Investigation of the Mechanical Properties of Red Oak 2 by 4'S


  • David W. Green
  • Kent A. McDonald


Red oak, mechanical properties, bending, tension parallel to the grain, compression parallel to the grain, mechanical grading


Efficient 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.


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Research Contributions