CIVL439/WO0D476 Compression Parallel to Grain 0010.02 Tensile Strengths tle fail Tensle Shear Strengths 12 CIVL439/WOOD476 12 Compression Parallel to Grain 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 0 0.5 1 1.5 2 2.5 Displacement (in) Load (lb) Compression Perpendicular to Grain 15 20 25 (MPa) 0 5 10 0 0.01 0.02 0.03 0.04 0.05 0.06 Strain Stress ( Tensile Strengths • Wood is very week in Tension Perpendicular to Grain • It is a brittle failure mode that is highly undesirable • If possible avoid provide designs that avoid tension perpendicular to grain stresses Tensile Testing machine of full size members UTS of OSL (32 mm x 140 mm) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 20 30 40 50 UTS (MPa) Cumulative Probability Shear Strengths