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Systems to dynamically measure shape changes in wooden sample sticks to determine shrinkage, twist, crook, bow, MOE and Poisson's ratio
1999 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main purpose of this thesis project was to develop measuring methods on wood. Methods for static and dynamic measuring of deformation and dimensional change in 300x20x20 mm wooden sticks were developed, where dimensions are measured with three Linear Variable Differential Transducers (LVDT´s) and deformation is measured with three Laser Displacement Sensors (LDS's). A method for measuring Modulus of Elasticity (MOE) and Poisson's ratios (v) was also developed. This method is based on a Zwick Universal Testing Machine (UTM) fitted with a custom made measuring box with six LVDT´s. A test serie was made on samples from a pinus radiata log, where weight, dimension and deformation were measured during air drying. The method to measure deformation and dimensions proved to be reliable, while the method for measuring MOE and Poisson's ratios was not as good. Interesting variations in wood deformation were found as the wood approached moisture equilibrum point.

Place, publisher, year, edition, pages
1999.
Keyword [en]
Technology, Wood, Dimension, Deformation, Shrinkage, Measuring, Twist, Crook, Bow
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-54169ISRN: LTU-EX--99/132--SELocal ID: b25acb19-9e66-4e82-beec-26ec44bcd31eOAI: oai:DiVA.org:ltu-54169DiVA: diva2:1027549
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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