Numerical model of glulam beam delamination in dependence on cohesive strength

Kawecki, Bartosz; Podgórski, Jerzy

doi:10.1063/1.5019059

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…To model the behavior of the GLT beam in a plane stress, the authors proposed to use Simulia ABAQUS software (2019, Dassault Systemes, Paris, France). A constitutive law for a plane stress orthotropic timber material (Equation (1) and Figure 6) was defined as in [18] and [22]: [ε11ε22γ12]=[ 1E1−ν12E10−ν21E2 1E20001G12][σ11σ22τ12]…”

Section: Fem Model Assumptionsmentioning

confidence: 99%

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Numerical Analysis and Its Laboratory Verification in Bending Test of Glue Laminated Timber Pre-Cracked Beam

Kawecki

Podgórski

2019

Materials

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The paper describes an approach to model glue laminated timber (GLT) made of pinewood (softwood), taking into account damage processes in timber and adhesive layers. An example of a pre-cracked beam has been presented. Obtaining necessary material properties has been supported by several finite elements models (FEM), laboratory tests and a wide literature survey. The authors have taken into consideration an orthotropic material with damage for timber lamellas and isotropic traction separation law for bonding layers. Both plane stress CPS8R and COH2D4 finite elements from the Simulia ABAQUS system or mesh density, used in the numerical analyses, have been carefully chosen and tested. The GLT beam model has been verified on the basis of several values, using two types of testing techniques—MTS 809 machine measurements and digital image correlation (DIC). Additional results revision has been provided by measuring a crack shear displacement (CSD), using the original laboratory test setup by the authors’ idea. Finally, some conclusions and introductory recommendations for modelling a glue laminated timber in a plane stress have been formulated. The paper is a part of a wider research on timber-polymer composites, which is still under development.

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Section: Fem Model Assumptionsmentioning

confidence: 99%

“…The penalty stiffness K was calculated based on the stiffness of the bonded elements. Precise principals for the penalty stiffness selection are presented in several papers [15,16,17] and analyzed by the authors of [22]. Graphical representation of the traction-separation law for cohesive elements [24] is given in Figure 7.…”

Section: Fem Model Assumptionsmentioning

confidence: 99%

Numerical Analysis and Its Laboratory Verification in Bending Test of Glue Laminated Timber Pre-Cracked Beam

Kawecki

Podgórski

2019

Materials

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“…where K i is the interface stiffness [N/mm 3 ], α is a parameter much larger than 1, here 50 [29,30], E l is the longitudinal Young's modulus of timber [MPa], h 1 is the single wood lamella height [mm].…”

Section: And G3)mentioning

confidence: 99%

Predicted and Experimental Bending Behaviour of Glulam Bonded by RPF Adhesive

Kytka,

Gašparík,

Sahula

et al. 2024

Materials

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In this study, alder, spruce, and beech woods were used for homogeneous symmetric, inhomogeneous symmetric (combined) and inhomogeneous non-symmetric glued laminated timber (glulam) beams glued with resorcinol phenol formaldehyde (RPF) adhesive. The aim of this paper is to determine and compare the modulus of elasticity of glulam beams using three methods, i.e., analytical calculation, numerical model (FEM) and experimental testing. As an additional characteristic, the bending strength (MOR) of the beams was determined during experimental testing. Analytical calculation was used to calculate the modulus of elasticity (MOE) of glued laminated timber based on the knowledge of the modulus of elasticity of solid wood and to estimate the location of the neutral axis during bending. According to calculations, for symmetrical combinations, the deviation from the real neutral axis does not exceed 5%. In the case of the modulus of elasticity, the deviation is an average of 4.1% from that of the actual measured beams. The numerical model includes finite element modelling, where the deflection of the modelled beams can be calculated with a deviation of up to 10%. The last method was experimental testing of glued beams using four-point bending, in which, among homogeneous beams, beech glulam beams achieved the highest MOE and MOR, while alder glulam beams achieved the lowest. The combination of wood species resulted in an increase in both MOE and MOR compared to homogeneous spruce and alder beams.

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“…Cohesive zone delamination model in mode I and mode II was described in many publications, including [17][18][19]. According to these papers and authors' analyses in publication [20], cohesive zone parameters should be defined as follows.…”

Section: Glue Parameters Determinationmentioning

confidence: 99%

Numerical and Experimental Research on Delamination of Glulam Elements

Kawecki

Podgórski

2018

Archives of Civil Engineering

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The paper presents numerical and experimental research on glulam delamination in a double lap connection with predominant shear stresses. Laboratory tests and wide literature survey enabled to determine timber and glue joint parameters. Cohesive zone theory, generally used for epoxy matrix and fiber reinforced composites, was adopted to modelling glue layer delamination in glulam elements. Numerical models were validated with laboratory tests.

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Numerical model of glulam beam delamination in dependence on cohesive strength

Cited by 4 publications

References 5 publications

Numerical Analysis and Its Laboratory Verification in Bending Test of Glue Laminated Timber Pre-Cracked Beam

Numerical Analysis and Its Laboratory Verification in Bending Test of Glue Laminated Timber Pre-Cracked Beam

Predicted and Experimental Bending Behaviour of Glulam Bonded by RPF Adhesive

Numerical and Experimental Research on Delamination of Glulam Elements

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