Abstract
Gaining insights into the effects of microstructural details on materials behavior may be achieved by incorporating their attributes into numerical modeling. This requires us to make considerable efforts to feature heterogeneity morphology distributions and their spatial arrangement. This paper focuses on modeling the scatter observed in materials heterogeneity geometry. The proposed strategy is based on the development of a 1D-shape signature function representing the 2D-section of a given shape, on Fourier basis functions. The Fourier coefficients are then considered as random variables. This methodology has been applied to flax fibers which are gradually introduced into composite materials as a potential alternative to synthetic reinforcements. In this contribution, the influence of some underlying assumptions regarding the choice of one 1D-shape signature function, its discretization scheme and truncation level, and the best way of modeling the associated random variables is also investigated. Some configurations coming from the combination of these tuning parameters are found to be sufficiently relevant to render efficiently the morphometric factors of the observed fibers statistically speaking.
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The authors wish to thank Brigitte Gaillard-Martinie from the INRA of Theix for the sample preparation and the optical micrographs of flax elementary fibers and bundles.
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Mattrand, C., Béakou, A. & Charlet, K. Fourier based methodology for simulating 2D-random shapes in heterogeneous materials. Comput Mech 56, 371–388 (2015). https://doi.org/10.1007/s00466-015-1176-8
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DOI: https://doi.org/10.1007/s00466-015-1176-8