Experimental and numerical investigation of adhesively bonded single lap and thick adherents joints between pultruded GFRP composite profiles

Ungureanu, Dragoş; Ţăranu, Nicolae; Lupăşteanu, Vlad; Isopescu, Dorina Nicolina; Oprişan, Gabriel; Mihai, Petru

doi:10.1016/j.compositesb.2018.03.041

Cited by 25 publications

(8 citation statements)

References 23 publications

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“…According to the Mechanical Theory, the degree of adhesion that may be obtained for an adhesively bonded joint is directly linked to the roughness of the substrates [25,26]. Thus, 30 of the 34 steel plates were sandblasted to increase the specific roughness of the surface that comes into contact with the adhesive [27].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…After all the necessary materials for assembling the specimens were shaped to their nominal dimensions, the first step consisting in preparing the steel surface was performed. According to the Mechanical Theory, the degree of adhesion that may be obtained for an adhesively bonded joint is directly linked to the roughness of the substrates [25,26]. Thus, 30 of the 34 steel plates were sandblasted to increase the specific roughness of the surface that comes into contact with the adhesive [27].…”

Section: Experimental Set-upmentioning

confidence: 99%

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Structural Response of Bonded Joints between FRP Composite Strips and Steel Plates

et al. 2021

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This paper presents the outcomes of an experimental and numerical study performed on epoxy-bonded single lap joints (SLJs) between carbon fiber-reinforced polymer (CFRP) composite strips and steel elements. For the experimental program, 34 specimens were prepared by varying the type of the composite strip and the type of adhesives and their thicknesses; all specimens were loaded in axial tension up to failure. The specific failure mechanisms were identified and commented on the basis of the performed tests, and the load–displacement curves were plotted. Additionally, the strain distributions along the bond lengths at different load stages, the shear stress–displacements (slip) variations and the stress–strain distributions for the CFRP strips were plotted and investigated. The numerical simulations, based on 3D finite element method (FEM) analysis, provided consistent results, in good agreement with the experimental ones for all parameters that were investigated and discussed in this paper.

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

Structural Response of Bonded Joints between FRP Composite Strips and Steel Plates

et al. 2021

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“…Steel (SAE 1010) laps with dimensions of 4.76 x 25.4 x 100 mm and Poisson ratio of 0.30 were used as substrates [17,18]. Steel surfaces were mechanically treated in order to control and minimize roughness.…”

Section: Single Lap Jointsmentioning

confidence: 99%

The role of bondline thickness on mechanical properties of bio-based polyurethane

et al. 2019

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Bio-based adhesives have been largely applied on several applications in many industrial areas, including automotive and laminated food packaging. Polyurethanes (PU) occupy a leading position among the most used bio-based polymers due to their large range of properties and application versatility. Recent works reported that PU obtained from castor oil and Kraft lignin as polyol developed high mechanical properties and blend miscibility. In spite of its well-known mechanical behavior, additional investigations might support the application of this bio-based PU as adhesive. In this context, our work investigated the effect of adhesive (bondline) thickness variation (size effect) on shear modulus of a bio-based polyurethane under finite deformation and related shear stress distribution. Polyurethane was obtained using a blend of Kraft lignin and castor oil as polyol (20 wt% of Kraft lignin) and applied as adhesive for metal bonding, in which adhesive thickness changed from tens of micrometers up to 220 micrometers. Steel plates were used as substrates and adhesive shear modulus was evaluated using substrates with large thickness (4.76 mm), which minimized the effect of substrate deformation on shear modulus measurement. Single lap joints were uniaxial loaded in order to generate the shear stress on adhesive bondline. Additionally, shear modulus changes were simulated by finite element analysis (FEA), analytical models and compared to experimental data. Results revealed the size effect and pointed to high shear modulus of the PU bondline, justifying its use as an adhesive for structural applications.

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“…In order to overcome this issue, various fiber-reinforced polymer (FRP) composite elements have been developed as an alternative to steel reinforcements. Despite their advantageous features, such as high strength-to-weight ratio and ease of application [18][19][20], using FRP composite elements in strengthening applications for URM structures is usually associated with several possible limitations. These are the potential debonding of externally applied FRP strips, the incompatibility between most of the epoxy systems and many types of substrates (due to the large stiffness discrepancies) and the unsatisfactory behavior of common resin products at high and low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Diagonal Tensile Test on Masonry Panels Strengthened with Textile-Reinforced Mortar

et al. 2021

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This study presents the results of an experimental and numerical program carried out on unreinforced masonry panels strengthened by textile-reinforced mortar (TRM) plastering. For this purpose, five panels were constructed, instrumented and tested in diagonal shear mode. Two panels were tested as reference. The first reference panel was left unstrengthened, while the second one was strengthened by a traditional self-supporting cement mortar matrix reinforced with steel meshes. The remaining three panels were strengthened by TRM plastering applied on one or both faces and connected with transversal composite anchors. The numerical and the experimental results evidenced a good effectiveness of the TRM systems, especially when applied on both panel facings.

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Experimental and numerical investigation of adhesively bonded single lap and thick adherents joints between pultruded GFRP composite profiles

Cited by 25 publications

References 23 publications

Structural Response of Bonded Joints between FRP Composite Strips and Steel Plates

Structural Response of Bonded Joints between FRP Composite Strips and Steel Plates

The role of bondline thickness on mechanical properties of bio-based polyurethane

Diagonal Tensile Test on Masonry Panels Strengthened with Textile-Reinforced Mortar

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