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Assessing the bending strength and modulus of elasticity in bending of exterior foiled plywoods in relation to their construction

Author

Listed:
  • J. Hrázský

    (Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic)

  • P. Král

    (Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic)

Abstract

The paper summarizes results of an institutional research aimed at assessing the bending strength and modulus of elasticity in bending of exterior foiled combined and all-beech plywoods in relation to their construction. A relationship was studied of the plywood construction and selected physical and mechanical properties. In studied sheets, moisture, density, bending strength and modulus of elasticity were analysed along and across the grain of the upper veneer. All measurements were carried out in water-resistant plywoods with surface treatment with a phenolformaldehyde foil 8, 10, 12 and 15 mm thick in combined plywoods and 10, 12, 15 and 18 mm thick in all-beech plywoods. The construction of plywoods significantly influences their quality that is determined particularly by the bending strength and modulus of elasticity. Using regression analysis relationships were demonstrated particularly that with the increasing moisture content of plywoods the bending strength decreased and with the increasing density the bending strength and modulus of elasticity increased. The same trend was also proved in connection with the increasing number of veneers of plywood sheets. Using correlation analysis, combinations of interrelationships of the given properties were statistically tested.

Suggested Citation

  • J. Hrázský & P. Král, 2005. "Assessing the bending strength and modulus of elasticity in bending of exterior foiled plywoods in relation to their construction," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 51(2), pages 76-94.
    • Handle: RePEc:caa:jnljfs:v:51:y:2005:i:2:id:4546-jfs
    DOI: 10.17221/4546-JFS
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