Stress at deformations beyond the elastic limit for compression perpendicular to the grain in hem-fir Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hx11xk896

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  • Allowable stresses in compression perpendicular to the grain (C-perp) have been too conservative for most structural uses. This study develops stress data for deformations beyond the proportional limit (PL), up to 0.1 inch for hem-fir. Fifteen boards from four western states were cut into small specimens representing three ring angle classes (0, 45 and 90 degrees) and one large specimen with varying ring angle. Specimens with ring angle of about 45 degrees were the weakest. Stresses for large specimens and small specimens with 45-degree ring angle were remarkably similar. Stresses in C-perp continually increase beyond PL to at least 0.1 inch deformation without any noticeable failure. If allowable stresses in C-perp were accepted beyond PL, acceptable deformation would then be the new design specification.
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