Creep and Other Strain Behavior of Wood in Tension Parallel to Grain

The creep behavior of Tilia Americana, Cedrela huberi, and Dicorynia paraensis was studied at a 30 minute sustained load period for stress levels of 5 to 85 percent of ultimate tensile strength. ASTM Standard D805-52 was followed with strains being measured with strain gages. The threshold of permanent set was 25 to 30 percent of the stress level-region for Tilia and 30 to 35 percent for Cedrela. When there was no apparent trend between creep and test number, creep values were reproducible to within 5 mcroinches. Creep began between zero and 5 percent stress levels in Tilia and Cedrela and between zero and 10 percent stress levels in Dicorynia. Differences in specific gravity did not account for the entire observed differences in creep response between species. The species tested did not behave according to Hooke’s Law in tension parallel to the grain.

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