Summary
The within member variation of tensile strength parallel to grain in nominal 38×89 mm No. 2 Spruce-Pine-Fir lumber has been experimentally evaluated. Window analyses yielded the within member tensile strength cumulative probability distributions of lumber segments with various lengths. Semivariogram and regression analyses have been performed to characterize the spatial correlation of the tensile strength of lumber. The results indicate that the tensile strength values within a piece of lumber separated by a distance greater than 1.83 m can be considered statistically independent.
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References
David, M. 1977: Geostatistical ore reserve estimation. New York: Elsevier Scientific Publishing Co.
Journal, A.; Huijbregts, C. 1978: Mining geostatistics. New York: Academic Press
Lam, F. 1987a: Effect of length on the tensile strength of lumber. Report to the Canadian Wood Council LPSC. Vancouver, B. C.: Forintek Canada Corp.
Lam, F. 1987b: Summary testing procedures report for lumber properties In-grade testing program. Report to the Canadian Wood Council LPSC. Vancouver, B. C.: Forintek Canada Corp.
Lawless, J. F. 1982: Statistical models and methods for lifetime data. New York: Wiley
Leicester, R. H. 1988: Rogue factors in proof grading. Proceedings 1988 International Conference on Timber Engineering, Seattle, Wa. 1:345–350
Madsen, B.; Buchanan, A. H. 1886: Size effect in timber by a modified weakest link theory. Can. J. Civ. Eng. 13:218–232
Showalter, K. L.; Woeste, F. E.; Bendtsen, B. A. 1987: Effect of length on the tensile strength of lumber. Res. Pap. FPL-RP-482. Madison, WI: U.S.D.A. For. Prod. Lab.
Woeste, F. E.; Green, D. W.; Tarbell, K. A.; Marin, L. A. 1987: Proof loading to assure lumber strength. Wood Fiber Sci. 19:283–297
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The Authors gratefully acknowledge the support of the Forestry Canada and the technical assistance of Mr. H. Sue, Mr. B. Deacon and Dr. J. Cook for this study. The research was performed while the principal author was working at Forintek Canada Corp.
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Lam, F., Varoglu, E. Variation of tensile strength along the length of lumber. Wood Sci.Technol. 25, 351–359 (1991). https://doi.org/10.1007/BF00226174
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DOI: https://doi.org/10.1007/BF00226174