3d Characterization of Wood Based Fibrous Materials: An Application

Abstract

Morphological characterization of wood based fibrous materials is carried out using X-ray tomography. This technique allows the non destructive observation at the scales of a fibre (microscopic scale) and of a network of fibres (mesoscopic scale). The 3D images are processed using classical tools of mathematical morphology. Measures of porosities and estimations of the size distributions of fibres and pores are carried out and compared to other results. An alternative method for the calculation of the local orientation of the fibres is also described to quantify the anisotropy of the fibres network. Finally, the individualization of the fibres is obtained from the representation of the fibrous network as a 3D skeleton, making possible further measurements on the isolated fibres.

Automatic Segmentation and Structural Characterization of Low Density Fibreboards

“…However, these approaches may break down if some fibers are heavily damaged or if the fibrous medium is a composite made up of solidcore and hollow fibers. For such composite materials like those we are studying in this paper, it seems more interesting to fill the inner porosity of the vegetable fibers (Lux et al, 2006;Walther et al, 2006;Malmberg et al, 2011) so that it is possible to use algorithms dedicated to the segmentation of solid-core fibers.…”

“…At each node of the skeleton, tests are carried out to form pairs of paths that show the most similar orientation. Individualized fibers can then be reconstructed by geodesic dilation of the segmented skeleton in the initial image (Lux et al, 2006). In this work, we are interested in these kind of methods based on the segmentation of the skeleton, which are well suited to deal with low density fibrous materials.…”

“…Most important characteristics are the effective density, the number and the nature of fiber-fiber contacts, and the orientation, shape and tortuosity of the fibers. Although a lot of structural parameters are readily accessible without any prior segmentation, e.g., porosity, size distributions, local or global orientations (Lux et al, 2006;Altendorf and Jeulin, 2009), the individualization of each fiber allows for complementary measures (like the number of fiberfiber contact) to be carried out on the segmented image. The segmentation of complex fibrous materials is however still a challenging issue, especially when the fibers cover a wide range of sizes and shapes, as is often the case with vegetable fibers.…”

“…In Eberhardt and Clarke (2002) the medial axis of the fibers is reconstructed with the help of the local orientation vectors (Creighton et al, 1999). In Yang and Lindquist (2000), Lux et al (2006) and Tan et al (2006), the segmentation is performed on the medial axis of the fibers which is a simpler representation of the actual fibers network. At each node of the skeleton, tests are carried out to form pairs of paths that show the most similar orientation.…”

Three-Dimensional Fiber Segment Orientation Distribution Using X-Ray Microtomography

“…employed XMT to characterise local orientation of wood-based fibrous media by mathematical morphology and computed in-and out-of-plane fibre orientations. (Lux, et al, 2011) In another study, mathematical morphology tools were used to characterise local orientations, in few samples directions, from XMT data of carbon fibre reinforced composites. (Altendorf & Jeulin, 2011) Axelsson used segmentation to track the individual cellulosic fibres in XMT scan of cellulosic fibre reinforced composite.…”