Influence of Vertical Density Distribution on Bending Modulus of Elasticity of Wood Composite Panels: A Theoretical Consideration

Authors

  • Wei Xu

Keywords:

Density, laminate theory, modulus of elasticity, wood composite panels, vertical density distribution

Abstract

Vertical density distribution (VDD) has long been recognized as an important structural characteristic of wood composite panels. However, only a qualitative understanding of its influence on board properties has been achieved. This paper reports a theoretical consideration of the influence of VDD on bending modulus of elasticity (MOE) of composites. The consideration was based on the construction of VDD with a trigonometric function, linear layer MOE—layer density relationship, and laminate theory. Theoretical consideration shows that MOE benefits from the high density surface layer and increases linearly with the increase of peak density, but maximum MOE does not occur when peak density is right at the board surface.

References

Bodig, J., and B. Jayne. 1982. Mechanics of wood and wood composites. Van Nostrand Reinhold Co., New York, NY. 712 pp.nKelly, M. W. 1977. Critical literature review of relationship between processing parameters and physical properties of particleboard. Gen. Tech. Rep. FPL-20. USDA Forest Serv., Forest Prod. Lab., Madison, WI.nSuchsland, O., and G. Woooson. 1976. Properties of medium density fiberboard produced in an oil-heated laboratory press. Forest Service Research Paper SO-116. USDA Forest Serv., Southern Forest Exp. Sta., Pincville, LA.nXu, W., and P. M. Winistorfer. 1996. Fitting an equation to vertical density profile data using Fourier analysis. Holz Roh- Werkst. 54(1):57-59.nXu, W., and O. Suchsland. 1998. Modulus of elasticity of wood composite panels with a uniform vertical density profile: A model. Wood Fiber Sci. 30(3):293-300.n

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Published

2007-06-25

Issue

Number 3 / July 1999

Section

Research Contributions

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