A Study of Bond of Structural Timber and Carbon Fiber Reinforced Polymer Plate

Lee, Yongtaeg; Park, Junho; Hong, Seong-Uk; Kim, Seunghun

doi:10.5755/j01.ms.21.4.9702

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Arriaga et al [23] performed a block shear test (Figure 3c) with a GFRP (Glass Fibre Reinforced Polymer) Sena-Cruz et al [24] and Fava et al [25] carried out the pull-out test of two types of composite plates -GFRP and CFRP, glued on various lengths (Figure 3d). Lee et al [26] presented the tests on CFRP strips separated from wood, as shown in Figure 3e.…”

Section: Tests On Wood-wood and Wood-cfrp Adhesively Bonded Jointsmentioning

confidence: 99%

Numerical Modelling and Experimental Testing on Polyurethane Adhesively Bonded Joints Behaviour in Wood-Wood and Wood-Carbon Fibre Reinforced Polymer Layouts

Kawecki¹

2023

Adv. Sci. Technol. Res. J.

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Scientists do a variety of laboratory tests on timber and wood-containing composites. An example is adhesively bonded joints in such materials. Despite a wide range of empirical research, consideration of adhesive layers or surfaces in a structure is commonly done in a very simplified manner -they are often modelled as a perfect connection between adherends. It means the cohesive stiffness and opportunity of progressive delamination are neglected. This may lead to an overestimation of the structural load-bearing capacity. The article presents wood-wood and wood-carbon fibre reinforced polymer (CFRP) adhesively bonded joints' investigations, based on own experimental testing technique (covering a current one as a Digital Image Correlation), analytical double-lap model for adhesives and advanced numerical Finite Element approach. The aim of the paper is to give the guidelines for complex, non-linear modelling of connections in glue laminated timber and wood-CFRP composites that can be utilised for many purposes.

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Section: Tests On Wood-wood and Wood-cfrp Adhesively Bonded Jointsmentioning

confidence: 99%

Numerical Modelling and Experimental Testing on Polyurethane Adhesively Bonded Joints Behaviour in Wood-Wood and Wood-Carbon Fibre Reinforced Polymer Layouts

Kawecki¹

2023

Adv. Sci. Technol. Res. J.

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“…Despite the simplicity and rapid application of FRP on existing structures, the major difficulty with timber strengthened with the EBR method is the debonding before the fibers reach their ultimate strength. 6 The externally bonded reinforcement on groove (EBROG) technique is one practical approach to delay or avoid premature debonding. Mostofinejad and Kashani 7 proposed this technique to strengthen concrete beams with FRP strips.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic evaluation for the detection of contact defects of the timber and fiber-reinforced polymer

Kami

Toufigh

2022

Structural Health Monitoring

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Fiber-reinforced polymer (FRP) composites have been used tremendously to repair and rehabilitate timber structures due to their formability, ease of use, and high specific strength. The bond quality between FRP and timber substrate is critical for complete composite action. In this paper, a comprehensive set of linear and nonlinear ultrasonic methods was performed to investigate the bond between carbon-FRP (CFRP) and timber. For this purpose, 126 specimens of reinforced timber were prepared. Two techniques were considered to bond CFRP and timber: (1) externally bonded reinforcement (EBR), and (2) externally bonded reinforcement on the groove (EBROG). The effect of the number of CFRP layers, adhesive types, the extent of artificial surface defects, and the depth of the groove were contemplated. By analyzing linear methods, differences in stiffness and modulus of elasticity of CFRP and timber led to velocity variation and attenuation phenomena. Higher-order harmonics were also used to investigate the nonlinear behavior of ultrasonic waves at the bond. The second harmonic generation detected surface damage at CFRP and timber bond. Single-lap shear tests were employed to determine the bond strength of CFRP and timber and evaluate the accuracy of the linear and nonlinear methods. Finally, using the linear and nonlinear features extracted from the ultrasonic response signals and available physical parameters, three artificial neural networks (ANNs) were developed to predict three important CFRP-to-timber bond characteristics quantitively: (1) to predict the groove depth, (2) to predict the volume of voids, and (3) to predict the CFRP-to-timber bond strength. The three proposed models achieved an average [Formula: see text] of 0.95, 0.96, and 0.92 in predicting the groove depth, voids volume, and bond strength, respectively.

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“…Arriaga [ 19 ] performed a block shear test ( Figure 3 c) with GFRP (glass fibre-reinforced polymer), and Sena-Cruz [ 20 ] and Fava [ 21 ] carried out a pull-out test of two types of composite plates—GFRP and CFRP—glued at varying lengths ( Figure 3 d). Lee [ 22 ] presents tests performed on CFRP strips separated from wood as shown in Figure 3 e.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Glue Cohesive Stiffness on the Elastic Performance of Bent Wood–CFRP Beams

Kawecki

Podgórski

2020

Materials

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This paper presents experimental, theoretical and numerical studies of wood-CFRP beams bonded with polyurethane (PUR) adhesive. The analyses include two types of CFRP (carbon fibre-reinforced polymer) strengthening configurations and pure glue laminated timber beams as a reference. Through detailed analyses of a double-lap connection on blocks with and without CFRP strips, the authors state that neglecting the cohesive stiffness of adhesive layers may lead to an overestimation of an overall beam’s stiffness. This is significant with wood–CFRP connections, which showed values two times lower than with wood–wood connections. Theoretical modelling of the equivalent area used in a theory of composites provided much stiffer behaviour of the beams than in laboratory experiments. It proves that a PUR glue eliminates the possibility of using simple models that assume a perfect connection between bonded parts. These conclusions led the authors to use the finite element method (FEM) to take into account the cohesive stiffness. The FEM, based on the properties obtained from a double-lap joint analysis, allowed for the precise prediction of the elastic stiffness of the beams.

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A Study of Bond of Structural Timber and Carbon Fiber Reinforced Polymer Plate

Cited by 5 publications

References 10 publications

Numerical Modelling and Experimental Testing on Polyurethane Adhesively Bonded Joints Behaviour in Wood-Wood and Wood-Carbon Fibre Reinforced Polymer Layouts

Numerical Modelling and Experimental Testing on Polyurethane Adhesively Bonded Joints Behaviour in Wood-Wood and Wood-Carbon Fibre Reinforced Polymer Layouts

Ultrasonic evaluation for the detection of contact defects of the timber and fiber-reinforced polymer

The Effect of Glue Cohesive Stiffness on the Elastic Performance of Bent Wood–CFRP Beams

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