Load-Carrying Efficiency of Homogeneous Wood Composites


  • Jozsef Bodig


Pseudotsuga menziesii, particleboard, fiberboard, composition board, strength, stiffness, modulus of elasticity, specific gravity, compression strength, models


Load-carrying efficiency is defined here on the basis of load-carrying capacity of a composite board per unit weight. Relationships are derived for evaluating the load-carrying efficiency for tension, compression, shear, and bending applications. As an illustration of the application of the theory, limited experimental data are provided for both particleboard and fiberboard to illustrate that optimum load-carrying efficiency does not necessarily occur at the highest density at which these composites can be manufactured. Further, it is shown that optimum load-carrying efficiency varies for different products and load types. These optimum points may not occur at the highest strength and stiffness values attainable for these products.


American Society for Testing and Materials. 1972. Standard methods of evaluating the properties of wood-base fiber and particle panel materials. Designation D-1037-72a.nBeall, F. C., W. J. Young, and A. E. Witt. 1975. Improvement of physical properties of aspen flakeboard by polymer introduction. Wood Sci. 7(3):213-218.nBrown, T. D. 1975. Modeling of strength and physical properties of structural-type particleboard. Ph.D. Dissertation, Colorado State University, Fort Collins, Colo.nBrumbaugh, J. 1960. Effect of flake dimension on properties of particleboard. For. Prod. J. 10(5):243-246.nBryan, E. 1962. Maximum strength properties of particleboard. For. Prod. J. 12(2):59-64.nGoodman, J. R., M. D. Vanderbilt, M. E. Criswell, and J. Bodig. 1974. Composite and two-way action in wood joist floor systems. Wood Sci. 7(1):25-33.nHofstrand, A. D. 1958. Relationship of specific gravity to moduli of rupture and elasticity in commercial hardboard. For. Prod. J. 8(6): 177-180.nHse, C. Y., P. Koch, C. McMillin, and E. Price. 1975. Laboratory scale development of a structural exterior flakeboard from hardwoods growing on southern pine sites. For. Prod. J. 25(4):42-50.nHunt, M. O., and S. K. Suddarth. 1974. Prediction of elastic constants of particleboard. For. Prod. J. 24(5):52-57.nJayne, B. A. (Editor.) 1972. Theory and design of wood and fiber composite materials. Syracuse University Press. Syracuse, N.Y.nLehman, W. F. 1970. Resin efficiency in particleboard as influenced by density, atomization, and resin content. For. Prod. J. 20(11):48-54.nLehman, W. F., and F. V. Hefty. 1973. Resin efficiency and dimensional stability of flakeboards. U.S. For. Prod. Lab. Res. Pap. FPL 203.nLundgren, A. 1957. Hardboard as construction material—A viscoelastic substance. Holz Roh-Werkst. 15(1):19-23.nMaloney, T. M. 1970. Resin distribution in layered particleboard. For. Prod. J. 20(1):43-52.nMcNatt, J. D. 1970. Design stresses for hardboard—effect of rate, duration and repeated loading. For. Prod. J. 20(1):53-60.nNelson, N. D. 1973. Effects of wood and pulp properties on medium density, dry-formed hardboard. For. Prod. J. 23(9):72-80.nPearson, R. G. 1977. An interim industry standard for deriving allowable unit values for structural particleboard in bending. Pages 333-350 in Proc. Eleventh Particleboard Symposium, Washington State University, Pullman, WA.nPlath, E. 1971. A contribution on particleboard mechanics. Holz Roh- Werkst. 29(10):377-382.nPlath, E., and E. Schnitzler. 1974. The density profile—A criterion for evaluating particleboard. Holz Roh- Werkst. 32(11):443-449.nPolensek, A., and G. H. Atherton. 1976. Compression-bending strength and stiffness of walls with utility grade studs. For. Prod. J. 26(11):17-25.nPost, P. W. 1961. Relation of flake size and resin content to mechanical and dimensional properties of flakeboard. For. Prod. J. 11(1):34-37.nStrickler, M. D. 1959. Effect of press cycles and moisture content on properties of Douglas-fir flakeboard. For. Prod. J. 9(7):203-215.nSuchsland, O., and G. E. Woodson. 1976. Properties of medium-density fiberboard produced in oil-heated laboratory press. Southern For. Exp. Sta. Res. Pap. SO-116.nSuperfesky, M. J., and T. J. Ramaker. 1976. Hardboard-webbed I-beams subjected to short-term loading. U.S. For. Prod. Lab. Res. Pap. FPL 264.nTalbott, J. W. 1974. Electrically aligned particleboard and fiberboard. Pages 153-182 in Proceedings of Eighth Particleboard Symposium. Washington State University, Pullman.nTalbott, J. W., and E. K. Stefanakos. 1972. Aligning forces on wood particles in an electric field. Wood Fiber 4(3):193-203.nWoodson, G. E. 1976. Effect of bark, density profile, and resin content on medium-density fiber-boards from southern hardwoods. For. Prod. J. 26(2):39-42.nWoodson, G. E. 1977. Density profile and fiber alignment in fiberboard from three southern hardwoods. For. Prod. J. 27(8):29-34.n






Research Contributions