Skip header and navigation

3 records – page 1 of 1.

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

https://research.thinkwood.com/en/permalink/catalogue2482
Year of Publication
2019
Topic
Mechanical Properties
Connections
Material
LVL (Laminated Veneer Lumber)
Author
Sikora, Adam
Svoboda, Tomáš
Záborský, Vladimír
Gaffová, Zuzana
Organization
Czech University of Life Sciences in Prague
Publisher
MDPI
Year of Publication
2019
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Topic
Mechanical Properties
Connections
Keywords
Bending Deflection
Modulus of Rupture
Limit of Proportionality
Research Status
Complete
Series
Forests
Summary
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.
Online Access
Free
Resource Link
Less detail

Impact of Selected Factors on the Bending Forces at the Proportionality Limit and Yield Point in Laminated Veneer Lumber

https://research.thinkwood.com/en/permalink/catalogue2488
Year of Publication
2019
Topic
Mechanical Properties
Design and Systems
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Author
Svoboda, Tomáš
Sikora, Adam
Záborský, Vladimír
Gaffová, Zuzana
Organization
Czech University of Life Sciences in Prague
Publisher
North Carolina State University
Year of Publication
2019
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Topic
Mechanical Properties
Design and Systems
Keywords
Product Innovations
Force at the Proportionality Limit
Force at the Maximum Limit
Research Status
Complete
Series
BioResources
Summary
Knowledge of the force required to overcome deformation at the proportionality limit, yield point, as well as knowledge of the effect of selected factors on the characteristics during bending stress, have scientific and practical significance. They are the basis for designing tools for bending and accurately determining the stresses to which products and their parts may be subjected during use. This study analyzed the effect of selected factors on the selected characteristics, including the forces at the proportionality limit (FE) and yield point (FP). The chosen factors of this study were the wood species (Fagus sylvatica L. and Populus tremula L.), non-wood component (carbon and fiberglass), non-wood component position in the composition matrix (up and down), material thickness (6 mm, 10 mm, and 18 mm), and adhesive used (polyvinyl acetate and polyurethane), as well as their combined interaction. The results contributed to the advancement of knowledge necessary for the study and development of new materials with specific properties for their intended use. The results could improve the innovative potential of wood processing companies and increase their performance and competitiveness in the market.
Online Access
Free
Resource Link
Less detail

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

https://research.thinkwood.com/en/permalink/catalogue2481
Year of Publication
2019
Topic
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Author
Svoboda, Tomáš
Sikora, Adam
Záborský, Vladimír
Gaffová, Zuzana
Organization
Czech University of Life Sciences in Prague
Publisher
MDPI
Year of Publication
2019
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Topic
Mechanical Properties
Keywords
Bendability
Bending Stress
Research Status
Complete
Series
Forests
Summary
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.
Online Access
Free
Resource Link
Less detail