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Development of a classification system for Sri Lankan timber species based on physical properties

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dc.contributor.advisor Sivahar V Madhuwanthi MAR 2019 2019 2019
dc.identifier.citation Madhuwanthi, M.A.R. (2019). Development of a classification system for Sri Lankan timber species based on physical properties [Master’s theses, University of Moratuwa]. Institutional Repository University of Moratuwa.
dc.description.abstract An investigation was carried out on selected twenty five Sri Lankan timber species to study different wood properties which are commonly applied in the timber industry in Sri Lanka. Wood density, modulus of rupture, modulus of elasticity, compression strength at rupture and compression in elastic limit at direction of parallel to grain were tested by five samples of each specimen at moisture content between 12% - 15%. The obtained results were analysed to find correlation among properties and to develop a classification based on the wood properties. BS 373:1957 (1999) standard was followed to test small clear samples in sample sizing, testing and calculation procedures. Three point bending test, compression parallel to grain test were applied to investigate mechanical properties and by measuring weight and volume at 12%-15% moisture content, density was calculated. Obtained results described a fair correlation among density and mechanical properties specially, modulus of rupture and modulus of elasticity. These results can be used to predict the mechanical properties with respect to density and vice versa. Above properties were referred to develop the classification into four basic grades as super grade, high grade, medium grade and low grade. Further any relationship could not be found between the timber classification published by State Timber Corporation and it proved that this classification is not based on the wood properties. It is recommended to extent the research by increasing types of properties, number of species and samples with various age limits and growing conditions and height of the trees. This could be benefitted to improve the effectiveness of the classification based on properties and to develop standards of the timber industry in Sri Lanka. en_US
dc.language.iso en en_US
dc.subject MATERIALS SCIENCE-Dissertations en_US
dc.subject TIMBER INDUSTRY-Sri Lanka en_US
dc.subject WOOD-Classification en_US
dc.subject WOOD-Properties en_US
dc.title Development of a classification system for Sri Lankan timber species based on physical properties en_US
dc.type Thesis-Full-text en_US
dc.identifier.faculty Engineering en_US MSc in Materials Science & Engineering en_US
dc.identifier.department Department of Materials Science & Engineering en_US 2019
dc.identifier.accno TH3805 en_US

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