Method of Estimation of Laminated Wood Properties

Brezović, Mladen; Pervan, Stjepan; Petrak, Josipa; Prekrat, Silvana

doi:10.5552/drind.2018.1738

Cited by 4 publications

(5 citation statements)

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“…1. Elastic properties and shrinkage coefficients of beech wood (Fagus sylvatica L.), ρ=0,75 g/cm 3 [10], [11]…”

Section: Research Objective and Methodologymentioning

confidence: 99%

“…Different veneer layouts in plywood structure have a remarkable impact on plywood tensile strength [1]. Investigation of veneer layouts impact on strength of laminated wood and evaluation of mechanical properties of laminated wood was analysed by computer programs [2] and [3]. The stresses and strain state of laminated wood exposed to mechanical load was analysed by numerical methods.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dimensional and Shape Stability of Plywood Seat

Hajdarevic¹,

Obućina²,

Delić³

et al. 2019

DAAAM Proceedings

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In this paper is performed the strain analysis of the common laminated wood seat shell exposed to the room conditions immediately after moulding. Experimental dimensional and shape stability evaluation is carried out by measuring the displacement of the three points on the backrest of the shell, which was placed in the indoor environment for 21 days. The results showed that the dominant displacement occurred in the initial days of testing during which the wood of the seat shell was achieved the equilibrium moisture content. Finite element analysis is conducted by 3D linear elastic model for orthotropic materials. Numerical calculation was used to determine displacement caused by the difference of the moisture content of the wood before and after the experimental examination. The numerical result showed smaller displacement of the backrest points than the measured displacements. The results also indicate that numerical calculations gave approximate data of the behaviour of the complex shape of laminated veneer products due to changes in moisture content of wood because of indoor condition change.

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“…1. Elastic properties and shrinkage coefficients of beech wood (Fagus sylvatica L.), ρ=0,75 g/cm 3 [10], [11]…”

Section: Research Objective and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dimensional and Shape Stability of Plywood Seat

Hajdarevic¹,

Obućina²,

Delić³

et al. 2019

DAAAM Proceedings

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show abstract

“…An examination of the influence of the amount of carbon fibers in the strengthening of plywood with CFRP products on its mechanical properties and, above all, on its bending properties was presented in research by Brezović et al [13]. The bending properties are perpendicular to the plane and the shear properties of the reinforced five-layer plywood were tested.…”

Section: Literature Reviewmentioning

confidence: 99%

Flexural Properties in Edgewise Bending of LVL Reinforced with Woven Carbon Fibers

et al. 2023

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This paper presents the results of experimental testing of the bending strength and modulus of elasticity in edgewise bending of unreinforced and reinforced seven-layer LVL (laminated veneer lumber) poplar veneer panels. The aim of the research is to determine the influence of woven carbon fibers on the improvement of the bending properties and modulus of elasticity of LVL bending in the plane of the plate, as well as the influence of adhesives on the bending properties of the composite product, in order to test the potential of using this newly obtained material as a structural element. Bending was performed on small-scale samples. The main research task is the examination of three types of reinforcement, which differ from each other in position, orientation, and number of layers of reinforcement, using two different types of adhesives: epoxy adhesive and Melamine Urea Formaldehyde Resins (MUF). The composite material was produced in four different combinations in relation to the orientation and position of the reinforcement in the layup. The applied reinforcement is defined through three different configurations (EK1, EK2, and EK3) and a fourth control sample (EK4). Each configuration was produced by applying the two previously mentioned types of adhesives. The research findings showed that in the case of samples produced by applying CFRP (carbon fiber reinforced polymer) using epoxy adhesive, it significantly affected the increase in bending strength and flexural modulus of elasticity. The average improvement in bending strength is 32.9%, 33.2%, and 38.7%, i.e., the flexural modulus of elasticity is 54.1%, 50.7%, and 54.7%, respectively, for configurations EK1, EK2, and EK3, compared to control sample EK4. During the testing, the test samples from reinforced panels EK1 and EK2 showed partly plastic behavior up to the fracture point, while the diagram for the test samples from reinforced panels EK3 shows elastic behavior to a considerable extent, with a significantly smaller plastic behavior zone. This research proved the impossibility of using melamine-urea formaldehyde adhesive to form a composite product based on veneer and carbon fabric. The greatest contribution of this work is the experimentally verified and confirmed result of the possibility of applying poplar veneer to design structural elements in LVL using epoxy adhesive.

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“…This group also includes computer programs that provide the data needed to assess the suitability of the materials from which the product is made. [4]…”

Section: The Strength Of Plywoodmentioning

confidence: 99%

Use of the Lagrange interpolation polynomial to estimate the bending strength value of plywood

Talić,

Haurdić,

Kulenović

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In order to determine the bending strength of wood or wood-based panels, an experimental method is typically used to test samples of different sizes that involves bending or compression. However, such tests are expensive and time-consuming, so mathematical models are often applied that allow predicting the bending strength based on a smaller number of obtained test results. One such model is the Lagrange interpolation polynomial. The study discusses Lagrange’s interpolation model. Using the results of tests done on plywood of various thicknesses, approximates the bending strength of plywood for values that could not be tested directly and provides an estimate of strength for particular values.

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Method of Estimation of Laminated Wood Properties

Cited by 4 publications

References 0 publications

Dimensional and Shape Stability of Plywood Seat

Dimensional and Shape Stability of Plywood Seat

Flexural Properties in Edgewise Bending of LVL Reinforced with Woven Carbon Fibers

Use of the Lagrange interpolation polynomial to estimate the bending strength value of plywood

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