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Acoustic emission and surface checking inEucalyptus regnans boards during drying

Schallemission und Rißbildung während der Trocknung von Brettern aus E. regnans

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Abstract

Acoustic emission (AE) was measured in drying 30mm thickEucalypotus regnans F. Muell. boards. Incipient surface checks were detected with a hand-held 10-times magnifying glass. Surface checks occurred at a very nearly constant AE rate (ring-down counts) in the backsawn and quartersawn boards dried at temperatures in the vicinity to 20°C. At higher temperatures, collapse shrinkage beneath the board surface caused localised surface checking at significantly lower AE rates. AE is hypothesised to be generated by intermittent slips in the crystalline regions of the cellulose microfibrils comprising fibre cell walls.

Zusammenfassung

Akustiche Emissionen (AE) wurden während der Trocknung von 30 mm dicken Brettern ausE. regnans F. Muell. gemesen. Beginnende Rißbildung an der oberfläche wurden mittels einer Handlupe (10-fach) festgestellt. Bei Trocknung mit Temperaturen um 20°C trat an Brettern mit liegenden und stehenden Jahrringen die Buildung von Obeflächenrissen gleichzeitig mit einer bestimmten AE-Rate (ringdown counts) auf. Bei höheren Temperaturen verursachten Schumpfungsprozesse unter der Holzoberfläche lokal begrenzte Rißbildungen bei deutlich niedrigeren AE-Raten. Die AE werden laut Hypothese durch periodisch aufttretende Verschiebungen im kristallinen Bereich der Cellulosemikrofibrillen, welche die Zellwand aufbauen, hervorgerufen.

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Authors and Affiliations

  1. Civil and Mechanical Engineering Department, University of Tasmania, P. O. Box 252C, 7001, Hobart, Australia

    J. D. Booker

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  1. J. D. Booker
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This work was undertaken with the assistance of an Australian Postgraduate Research (Industry) Award.

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Booker, J.D. Acoustic emission and surface checking inEucalyptus regnans boards during drying. Holz als Roh-und Werkstoff 52, 383–388 (1994). https://doi.org/10.1007/BF02615389

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