Graduate Thesis Or Dissertation
 

A study of several anatomical variables in relation to their effect on tensile strength of Douglas-fir

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  • A microscopic study was conducted on specific gravity wafers taken from standard tensile strength specimens of young growth Douglas-fir. Samples were studied to determine the effect of variables such as percent summerwood, fiber length and fibril angle on tensile strength of Douglas-fir. The sample specimens were picked so effects of specific gravity on tensile strength variation would be reduced. Three groups of tensile strength specimens were picked for the study. One group of 5k samples had an average specific gravity of .43. The two remaining groups had specific gravity averages of .38 and .52. Fibril angle was found to be an important variable contributing to tensile strength of Douglas-fir in samples of .43 and .52 average specific gravity. Fiber length was not found to be an important factor affecting tensile strength of Douglas-fir. Thermal heat conductivity ratio was closely correlated with fibril angle of specimens with .38 and .52 specific gravity. Thermal heat conductivity ratio did not correlate with tensile strength of the specimens.
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