Poisson's ratios of an oriented strand board

摘要

In the assessment of the structural adequacy of oriented strand board (OSB) members by design calculation, the need for the board's Poisson's ratios often becomes evident. However, mention of Poisson's ratios as a relevant mechanical property is seldom made in wood-based panel test and design standards. The short-term principal Poissons ratios of a typical OSB has been determined from tension tests. Mean values of 0.23 and 0.16 have been obtained for the major and minor Poisson's ratios, respectively. The experimentally determined Poisson's ratios appear consistent with the values estimated from the panel shear and tension moduli of elasticity. Complementary values of the Poisson's ratios in bending have been estimated from the bending moduli of elasticity and tension test results for the panel. Efficiency in the assessment of OSB by design calculation follows from knowledge of Poisson's ratios. However, for this benefit to be realised in routine design, the Poisson's ratios of structural grade OSB need to be available.