Wood Properties: Douglas-fir, Interior South
Wood mechanical, physical, and thermal properties for 190+ hardwood and softwood species at green and 12% moisture content — including strength, stiffness, hardness, shrinkage, thermal conductivity, Poisson ratios, and elastic ratios from the USDA Wood Handbook
| species name | moisture content | category | compression parallel kPa (kPa) | compression perpendicular kPa (kPa) | elastic ratio ER EL (dimensionless) | elastic ratio ET EL (dimensionless) | elastic ratio GLR EL (dimensionless) | elastic ratio GLT EL (dimensionless) | elastic ratio GRT EL (dimensionless) | impact bending mm (mm) | modulus of elasticity MPa (MPa) | modulus of rupture kPa (kPa) | origin | poisson LR (dimensionless) | poisson LT (dimensionless) | poisson RL (dimensionless) | poisson RT (dimensionless) | poisson TL (dimensionless) | poisson TR (dimensionless) | shear parallel kPa (kPa) | side hardness N (N) | specific gravity (dimensionless) | tension perpendicular kPa (kPa) | work to max load kJ m3 (kJ/m3) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Douglas-fir, Interior South | 12% | Softwood | 43,000 | 5,100 | 0.068 | 0.05 | 0.064 | 0.078 | 0.007 | 510 | 10,300 | 82,000 | Domestic | 0.292 | 0.449 | 0.036 | 0.39 | 0.029 | 0.374 | 10,400 | 2,300 | 0.46 | 2,300 | 62 |
| Douglas-fir, Interior South | Green | Softwood | 21,400 | 2,300 | — | — | — | — | — | 380 | 8,000 | 47,000 | Domestic | — | — | — | — | — | — | 6,600 | 1,600 | 0.43 | 1,700 | 55 |
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