Investigation of relationship between dynamic modulus of elasticity and static bending ‎properties in ‎particleboard plates

Hemmasi, Amir Homan; Kohantorabi, Mostafa

doi:10.22092/ijwpr.2017.109577

Document Type : Research Paper

Authors

¹ Department of Wood and Paper Science and Technology College of Agriculture and Natural Resources, Science and Research ‎Branch, Islamic Azad University, Tehran, Iran

² Ph.D Student, Department of Wood and Paper Science Islamic Azad University, Science and Research Branch, Hesarak, Poonak, Tehran

https://doi.org/10.22092/ijwpr.2017.109577

Abstract

In this study the relationship between dynamic modulus of elasticity from longitudinal ‎vibration ‎method with static modulus of elasticity and bending strength in two directions: the ‎Parallel ‎machine direction and machine direction have been investigated. For this purpose 4 ‎plates of ‎particleboard with dimensions 124× 90 ×1.6 cm (length× width× thickness) were ‎selected and free ‎longitudinal vibration test in PMD and MD were performed on each plates. ‎After that the primary ‎plates were cut to four plates with dimensions 62× 44 ×1.6 cm (length× ‎width× thickness) and ‎longitudinal vibration test in PMD and MD were performed on each ‎plates again. Finally each plates ‎were cut to the beams with dimensions 36× 1.6 ×1.6 cm and ‎longitudinal vibration test and and ‎static bending test were performed on them. The results show ‎that good correlation between ‎dynamic modulus of elasticity from longitudinal vibration test ‎and static modulus of elasticity and ‎bending strength (result of beams extracted from each ‎plates) in both size of plates in two size ‎‎(124× 90 ×1.6 and 62× 44 ×1.6 cm) and beams ‎extracted from each plates in two directions (PMD ‎and MD). In addition there was good ‎correlation between dynamic modulus of elasticity of ‎longitudinal vibration from two size plates ‎‎(124× 90 ×1.6 and 62× 44 ×1.6 cm). When the samples ‎smaller than primary plates, the ‎dynamic modulus of elasticity values were increased, that it due to ‎the diffusion of waves in ‎samples with larger dimensions. In general, according to results of this ‎research it can be ‎concluded that by applying the appropriate correction factors, longitudinal ‎vibration method an ‎efficiency method for calculation of dynamic and static modulus of elasticity ‎and estimate of ‎the modulus of rupture in plates in full sized.‎

Keywords

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Investigation of relationship between dynamic modulus of elasticity and static bending ‎properties in ‎particleboard plates

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Volume 32, Issue 2 - Serial Number 59July 2017Pages 193-204

Volume 32, Issue 2 - Serial Number 59
July 2017
Pages 193-204