WAVET*, a custom device able to measure viscoelastic properties of wood under water-saturated conditions. (* WAVET : Environmental Vibration Analyser for Wood)
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Universidad del Bío Bío
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This work presents an original experimental device conceived to characterise the viscoelasticproperties of wood. Classically, the dynamic mechanical analysis of wood is performed using acommercial apparatus like a DMA (Dynamic Mechanical Analyser). However, when analysing woodwith this type of apparatus, many problems related to the hygroscopic behaviour and the orthotropicstructure of wood may be encountered. This is why an original apparatus perfectly adapted to the woodfeatures has been developed. The WAVET is able to measure the viscoelastic properties of wood samplesunder water-saturated conditions, in the temperature range of 5°C to 95°C at frequencies varying between0.005 Hz and 10 Hz. Samples are tested in a cantilever confi guration. The whole experiment has beendesigned to withstand the severe conditions of temperature and humidity.At the same time, an analytical model based on Kelvin s elements has been developed. This modelis able to correct experimental measurements performed close to the resonance frequency.Results obtained for beech samples in radial and tangential directions using the WAVET and acommercial apparatus (DMA 2980 TA Instruments) are compared and discussed. This comparisonunderlines the relevance of the WAVET device.
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