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Verhandlungen
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DPG

Berlin 2008 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 26: Posters II

BP 26.10: Poster

Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A

Mechanical properties of Wood investigated using X-Ray Scattering under defined humidity conditions — •Tomasz Pazera1, Igor Krasnov1, Imke Diddens1, Florian Kunze1, Henning Vogt1, Richard Davies3, Manfred Burghammer3, Sergio S. Funari2, and Martin Müller11Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel — 2HASYLAB at DESY, Hamburg — 3ESRF, Grenoble, France

Wood is a composite material that mainly consists of stiff cellulose crystals surrounded by a softer, water adsorbing matrix. The mechanical properties of pine earlywood have been studied in combined X-ray diffraction and stretching experiments at defined humidity conditions. We observed explicit variations in both the crystal strain and the stress-strain curves of wood. The most radical discrepancy in the behaviour of the whole wood-fibre was estimated to happen between 85%-100% relative humidity. In this range, the matrix shows strong macerating effects. By stretching in direction of the fibre axis we received information about changes in the correlation of crystal strain and force transfer inside the fibre at different humidities. Furthermore, an investigation of single fibres shows explicit changes in the orientation of the microfibrils in the cell wall.

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