Structural Properties of Oriented Wood Strand Composite: Effect of Strand Orientation and Modeling Prediction
Publication: Journal of Engineering Mechanics
Volume 135, Issue 11
Abstract
This paper first examined the effect of wood strand orientation on the flexural properties of oriented wood strand composites (OSB) under different engineering stress modes, and second, investigated the applicability of the rule of mixtures in conjunction with the theory of elasticity for predicting the properties of OSB. The results showed that the performance of OSB was closely related to the loading directions and stress modes: The flexural strength and stiffness under both flat and edgewise bending loads consistently decreased with increasing angles between the applied load and longitudinal direction of orientation of strands, but that under flat bending being much more significant. Panel shear at 45° loading angle resulted in higher strength compared to other loading angles tested, indicating an occurrence of diagonal shear stresses. In conjunction with the numerical results from image analysis of the structure of OSB, and the oriented elasticity and stress algorithms, the models for theoretically predicting the strength and stiffness of OSB under various loading angles were derived with a good estimate under bending and panel shear loads, implying that OSB can be treated as a composite and its properties may be modeled by the rule of mixtures by suitable development, even though OSB has a very high volume fraction of wood strands (0.979) and correspondingly very low volume fraction of resin (0.021).
Get full access to this article
View all available purchase options and get full access to this article.
References
Bazan, I. M. M. (1980). “Ultimate bending strength of timber beams.” Ph.D. dissertation, Civil Engineering, Nova Scotia Technical College, Halifax, Nova Scotia, Canada.
Bodig, J., and Jayne, B. A. (1982). Mechanics of wood and wood composites, Van Nostrand Reinhold, New York.
Broutman, L. J., and Krock, R. H. (1967). Modern composite materials, Addison-Wesley, Reading, Mass.
Conners, T. E. (1985). “The effect of moisture gradients on the stiffness and strength of yellow-poplar.” Ph.D. dissertation, Forestry and Forest Products, Virginia Polytechnic Institute and State Univ., Blacksburg, Va.
Cox, H. L. (1952). “The elasticity and strength of paper and other fibrous materials.” Br. J. Appl. Phys., 3, 72–79.
Dietz, A. G. H. (1942). “Stress-strain relations in timber beams (Douglas fir).” ASTM Bull., 118, 19–27.
Dinwoodie, J. M. (2000). Timber—Its nature and behaviour, E & FN Spon, London.
Fan, M. Z., Bondfield, P. W., and Dinwoodie, J. M. (2006b). “Nature and behaviour of cement bonded particleboard: Structure, physical property and movement.” J. Mater. Sci., 41(17), 5666–5678.
Fan, M. Z., Bondfield, P. W., Donwoodie, J. M., and Breese, M. C. (2000). “Dimensional instability of cement bonded particleboard: SEM and image analysis.” J. Mater. Sci., 35, 6213–6220.
Fan, M. Z., Bondfield, P. W., Donwoodie, J. M., and Enjily, V. (2006a). “Effect of test pieces size on rheological behaviour of wood composites.” J. Eng. Mech., 132(8), 815–822.
Fan, M. Z., Dinwoodie, J. M., Bonfield, P. W., and Breese, M. C. (2004). “Dimensional instability of cement bonded particleboard: Modelling CBPB as a composite of two materials.” Wood Sci. Technol., 37, 373–383.
Gerhards, C. C. (1982). “Effect of moisture content and temperature on the mechanical properties of wood: An analysis of immediate effects.” Wood Fiber, 14(1), 4–36.
Hull, D. (1981). An introduction to composite materials, Cambridge University Press, Cambridge.
Kelly, A., and Tyson, W. R. (1965). “Fibre reinforced composite.” J. Mech. Phys. Solids, 13, 329–334.
Kollmann, F. P., and Cote, W. A. (1968). Principles of wood science and technology. I: Solid wood, Springer, Berlin.
Koponen, S., Toratti, T., and Kanerva, P. (1989). “Modelling longitudinal elastic and shrinkage properties of wood.” Wood Sci. Technol., 23, 55–63.
Nathan, G. K. (1977). “Ensile behaviour of fibre reinforced cement paste.” J. Ferrocement, 7(2), 59–93.
Ortiz, M. (1985). “A constitutive theory for the inelasticity behaviour of concrete.” Mech. Mater., 4, 67–93.
Pakotiprapha, B. (1974). “Mechanical properties of cement mortar with randomly orientated short steel wires.” J. Constr. Res., 26(86), 3–15.
Sliker, A. (1973). “Young's modulus parallel to the grain in wood as a function of strain rate, stress level and mode of loading.” Wood Fiber, 4(4), 325–333.
Wake, W. C. (1982). Adhesion and the formulation of adhesives, 2nd Ed., Applied Science Publishers, New York.
Information & Authors
Information
Published In
Copyright
© 2009 ASCE.
History
Received: Jul 30, 2007
Accepted: Jun 17, 2009
Published online: Oct 15, 2009
Published in print: Nov 2009
Notes
Note. Associate Editor: Dinesh R. Katti
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.