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Article Dans Une Revue Wood Material Science and Engineering Année : 2023

Fracture properties of thermally modified spruce wood (Picea abies) at different moisture contents

Résumé

The effects of different levels of thermal modification of spruce wood on the fracture properties of wood exposed to different moisture contents was investigated. Specimens were thermally modified at temperatures of 180 °C, 200 °C and 230 °C and then equilibrated together with unmodified specimens at relative humidities of 20 %, 44 %, 76 % and 88 %. Double cantilever beam specimens with TL and RL orientation were used for testing. The crack length was determined by digital image correlation and the compliance of the specimen was determined by multiple unloading of the specimen. The strain energy release rate was calculated, which decreased with increasing degree of modification and increased with increasing moisture content. The analysis showed that the strain energy release rate increased more with moisture content for unmodified samples, while the dependence of the release rate on moisture wasn't so clear for modified samples. The strain energy release rate values are higher in the TL orientation than in the RL orientation, while the crack length has no significant influence. The highest strain energy release rate was 0.256 N/mm for the unmodified TL specimens exposed to 88 % relative humidity and the lowest was 0.071 N/mm for the RL orientation of the thermally modified specimens at 220 °C and then exposed to 88 % relative humidity. From all measurements, functions were fitted to calculate the strain energy release rate as a function of orientation, degree of modification, moisture content and density of the spruce wood, which can be used to calculate the strain energy release rate for any combination of the factors studied.
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Dates et versions

hal-04364390 , version 1 (28-12-2023)

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Miran Merhar, Rostand Moutou Pitti, Tom Argensse. Fracture properties of thermally modified spruce wood (Picea abies) at different moisture contents. Wood Material Science and Engineering, 2023, 18 (6), pp.2093-2103. ⟨10.1080/17480272.2023.2228280⟩. ⟨hal-04364390⟩
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