Some Strength Properties of Digger Pine


  • Arno P. Schniewind
  • Barry Gammon


<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


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.


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