Bending Strength of Particle Board Under Long-Term Loading

High and low density particle boards made with urea or phenolic resins were tested in bending under long-term load. Failure and deflection data were obtained. Boards behaved about the same as whole wood of the same MC. Density and type of resin did not appear significant. The stress at failure is reduced by long-term loading at an extremely fast rate to a stress level equal to about 80 percent of the material’s normal strength. Beyond this level, the stress at failure appears to decrease linearly with the logarithm of the duration of loading. The deflection pattern in particle board investigated is similar to that found in whole wood. Contrary to St. Venant’s hypothesis, the total deflection at failure in particle board is considerably lower at the lower stress level.

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