Abstract
Over the last fifteen years an extensive programme of work on quantifying and predicting creep behaviour of particleboard has been undertaken. This paper first sets out some of the philosophy underlying the selection of test methodology used, and then proceeds to summarise and highlight the principal results obtained under both steady- and unsteady-state environments. Very strong interactions were found in the analysis of variable influencing creep behaviour. The reasons for adopting rheological models as predictive tools are discussed and the merits of a 5-parameter model are illustrated. A 4-parameter model is used to obtain the relative proportions of the three components of creep deflection under different conditions: this procedure clearly demonstrates the significant role of the viscous component in determining creep deflection at high levels of stress and relative humidity.
Zusammenfassung
Während der letzten 15 Jahre ist ein umfangreiches Programm zur Quantifizierung und Vorhersage des Kriechverhaltens von Spanplatten durchgeführt worden. In diesem Beitrag werden zunächst grundsätzliche Überlegungen zur Auswahl der Testmethoden vorgestellt. Danach wird summarisch über die hauptsächlichen Ergebnisse der Untersuchungen unter konstanten und wechselnden Umgebungsbedingungen berichtet. Es wurden starke Wechselwirkungen der einzelnen Variabeln gefunden, welche das Kriechen beeinflussen. Die Gründe, warum rheologische Modelle zur Vorhersage herangezogen wurden, werden diskutiert und die Vorzüge eines 5-Parameter-Modells dargestellt. Ein 4-Parameter-Modell wird verwendet, um die relativen Anteile der drei Komponenten der Kriechverformung unter verschiedenen Bedingungen herauszufinden. Dieses Vorgehen zeigt deutlich die Bedeutung des visco-elastischen Anteils beim Bestimmen der Kriechverformung unter hohen Belastungen und hoher relativer Feuchte.
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Dedicated to Prof. Dr. Horst Schulz on the occasion of his 65th birthday.
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Dinwoodie, J.M., Higgins, J.A., Paxton, B.H. et al. Creep research on particleboard. Holz als Roh-und Werkstoff 48, 5–10 (1990). https://doi.org/10.1007/BF02607843
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DOI: https://doi.org/10.1007/BF02607843