Strain Behavior of Wood Subjected to Repetitive Stressing in Tension Parallel to the Grain

This report presents the results of investigations on the effect of stress level on strain behavior for three tropical woods stressed in tension parallel to the grain. The species include Ceiba pentandra, Ocotea rubra, and Licaria cayennensis. It appears that an exponential regression adequately describes the creep-initial strain relationship within the range of initial strain studied. The effect of 100 repetitive load cycles on ultimate tensile stress and ultimate tensile strain was analyzed statistically. It was found that neither of these factors differed significantly from the controls within the range of initial strains tested. Data on specific gravity, ultimate tensile strength, maximum strain, initial strain, MOE, and creep are given for the three species.

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