Biomechanics of a branch-stem junction in softwood
Muller, U., Gindl, W. and Jeronimidis, G. (2006) Biomechanics of a branch-stem junction in softwood. Trees-Structure and Function, 20 (5). pp. 643-648. ISSN 0931-1890
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To link to this article DOI: 10.1007/s00468-006-0079-x
Direct measurement of strain field in a mechanically loaded Norway spruce branch-stem junction was performed by means of electronic speckle pattern analysis. Results were compared with strain distribution in a polyester cast of identical shape as the branch-stem junction, and a simplified polyester model consisting of two half-cylinders. Compared to polyester models, the branch-stem junction was characterised by a very homogeneous distribution of strain, which can be interpreted as a homogeneous distribution of stress in terms of fraction of material strength. This optimised transfer of mechanical load from the branch to the stem is achieved by a combination of naturally optimised shape with, additionally, optimised mechanical wood properties in the junction area.