Distribution of Drilling Resistance and Strength Properties at the Base of Trees
R. Kappel, C. Mattheck Forschungszentrum Karlsruhe GmbH Institute for Materials Research II P. O. Box 3640, 76021 Karlsruhe, Germany
ABSTRACT
As a result of evolution over millions of years biological structures are highly optimised. Beside the aspect of optimum shape and structure the use of suitable material is of main importance to reach highest adaptation to existing loads. At the base of trees external loads are transferred into the soil due to the root swellings. Distribution of drilling resistance and strength properties at the base of trees have been determined for different species having different root systems. The drilling resistance was measured in the root swellings and between them by use of IML-Resi F300 E. Afterwards an increment core was taken from those places and radial and tangential bending strength, shear strength and longitudinal compression strength was determined by the use of Fractometer III. In addition wood anatomical investigations have been done. Dependent on the species different distributions have been established.
Publication Source: Proceedings of the 12th International Symposium on Nondestructive Testing of Wood University of Western Hungary, Sopron, 13-15 September 2000, ISBN 963 7180 88 5 Publisher: University of Western Hungary, H 9400 Sopron, P.O.Box 132, FAX: +36 99 311 103
