FöRFATTARE
Danvind, Jonas

DATUM
1999-05-27

INSTITUTION
Institutionen i Skellefteå / Träteknik

SAMMANFATTNING
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.

ISSN 1402-1617 / ISRN LTU-EX--99/132--SE / NR 1999:132