Mechanical Properties of Red Oak Related to Drying

Perpendicular to grain static tension tests at 0?, 45?, and 90? to the growth rings, and compression tests at 0? to the growth rings, were carried out at 80?, 130?, 180?F., and at 6, 12, 18 percent moisture and green. MOE and stress at proportional limit in tension and compression and maximum stress in tension and stress at 2.5 percent strain in compression were all reduced by increasing temperature from 80? to 180?F. and increasing moisture content between 6 percent and F.S.P. The effect of temperature was greater at higher moisture content. Tensile properties at 0? to growth rings are similar to those at 45? to growth rings while those at 90? are much greater under the same conditions of temperature and M.C. Strain at maximum load in tension was not dependent on angle to the growth rings and increases with increasing temperature. MOE under loading at 0? to growth rings in tension is not significantly different from that in compression. Static properties can be permanently reduced by kiln conditions. Creep and stress relaxation are increased by increasing temperature, M.C., or initial stress.

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