Three Methods of Determining Hardness of Increment Core Segments


  • Earl H. Tryon
  • Paul J. Litwin
  • John R. Hamilton
  • John J. Renton


<i>Quercus rubra</i>, hardness tests, sanding, tool wear, sawing, machining


Three methods were devised to measure the hardness of small wood samples: a sanding test, a diamond point indentation test, and a saw blade tooth deformity test. Based on step-wise multiple regression analysis with 19 and with five important independent variables, the sanding test was best, followed by the indentation test. The saw blade test gave poor results and was discarded. The order of important independent variables among the four plots analyzed individually showed a nearly perfect relationship with the sanding test, but no consistent order of the variables among plots for the indentation test. Again this indicated that the sanding test was best.


A.S.T.M. 1965. Standard methods of testing small clear specimens of timber. Am. Soc. Test. Mater., Des. D143-52 (reapproved 1965). Philadelphia, PA.nFreudenthal, Alfred M. 1950. The inelastic behavior of engineering materials and structures. John Wiley and Sons, Inc. N.Y. (chapter 18). xvi + 587 pp.nHechtlinger, A. 1959. Modern science dictionary. Franklin Publishing Co., Inc. Palisade, New Jersey. 784 pp.nSiegel, Sidney. 1956. Nonparametric statistics for the behaviorial sciences. McGraw-Hill Book Co., Inc. New York. xvii + 312 pp.nU. S. Forest Products Laboratory. 1974. Wood handbook: wood as an engineering material. U.S.D.A. Agric. Handbook 72, rev.n






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