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  • A mixed Boolean and deposit model for the modeling of metal pigments in paint layers
    Couka, Enguerrand ; Willot, François ; Jeulin, Dominique
    Pigments made of metal particles of around 10 micro m or 20 micro m produce sparkling effects in paints, due to the specular reflection that occurs at this scale. Overall, the optical aspect of ... paints depend on the density and distribution in space of the particles. In this work, we model the dispersion of metal particles of size up to 50 micro m, visible to the eyes, in a paint layer. Making use of optical and scanning electron microscopy (SEM) images, we estimate the dispersion of particles in terms of correlation functions. Particles tend to aggregate into clusters, as shown by the presence of oscillations in the correlation functions. Furthermore, the volume fraction of particles is non-uniform in space. It is highest in the middle of the layer and lowest near the surfaces of the layer. To model this microstructure, we explore two models. The first one is a deposit model where particles fall onto a surface. It is unable to reproduce the observed measurements. We then introduce a "stack" model where clusters are first modeled by a 2D Poisson point process, and a bi-directional deposit model is used to implant particles in each cluster. Good agreement is found with respect to SEM images in terms of correlation functions and density of particles along the layer height.
    Vir: Image analysis & stereology : official journal of the International Society for Stereology. - ISSN 1580-3139 (Vol. 34, no. 2, jun. 2015, str. 125-134)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2015
    Jezik - angleški
    COBISS.SI-ID - 32512217

    Povezava(-e):

    http://www.ias-iss.org/ojs/IAS/article/view/1220
    Digitalna knjižnica Slovenije - dLib.si
    DOI

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