Abstract
The use of reinforcements in adhesive joints makes the stress distribution more uniform, improving their mechanical performance and adhesion. The present paper aims to verify the effectiveness and efficiency of the insertion of nylon 6 fabric in the adhesive layer, to study their applicability and functionality in building components. The increase in stiffness achieved by applying nylon 6 fabric in the adhesive layer between glass and GFRP pultruded profiles and steel laminates applied to GFRP beams is investigated. Three different epoxy adhesives and one epoxy resin are used and compared. Three different types of tests are carried out in order to study the different properties of the reinforcement system: tensile tests on GFRP/GFRP single-lap adhesive joints, with and without nylon fabric reinforcement; tensile tests on double-lap adhesive joints between float glass and pultruded GFRP profiles reinforced with nylon fabric according to four configurations (in the middle plane of the adhesive layer, on the glass surfaces, on the GFRP surfaces, on both GFRP and glass configurations) to verify the influence of its position; three-point bending tests on long GFRP tubular profiles reinforced with steel plates and nylon fabric in different configurations, to study resistance to bending loads. The results from the experimental campaign show the effectiveness of the reinforcement system using nylon fabric 6. In general, both a reduction in ultimate strength and an increase in joint stiffness compared to unreinforced configurations are observed.
Highlights
I n recent years, GFRP (Glass Fiber Reinforced Polymer) pultruded profiles are increasingly used in different fields of application, thanks to various benefits such as reduced weight, ease of installation, low electrical and thermal conductivity, corrosion resistance and durability in critical exposure conditions [1,2,3]
Three different types of tests are carried out in order to study the different properties of the reinforcement system: tensile tests on GFRP/GFRP singlelap adhesive joints, with and without nylon fabric reinforcement; tensile tests on double-lap adhesive joints between float glass and pultruded GFRP profiles reinforced with nylon fabric according to four configurations to verify the influence of its position; three-point bending tests on long GFRP tubular profiles reinforced with steel plates and nylon fabric in different configurations, to study resistance to bending loads
The present study aims to evaluate the effect of nylon 6 fiber reinforcement on the mechanical performance of GFRPglass adhesive joints and on the flexural performance of GFRP profiles reinforced with steel plates
Summary
I n recent years, GFRP (Glass Fiber Reinforced Polymer) pultruded profiles are increasingly used in different fields of application, thanks to various benefits such as reduced weight, ease of installation, low electrical and thermal conductivity, corrosion resistance and durability in critical exposure conditions [1,2,3]. These features configure GFRP profiles as a valid alternative to traditional materials in the field of civil engineering. This is partly due to the wide variation of the physical properties of the adhesives along with their nonlinear properties and unknown behavior during their service life
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