Rate of Loading Effect on Tensile Strength of Wood Parallel to Grain

Rate of loading experiments with matched specimens of western hemlock, 1 1/4 by 2 inches in cross section and six feet long showed that loading rate had no significant effect on tensile strength or modulus of elasticity in the range of loading rates from 20 to 880 psi per second. However, stress at the proportional limit did increase significantly as loading rate increased from 20 to 880 psi per second. Rate of loading had no significant effect on the tensile strength of small, clear, straight-grained specimens of Douglas-fir, 3/8 by 3/8 inches in cross section and 27 inches long.

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