Evaluation of increase in loss tangent from longitudinal vibration of wood log by considering apparent density difference between sapwood and heartwood caused by moisture content

Article Forestry

Moisture content estimation of green softwood logs of three species based on measurements of flexural vibration

Toshiyuki Fukui et al.

Summary: This study estimated the moisture contents of sugi, todomatsu, and hinoki logs using a new method and found that the regression line of the correlation between specific dynamic Young's modulus and tangent loss of green wood was different from that of moisture-conditioned wood and showed species dependency. Regression lines at the fiber saturation point were constructed for each species to estimate the moisture contents of 86 logs.

JOURNAL OF WOOD SCIENCE (2023)

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Review Forestry

Moisture content dependence of anisotropic vibrational properties of wood at quasi equilibrium: analytical review and multi-trajectories experiments

Iris Bremaud et al.

Summary: This article provides a comprehensive view on the relationship between wood vibrational properties and equilibrium moisture content (EMC). Experimental results suggest that tan delta is more sensitive to EMC changes than E'/gamma, with radial properties being more sensitive than longitudinal properties, resulting in increased anisotropy with higher EMC levels. Hysteresis is observed in vibrational properties in relation to relative humidity (RH), but minimal hysteresis is seen in relation to EMC.

HOLZFORSCHUNG (2021)

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Article Forestry