Planar Strain Measurements on Wood Specimens |
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Authors: | K B Dahl K A Malo |
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Institution: | 1.Department of Structural Engineering,Norwegian University of Science and Technology, NTNU,Trondheim,Norway;2.Multiconsult AS,Oslo,Norway |
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Abstract: | Wood specimens have been tested for compressive loading in the longitudinal direction. Planar deformation was recorded by
means of video extensometry on the specimen surfaces. A post processing routine was developed to calculate stress and strain
values from the sampled data. The routine made use of mathematical framework used in the finite element method. Material parameters
were detected by means of an optimization algorithm, and the determined linear elastic parameters were in general found to
be in good agreement with values given in literature. The utilized method offers simultaneous average values for active, passive
and shear strains from the measured area. Moduli of elasticity, Poisson’s ratios and shear deformation can thus be evaluated.
In addition, the variation of the three strain components over the area is measured. The results can therefore be used for
quantification of material inhomogeneity and are further suitable for direct comparison with numerically computed strains
comprising non-uniform strain fields. Since video extensometry does not require any physical contact with the specimen, measurements
can be undertaken until failure. The present method offers thus an efficient and relatively accurate way to measure and evaluate
the material characteristics of anisotropic and inhomogeneous materials like wood. |
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Keywords: | Wood Material characterization Video extensometry |
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