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Quantitative Fiber Orientation Analysis of Carbon Fiber Sheet Molding Compounds using Polarization Imaging and X-Ray Computed Tomography
Miro Duhovic, Alex Keilmann, Dominic Schommer, Claudia Redenbach, Katja Schladitz
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For the quality inspection of carbon fiber sheet molding compounds, polarization imaging is a promising alternative to more established methods like computed tomography, since it is cheaper, faster, and provides a larger field-of-view. For uni- and bidirectional carbon fiber reinforced composite materials, machine vision cameras with on-chip polarized image sensors have been successfully validated for visualizing fiber orientation. Although this imaging technique is already being applied to multidirectional materials, to our knowledge, it has not yet been validated for such materials. In this paper, fiber orientations obtained by angle of linear polarization images (AOLP) of commercially available pressed carbon fiber sheet molding compound materials are compared with orientations estimated from computed tomography scans. The fiber orientations in the computed tomography images are estimated using the maximal response of anisotropic Gaussian filters and the deviation between orientations estimated from polarization and computed tomography images is calculated. Both imaging methods showed encouraging visual similarity, but also notable numerical differences, which are discussed in depth. Moreover, it is shown that the surface layer fiber orientation is representative of the fiber orientation through the entire specimen.
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