Abstract
Abstract In this work, a method for dynamic testing of Poisson’s ratio of dimension lumber was proposed, based on the strain oscillation curve of first-order bending vibration of a cantilever plate. The method is efficient and convenient with good repeatability and high accuracy. Poisson’s ratios along grain and across grain (μLR and μRL, respectively) on radial sections (LR section) and across grain (μRT) on transverse sections of Sitka Spruce specimens were measured. The results show that the Poisson’s ratio along grain on the LR section μLR is one order higher than that across grain on the LR section μRL. Additionally, the accuracy of the elastic modulus of cantilever plate specimens calculated by theoretical equations of cantilever beam was analyzed. For cantilever plate of Sitka Spruce with an aspect ratio of four, the error of elastic modulus calculated with the cantilever formula is 0.7 %.
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