Comparison of Several Nondestructive Evaluation Techniques for Assessing Stiffness and MOE of Small Diameter Logs
Robert J. Ross, Xiping Wang, James A. Mattson, John R. Erickson, John W. Forsman, Earl A. Geske
ABSTRACT
A variety of nondestructive evaluation (NDE) techniques are used to assess the engineering properties of structural lumber. Static bending, transverse-vibration, and longitudinal stress wave NDE techniques are frequently used to assess the modulus of elasticity (MOE) of lumber. Excellent correlations between MOE values obtained from these techniques have been shown to exist. The objective of this research was to investigate use of these techniques to evaluate the flexural stiffness and MOE of small diameter logs. A sample of red and jack pine logs were obtained from Upper Peninsula, Michigan for this study. All logs were assessed at the laboratory using static bending, transverse vibration, and longitudinal stress wave techniques. Statistical comparisons between stiffness and MOE values obtained from each technique were examined. Exceptionally strong correlative relationships were found to exist for most comparisons.
Publication Source: Proceedings of the 12th International Symposium on Nondestructive Testing of Wood University of Western Hungary, Sopron, 13-15 September 2000, ISBN 963 7180 88 5 Publisher: University of Western Hungary, H 9400 Sopron, P.O.Box 132, FAX: +36 99 311 103
