Evaluation of the MOE of Norway spruce by the resonance flexure method

This report is a component of an ongoing study of methods to determine the modulus of elasticity (MOE) of wood. Dynamic methods provide rapid and accurate means to determine the MOE. For 19 clear specimens of 6 epicea common (Norway spruce, picea excelsa) we present a comparison of results from tests by a resonance flexure method with results obtained from static tension tests. The resonance flexure method provides a simpler, more rapidly performed alternative to the classical static tension method, giving MOE values that are nearly identical to those determined by the static tension method. These results, combined with our previously reported comparisons of tests with resonance flexure and static flexure, reveal that the resonance flexure method compares very well with both static methods, and the procedure is performed more easily and very rapidly. We also show that again the results from the resonance longitudinal method yield higher values of MOE, 5 percent higher on average, and the ultrasonic method yields values even higher, 14 percent on average.

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