, AR, USA;4. ETHZ, Swiss Federal Institute of Technology Zürich, Institute of Structural Engineering (IBK), Zürich, Switzerland;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. School of Civil Engineering, The University of Queensland, QLD 4072, Australia;3. School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, The University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia;1. Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Vic 3122, Australia;2. Department of Civil Engineering, University of Baghdad, Baghdad, Iraq;1. Key Laboratory of Performance Evolution and Control for Engineering Structures (Tongji University), Ministry of Education, Shanghai 200092, China;2. Department of Structural Engineering, Tongji University, Shanghai 200092, China;3. Nippon Steel & Sumikin Materials Co., Ltd., Tokyo 103-0024, Japan |
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| Abstract: | The long term durability of CFRP strengthened steel structures is a key parameter for their safe use and effective design. Strengthened members can be subjected to different environmental conditions and loading scenarios during their service life, the effect of which on the failure mechanism of the strengthened member requires fundamental investigations. This paper presents an experimental investigation into the effects of wet thermo-mechanical loading on the bond strength and the failure mode of steel–CFRP single lap joints. A total of thirty four steel–CFRP single lap shear specimens were prepared and exposed to different combinations of wet thermal cycle ranges and sustained loads. The results show that these conditions (wet thermal cycles and sustained loads) have little impact on the bond strength of steel–CFRP lap joint when applied separately. However, when applied simultaneously, the bond strength of the joint is significantly reduced with failure observed at less than 30% of the static strength under temperatures that are well below the glass transition temperature of the adhesive. |
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| Keywords: | A Polymer-matrix composites (PMCs) B Debonding B Thermomechanical D Mechanical testing Steel–FRP joints |
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