Deflection of Multilayer-Sandwich Beams with Application to Plywood Panels

Authors

  • R. O. Foschi

Keywords:

sandwich plates, plywood, finite elements, concrete forms, structural engineering

Abstract

The deflection of multilayer-sandwich beams (or plates with a dominant dimension in plan) when all layers are weak in shear is studied with a finite-element approach. The theory is applied to the deflection of plywood when soaked (moisture content more than 30%), and a particular case of five-ply plywood is studied in detail. The numerical results are shown to converge rapidly with increasing number of elements and the theoretical predictions are verified by experimental measurements. It is shown that the influence of shear deformations on the deflection of plywood, when soaked, is important and should be taken into account in design specifications.

References

Azar, J. J. 1968. Bending theory for multilayer orthotropic sandwich plates. AIAA J. 6(11): 2166-2169.nChiu, Y. M., and E. Biblis. 1971. An analysis of flexural rigidity of 7-ply southern pine plywood strips at short spans parallel to face grain. Wood Fiber 3(2): 112-120.nKhatua, T. P., and Y. K. Cheung. 1972. Triangular element for multilayer sandwich plates. J. Eng. Mech. Div. ASCE 98(EM5): 1225-1238.nKollmann, F. F. P., and W. A. Côté. 1968. Principles of wood science and technology, v. I. Springer-Verlag, N.Y., pp. 294 and 309.nPlantema, F. J. 1966. Sandwich construction. John Wiley, New York.nU.S. Forest Service. 1955. Wood handbook. U.S. Dep. Agr. Handbook No. 72, Washington, D.C. p. 79.nZienkiewicz, O. C. 1971. The finite element method in engineering science. McGraw-Hill, London.n

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Published

2007-06-05

Issue

Number 3 / Fall 1973

Section

Research Contributions

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