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Douglas fir ( Pseudotsuga menziesii ) lumber was tested in terms of off-axis modulus of elasticity (MOE off-axis ) and off-axis logarithmic decrement ( λ  off-axis ) by longitudinal and flexural vibration (VT long  and VT flex ) methods. Similar to the results obtained in a previous study, these results indicate that the values of MOE off-axis  are dependent on the length-to-width ratio of specimens when the value of off-axis angle ( θ ) is approximately 15°. Although the  λ  off-axis  values are also dependent on the length-to-width ratio, the dependence is not pronounced over a specific range of  θ . To measure the  λ  off-axis  value accurately, as well as the MOE off-axis  value, the specimen should be sufficiently slender.

holzforschung

Effect of specimen configuration on the measurement of off-axis logarithmic decrement of solid wood measured by longitudinal and flexural vibration tests