American Coast Douglas Fir Wood

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American Coast Douglas Fir Wood
Categories:	Wood and Natural Products; Wood; Softwood
Material Notes:	Softwood with resin canals. Least easy to work with hand tools. Data is based on small, clear, air-dried samples unless specified. Property values marked by an asterisk (*) have been taken from an unusually old reference source.
Key Words:	Pseudotsuga menziesii; Lumber, Timber
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Physical Properties	Original Value	Comments

Density	0.280 - 0.340 g/cc	Earlywood
	0.450 g/cc	Oven Dry Weight/Unseasoned Volume
	0.740 - 0.840 g/cc	Latewood
	38.0 lb/ft³	Unseasoned*
Moisture Absorption at Equilibrium	2.0 - 8.0 %	Between 40% RH and 90% RH
Cell Length	4.20 mm	Mature Wood

Mechanical Properties	Original Value	Comments
Hardness, Wood Indentation	2100 N	Side. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	2300 N	End. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	3200 N	Side
Tensile Strength, Ultimate	2.30 MPa	Perpendicular to Grain
	130 MPa	Axial
	200 psi	Perpendicular to Grain*
Modulus of Rupture	0.0840 GPa	In Bending
	7.80 ksi	Static Bending*
Flexural Yield Strength	55.8 MPa	Bending stress at proportional limit
	5000 psi	Fiber Stress at Elastic Limit; Static Bending*
Flexural Modulus	13.66 - 13.8 GPa	In Bending
	1580 ksi	Static Bending*
Compressive Strength	6.00 MPa	Perpendicular to Grain
	49.0 - 51.0 MPa	Parallel to Grain
	530 psi	Perpendicular to Grain*
	3400 psi	Parallel to Grain*
	3940 psi	Max Crushing Strength Parallel to Grain*
Poissons Ratio	0.029	µ_TL, 12% Moisture Content
	0.036	µ_RL, 12% Moisture Content
	0.292	µ_LR, 12% Moisture Content
	0.374	µ_TR, 12% Moisture Content
	0.39	µ_RT, 12% Moisture Content
	0.449	µ_LT, 12% Moisture Content
Shear Strength	8.20 MPa	Orientation Unknown
	910 psi	Parallel to Grain*
Impact	2.9	in-lb/in³; Work to Elastic Limit; Unseasoned Sample; Impact Bending*
	9400	psi; Fiber Stress at Elastic Limit; Unseasoned Sample; Impact Bending*
Work to Elastic Limit	0.860 in-lb/in³	Static Bending*
Work to Maximum Load	6.70 in-lb/in³	Static Bending*
Toughness	22.6 J	Radial
	40.8 J	Tangential
Cleavage	22.0 kN/m	Tangential surface of failure, Unseasoned*
	24.0 kN/m	Radial surface of failure, Unseasoned*

Thermal Properties	Original Value	Comments
CTE, linear	3.70 µm/m-°C @Temperature 20.0 °C	Axial. Typical value for Fir.
	15.8 µm/m-°C @Temperature 20.0 °C	Radial; Typical value for Fir.
	58.4 µm/m-°C @Temperature 20.0 °C	Tangential. Typical value for Fir.
Thermal Conductivity	0.120 W/m-K
Shrinkage	5.0 %	Radial; Green to Zero Moisture
	7.8 %	Tangential; Green to Zero Moisture
	11.8 %	Volumetric; Green to Zero Moisture

References for this datasheet.

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