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Article

Effect of Selected Factors on the Bending Deflection at the Limit of Proportionality and at the Modulus of Rupture in Laminated Veneer Lumber

Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Kamýcká 1176, Prague–Suchdol 16521, Czech Republic
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Forests 2019, 10(5), 401; https://doi.org/10.3390/f10050401
Received: 18 March 2019 / Revised: 4 May 2019 / Accepted: 5 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Wood Properties and Processing)
The deflection of a test material occurs under bending stress that is caused by force. In terms of plasticity and elasticity, the deflection can be quantified at two main areas, which are the limit of proportionality and the modulus of rupture. Both of these deflections are of great importance in terms of the scientific and practical use. These characteristics are particularly important when designing structural elements that are exposed to bending stress in terms of the size of the deflection in their practical application. This study analyzed the effect on the size of the deflection at the limit of proportionality and at the modulus of rupture. Wood species (Fagus sylvatica L. and Populus tremula L.), material thickness (6 mm, 10 mm, and 18 mm), non-wood component (glass and carbon fiber), position of the non-wood component in the layered material (up and down side with respect to the loading direction), and adhesive used to join the individual layers (polyurethane and polyvinyl acetate) were the observed factors. Glass fiber reinforcement proved to be a better option; however, the effect of correctly selected glue for individual wood species was also apparent. For the aspen laminated materials, polyurethane adhesive (PUR) adhesive was shown to be a more effective adhesive and PVAc adhesive was better for the beech-laminated materials. These results are of great importance for the production of new wood-based materials and materials were based on non-wood components, with specific properties for their intended use. View Full-Text
Keywords: technological and product innovations; cyclic loading; laminated wood; deflection at the limit of proportionality; deflection at the modulus of rupture; wood-processing industry performance technological and product innovations; cyclic loading; laminated wood; deflection at the limit of proportionality; deflection at the modulus of rupture; wood-processing industry performance
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MDPI and ACS Style

Sikora, A.; Svoboda, T.; Záborský, V.; Gaffová, Z. Effect of Selected Factors on the Bending Deflection at the Limit of Proportionality and at the Modulus of Rupture in Laminated Veneer Lumber. Forests 2019, 10, 401. https://doi.org/10.3390/f10050401

AMA Style

Sikora A, Svoboda T, Záborský V, Gaffová Z. Effect of Selected Factors on the Bending Deflection at the Limit of Proportionality and at the Modulus of Rupture in Laminated Veneer Lumber. Forests. 2019; 10(5):401. https://doi.org/10.3390/f10050401

Chicago/Turabian Style

Sikora, Adam, Tomáš Svoboda, Vladimír Záborský, and Zuzana Gaffová. 2019. "Effect of Selected Factors on the Bending Deflection at the Limit of Proportionality and at the Modulus of Rupture in Laminated Veneer Lumber" Forests 10, no. 5: 401. https://doi.org/10.3390/f10050401

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