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Impact of temperature on the linear viscoelastic region of wood

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The impact of temperature on the linear viscoelastic region, which is characterized by critical strain, of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) was investigated at various temperatures between–100 and 220°C for specimens with a moisture content of approximately 0.6%. The effect of oscillation frequency on the linear viscoelastic region under various constant temperatures was also examined. The results indicated that critical strain generally decreased with increasing temperature except at –80,–20, 40, 120, and 220°C. These five exceptions were attributed to the occurrence of relaxation processes. With an increase in testing frequency from 1 to 20Hz, the critical strain decreased slightly at all temperatures. It is suggested that the stored elastic energy and yield stress, which were obtained at critical strain, could be indicators to predict wood mechanical performance.

L’impact de la température sur la région viscoélastique linéaire (RVL) du sapin de Chine (Cunninghamia lanceolata (Lamb.) Hook.), caractérisé par une déformation critique, a été étudié à plusieurs températures variant de –100 à 220°C avec des spécimens dont la teneur en humidité était d’environ 0,6%. L’effet de la fréquence d’oscillation sur la région viscoélastique linéaire à diverses températures constantes a également été étudié. Les résultats indiquent que la déformation critique diminue généralement avec l’augmentation de la température de –100 à 200 °C, sauf aux températures de –80, –20, 40, 120 et 220°C. Ces cinq exceptions ont été attribuées au processus de relaxation. Avec une augmentation de la fréquence utilisée pour les tests, de 1 à 20 Hz, la déformation critique a légèrement diminué à tous les niveaux de température. Les auteurs croient que l’énergie élastique emmagasinée et la limite apparente d’élasticité au moment de la déformation critique pourraient servir d’indicateurs pour prédire la performance mécanique du bois.

Document Type: Research Article

Publication date: November 1, 2009

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