Stress Analysis and Prediction in 3-Layer Laminated Veneer Lumber: Response to Crack and Grain Angle

Authors

  • Jae Kyung Cha
  • Ronald G. Pearson

Keywords:

Tensile strength, laminated veneer lumber, crack, sloping grain

Abstract

A mathematical model has been developed that can predict the elastic properties in tension of 3-layer laminated veneer lumber with clear, straight-grained outer layers and an inner layer with sloping grain and a crack parallel to that grain. This analysis provides a theoretical means of determining the tension behavior of the material containing a crack at any angle to the direction of the stress and takes into account the orientation and basic properties of the individual orthotropic layers.

References

Al-Dabbagh, Adam Mohammad A. 1970. Finite element stress analysis for anisotropic solids. Ph.D. thesis, Department of Civil Engineering, Colorado State University, Fort Collins, CO.nBarrett, J. D. 1976. Effect of crack-front width on fracture toughness of Douglas-fir. Eng. Fract. Mech. 8:711-717.nBarrett, J. D., and J. R. Goodman. 1973. Prediction of elastic parameters for wood. Wood Sci. 5(4):249-264.nBohlen, J. C. 1974. Tensile strength of Douglas-fir laminated veneer lumber. Forest Prod. J. 24(1):54-58.nCha, J. K. 1988. Analysis of 3-layered laminated veneer lumber with crack and cross-grain. Ph.D. thesis, Department of Wood and Paper Science, North Carolina State University, Raleigh, NC.nCramer, S. M., and J. R. Goodman. 1983. Model for strain analysis and strength prediction of lumber. Wood Fiber Sci. 15(4):338-349.nDabholkar, A. Y. 1980. Analysis of wood with knots and cross-grain. Ph.D. thesis, Department of Civil Engineering, Colorado State University, Fort Collins, CO.nGoodman, J. R., and J. Bodig. 1974. Orthotropic strength of wood in compression. Wood Sci. 4(2):83-94.nHenshell, R. D., and K. G. Shaw. 1975. Crack tip finite elements are unnecessary. Intl. J. Numer. Meth. Eng. 9:495-507.nPearson, R. G. 1974. Application of fracture mechanics to the study of tensile strength of structural lumber. Holzforschung 29(1):11-19.nPorter, A. W. 1964. On the fracture mechanics in wood. Forest Prod. J. 14(8):325-331.nSchniewind, A. P., and D. E. Lyon. 1971. Tensile strength of redwood dimension lumber. I. Relation to grade and working stress. Forest Prod. J. 21(7): 18-27.nSchniewind, A. P., and D. E. Lyon. 1973. A fracture mechanics approach to the tensile strength perpendicular to grain of dimension lumber. Wood Sci. Technol. 7:45-59.nSchniewind, A. P., and R. A. Pozniak. 1971. On the fracture toughness of Douglas-fir wood. Eng. Fract. Mech. 2:223-233.nUSDA Forest Products Laboratory. 1987. Wood handbook, 2nd ed. U.S. Govt. Printing Office, Washington, DC.n

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Published

2007-06-22

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Section

Research Contributions