Measurement of the dynamic modulus of elasticity of wood panels

Abstract

This study investigated the dynamic modulus of elasticity (DMOE) of wood panels of Fraxinus mandshurica, Pinus koraiensis, and Juglans mandshurica using the natural frequency measurement system of fast Fourier transform (FFT). The results were compared with the static modulus of elasticity (E_S) tested by a mechanical test machine. The results show a significant correlation between E_S, transverse vibration DMOE (E_F), and longitudinal vibration DMOE (E_L). For all of these species, the correlation between E_S, E_F and E_L is more significant than the individual species, which indicated that the FFT method is universal. The correlations between E_s and sample s density (ρ) are significant, but the correlation coefficient of E_S and ρ is lower than those between E_F, E_L and E_S. The E_S of wood is more accurately tested by the analysis based on FFT measurement than by the estimation based on density.