The relationship between the arrangement of wood strands at the surface of OSB and the modulus of rupture determined by image analysis |
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Authors: | Takuya Nishimura M P Ansell N Ando |
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Institution: | (1) 10–171, Yawata-cho, Daihouzan, Toyokawa-shi, Aichi, 442–0857, Japan e-mail osbtak@hotmail.com Tel.: +81-533-876003 Fax: +81-3-56840299, JP;(2) Department of Materials and Science and Engineering, University of Bath, Bath, BA2 7AY, UK, GB;(3) Wood-Based Materials and Timber Engineering Laboratory, Division of Material and Housing Science, Department of Biomaterial Science, Graduate School of Agriculture and Agricultural Life Science, University of Tokyo, Bunkyo-ku yayoi 1-1-1, Tokyo, 113-8657 Japan, JP |
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Abstract: | The objective of this paper is to investigate the relationship between the arrangement of wood strands at the surface of
oriented strand board (OSB) and the modulus of rupture (MOR) determined by applying the technique of image analysis (IA).
Fiber orientation was measured manually. In addition a CCD (charge coupled device) digital camera was used to automatically
measure the fiber orientation at the surface of OSB. The total number of OSB samples evaluated was equal to 55, but variation
in density was small and the coefficient of variation was only 4%. In contrast, the variation in MOR is wide and the coefficient
of variation is 17%. Thus, the variation in density of OSB does not reflect variations in MOR. The relationship between the
MOR and the average angle of fiber orientation resulted in a weak negative correlation (r=−0.44) as might be expected, as
better axial orientation should improve MOR. The average strand area gave no correlation with MOR. Clearly, large strands
which should enhance MOR may be heavily disoriented, whereas small strands which have less influence on the MOR might be well
oriented. Hence no correlation between MOR and average strand area is observed. The prediction of MOR by using a multiple
linear regression equation including density and fiber orientation factors is only moderately successful. Hence another factor
must be identified to predict MOR accurately. The CCD camera measures fiber orientation at the OSB surface effectively.
Received 29 March 1999 |
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