Coefficient of wood bendability as a function of selected factors

Gaff, Milan; Vokatý, Vojtěch; Babiak, Marián; Bal, Bekir Cihad

doi:10.1016/j.conbuildmat.2016.09.085

Cited by 16 publications

(28 citation statements)

References 8 publications

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“…Increasing the number of loading cycles increased the values of the ratio of deformation Y E : Y MOR (increase of 7%) compared to samples that were not subjected to cyclic loading. These results correspond with the article by Gaff et al (2016), which reports that cyclic loading resulted in the development of plastic and viscoelastic deformations. For this reason, the plastic deformations during a bending test after cyclic loading were smaller, i.e.…”

Section: Deflection At the Limit Of Proportionality And At The Point supporting

confidence: 77%

“…In addition to commercial formaldehyde adhesives used in the manufacture of laminated wood, the application of environmentally friendly adhesives such as polyvinyl acetate and polyurethane adhesives is becoming more widespread. Their greatest advantage over formaldehyde-based adhesives is the fact that they aren't toxic (Kim and Kim 2006;Gaff et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Identifying the Characteristics of Laminated Wood Based on the Values of Deflection Measured during its Bending

et al. 2017

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This article is aimed at verifying the influence of selected factors (wood species, lamella combination, type of adhesive, number of loading cycles) on the deflection at the proportionality limit Y E , deflection at the point of rupture Y MOR , and the ratio between the deflection at the proportionality limit and the deflection at the point of rupture Y E :Y MOR . All of the monitored characteristics were evaluated on test specimens made from lamellas of beechwood (Fagus sylvatica L.) and aspen wood (Populus tremula L.). The laminated wood consisted of a combination of lamellas that were nondensified and densified to 10% and 20% of their original thickness. Two types of adhesives were used for the research: polyvinyl acetate (PVA) glue and polyurethane (PUR) glue. The results create a database of information that can be used in developing materials with specified properties for its intended use.

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Section: Deflection At the Limit Of Proportionality And At The Point supporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Identifying the Characteristics of Laminated Wood Based on the Values of Deflection Measured during its Bending

et al. 2017

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“…Densification of wood reduces the porosity and moisture content of the wood [16]. Gaff et al [17] examined the effect of densification on bond strength. They found that the effect of the densification on bond strength is statistically very significant.…”

Section: Introductionmentioning

confidence: 99%

Laminated Veneer Lumber with Non-Wood Components and the Effects of Selected Factors on Its Bendability

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Záborský

et al. 2019

Forests

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Knowledge of the coefficients of wood bendability (KbendC and KbendB) and of the effects of selected factors on the listed characteristics in bending stress has both scientific and practical significance. It forms a foundation for designing tools for bending and determines the stress that products and their parts can be exposed to during use. This study analyzes the effects of selected factors on the selected characteristics, such as the coefficients of wood bendability (KbendC and KbendB). The selected factors of this study were wood species (WS) (Fagus sylvatica L. and Populus tremula L.), non-wood component (carbon fiber and glass fiber), position of the non-wood component in the laminated material (top and bottom), material thickness (T) (6 mm, 10 mm, and 18 mm), and adhesive (polyvinyl acetate and polyurethane), as well as their combined interaction on the monitored characteristics described above. The results contribute to the advancement of knowledge necessary for the study and development of new materials with specific properties for their intended use. The measured values of laminated structures can be compared with the values measured on the samples from the wood. The results can improve the innovative potential of wood processing companies and increase their performance and competitiveness in the market.

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“…All materials deform via the effect of forces, whether they are a result of applied external stress, internal thermal, or internal moisture stress (Bodig and Jayne 1982;Wiemann 2010;Gaff et al 2015aGaff et al , 2016Gaff et al , 2017.…”

Section: Introductionmentioning

confidence: 99%

“…During bending, the wood is forced to deform in a preselected direction, i.e. the character of the deformation will be forced (Wagenführ 2000;Blomberg et al 2005;Gaff et al 2015aGaff et al , 2016Gaff et al , 2017Ružiak et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Bending Forces at the Proportionality Limit and the Maximum – Technological Innovations for Better Performance in Wood Processing Companies

et al. 2017

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Knowledge of the force required to overcome deformation at the proportionality limit, maximum limit, and their ratio, as well as knowledge of the effect of selected factors on the listed characteristics in bending stress, have both scientific and practical significance. They form a foundation for designing tools for bending and determine the stress that products and their parts can be exposed to during use. This study analyzes the effect of selected factors on the force at the proportionality limit (FE), the force at the maximum limit (FP), and the ratio of these two characteristics (FE/FP). This study examined the effect of the wood species (WS) (Fagus sylvatica L. and Populus tremula L.), material thickness (MT) (4 mm, 6 mm, 10 mm, and 18 mm), degree of densification (DOD) (0%, 10%, and 20%), and the number of cycles (NOC) (0 or 10,000), as well as their combined interaction, on the monitored characteristics. The results contribute to the advancement of knowledge necessary for the study and development of new materials with specific properties for their intended use. The results can improve the innovative potential of wood processing companies and increase their performance and competitiveness in the market.

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Coefficient of wood bendability as a function of selected factors

Cited by 16 publications

References 8 publications

Identifying the Characteristics of Laminated Wood Based on the Values of Deflection Measured during its Bending

Identifying the Characteristics of Laminated Wood Based on the Values of Deflection Measured during its Bending

Laminated Veneer Lumber with Non-Wood Components and the Effects of Selected Factors on Its Bendability

Bending Forces at the Proportionality Limit and the Maximum – Technological Innovations for Better Performance in Wood Processing Companies

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