Failure Theories for Douglas‐Fir in Tension

Authors:
Publisher website
Google Scholar
Abstract
This study investigated the tensile strength of Douglas-fir loaded at an angle to the grain. Strength was determined for grain angles of 15, 30, 45 and 60 degrees in the radial-longitudinal plane. Strength was found to drop dramatically from a grain orientation of zero to 15 degrees. Hankinson's formula, the Tsai-Hill failure theory and the recently developed hyperbolic formula were compared to the experimental data to determine which theory gave the best prediction. Hankinson's formula with s = 1.5 and n = 2, and the Tsai-Hill theory overstated strength at 15 degrees and did not provide a good prediction of the data at the remaining grain angles. The hyperbolic formula was found to give an accurate prediction of the data at all grain angles tested.

This publication has 2 references indexed in Scilit: