Honors College Thesis

 

Location of the neutral axis in wood beams Public

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  • It is commonly accepted that for the analysis of wood beams, the neutral axis coincides with the centroid of the beam. Although this assumption is used in analysis, wood is not an isotropic material, as it has different elastic properties in the tangential, radial and longitudinal directions, nor is it homogenous, as it contains characteristics, such as knots, at various locations in the material. Because of this, there is a need for an analysis of the neutral axis for anisotropic, non-homogenous materials, such as wood, in order to better predict the deformations and strains in such materials. Specifically, with the use of Digital Imaging Correlation, a non-contact technique used to measure the deformation of an object’s surface, this project examines how knots in wood influence the location of the neutral axis. The output from the VIC-3D digital imaging correlation software provides a clear image of the location of the neutral axis. From this project it is apparent that the neutral axis in the clear beam remained close to the centroidal axis throughout loading, while the location of a knot within the beam determines the size of the compression and tension zones as well as the location of the neutral axis.
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