Application of dynamic mechanical analysis for the study of viscoelastic properties and identification of softwood and hardwood species

Based on experimental studies using dynamic mechanical analysis (DMA) methods, the storage modulus E', loss modulus E", and mechanical loss coefficient tan δ were determined. A comparative characterization of static and dynamic viscoelastic-plastic properties of softwood (European spruce – Picea abies) and hardwood (English oak - Quercus robur) species was provided, depending on the frequency and amplitude of probing harmonic oscillations, to determine the possibility of their identification. The contribution of various frequencies and amplitudes of harmonic oscillations to the formation of the total viscoelastic-plastic response of softwood and hardwood species was determined, and the effect of additional oscillating load on the dynamic parameters of wood was evaluated. The fundamental possibility of using dynamic viscoelastic property parameters for the identification of softwood and hardwood species was demonstrated.