Some Strength Properties of Digger Pine

Authors

  • Arno P. Schniewind
  • Barry Gammon

Keywords:

<i>Pinus sabiniana</i>, mechanical properties, static bending, compression parallel-to-grain, compression perpendicular-to-grain, shear, specific gravity, modulus of elasticity, modulus of rupture

Abstract

The mechanical properties of Digger pine (Pinus sabiniana Douglas), a species indigenous to California, were evaluated using a random mill sample of ten logs. The logs, averaging 18 inches in diameter, had a growth rate of 8.6 rings per inch and a specific gravity of 0.43, based on green volume and oven-dry weight. All tests were performed in the green condition, in accordance with ASTM D143-52. Mechanical properties were: MCS in compression parallel-to-grain, 2450 psi; shear strength, 780 psi; FSPL in compression perpendicular-to-grain, 360 psi; MOR in static bending, 5280 psi; and MOE in static bending, 1,040,000 psi. These results show that Digger pine is very similar in its mechanical properties to ponderosa pine.

References

American Society for Testing and Materials (ASTM). 1976. Standard methods of testing small clear specimens of timber, D142-52. Annual Book of Standards. ASTM, Philadelphia.nSargent, C. S. 1884. Report on the forests of North America. Dept. Interior, Census Office, Washington, D.C.nU.S. Forest Products Laboratory (USFPL). 1974. Wood Handbook. U.S. Dept. Agric., Agric. Handb. 72, rev. ed., Washington, D.C.n

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Published

2007-06-19

Issue

Number 4 / Winter 1978

Section

Research Contributions

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