Investigation of the Mechanical Properties of Red Oak 2 by 4'S
Keywords:Red oak, mechanical properties, bending, tension parallel to the grain, compression parallel to the grain, mechanical grading
AbstractEfficient utilization of the U.S. hardwood supply depends upon developing better methods of grading lumber and assigning allowable property values to structural lumber produced from hardwood species. This study evaluated the properties of lumber cut from logs of the northern red oak species group and tested in bending, and in tension and compression parallel to the grain. Compared to published values derived by ASTM D245 clear-wood procedures, the results of this study indicate that significant increases in allowable properties could be obtained using procedures based on tests of full-size lumber given in ASTM D1990. The relationships between hardwood lumber strength in compression parallel to the grain and bending strength and between tension parallel to the grain and bending strength were found to be similar to those for softwood species. Thus, procedures used to assign properties to machine-graded softwood species should be applicable to northern red oak.
ASTM. 1991. American Society for Testing and Materials, annual book of standards, vol. 04.08, Wood. Philadelphia, PA.nASTM. 1991. Standard test methods of static tests of timbers in structural sizes. ASTM D198.nASTM. 1991. Standard methods for establishing structural grades and related allowable properties for visually graded lumber. ASTM D245.nASTM. 1991. Standard methods for establishing clear wood strength values. ASTM D2555.nASTM. 1991. Standard test methods for mechanical properties of lumber and wood based structural material. ASTM D4761.nASTM. 1991. Standard practice for establishing allowable properties for visually graded dimension lumber from in-grade tests of full size specimens. ASTM D1990.nBendtsen, B. A., and R. L. Youngs. 1981. Machine stress rating of wood: An overview. Pages 21-34 in Proceedings of XVII IUFRO World Congress, Division 5, September 8, 1981, Kyoto, Japan.nDeBonis, A. L., and L., A. Bendtsen. 1988. Design stresses for hardwood structural grades create new opportunities. Pages 48-50 in Executive Summaries, 43rd annual meeting. Forest Products Research Society, 25-29 June, 1988, Reno, NV. Forest Products Research Society, Madison, WI.nDoyle, D. V., and L. J. Markwardt. 1966. Properties of southern pine in relation to strength grading of dimension lumber. Res. Pap. FPL-64. USDA Forest Service, Forest Products Laboratory, Madison, WI.nDoyle, D. V., and L. J. Markwardt. 1967. Tension parallel-to-grain properties of southern pine dimension lumber. Res. Pap. FPL-84. USDA Forest Service, Forest Products Laboratory, Madison, WI.nGalligan, W. L., D. Snodgrass, and G. Crow. 1978. Machine stress rated lumber: Practical concerns and theoretical restraints. Gen. Tech. Rep. FPL-7. USDA Forest Service, Forest Products Laboratory, Madison, WI.nGreen, D. W., and J. W. Evans. 1987. Mechanical properties of visually graded lumber, vol. 1, A summary. Publication PB-88-159-389. USDA National Technical Information Service, Springfield, VA.nGreen, D. W., and D. E. Kretschmann. 1991. Lumber property relationships for use in engineering design codes. Wood Fiber Sci. 23(3):436-456.nGreen, D. W., B. E. Shelley, and H. P. Vokey. 1989. In-grade testing of structural lumber. Proceedings 47363. April 1988, Forest Products Research Society, Madison, WI.nMcDonald, K. A., and J. W. Whipple. 1992. Yield of 2 by 4 red oak stress-graded dimension lumber from factory-grade logs. Forest Prod. J. 42(6):5-10.nNELMA. 1992. Standard grading rules for northeastern lumber. Northeastern Lumber Manufacturer's Association, Cumberland, ME.nNFPA. 1991. Design values for wood construction: A supplement to the national design specifications. National Forest Products Association, Washington, DC.n
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