Browsing by Author "Abdin, Y"

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    Description of draping behaviour of woven fabrics over single curvatures by image processing and simulation techniques
    (ELSEVIER, 2013) Abdin, Y; Taha, I; El-Sabbagh, A; Ebeid, S
    The use of natural fibres in polymer composite applications has gained great attention over the last decade, due to weight, economic and environmental aspects. Processing textile reinforced composites in various lay-up, resin infusion or compression moulding techniques requires good reproduction of mould shape. Thus, this study is concerned with the analysis of deformation and draping behaviour of woven fabrics over single curvatures. Experimental investigations of draping several jute and glass fibre woven fabrics of varying densities over a standard circular disc have been performed. Draping behaviour was analysed using image processing techniques and MATLAB application. Further simulation of the draping patterns has been achieved using PamForm software. Good prediction of draping behaviour of woven textiles is accessible, but requires a set of preliminary experiments to well characterise the fabric in question.
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    Direct Mori-Tanaka calculations of strains in ellipsoidal inclusions with multiple orientations – Comments on the papers: Naili, G. et al. Comp Sci Tech, 187: 107942, 2020 (https://doi.org/10.1016/j.compscitech.2019.107942) and Jain, A. et al., Comp Sci Tech, 87: 86–93, 2013
    (ELSEVIER LTD, 04/12/2020) Lomov, S.V; Van Paepegem, W; Abdin, Y; Jain, A
    Recently, Naili et al. [1] compared the predictions of strains in inclusions by two methods viz. FE-MT and FE-Voigt for RVE containing 2D ellipsoidal inclusions. In this schemes, multiphase composite (composite having fibers with varying orientations) are homogenized by first homogenizing “pseudo-grains” consisting of fibers having same orientation and aspect ratio using full field Finite Element (FE) simulations. The second step of the homogenization was subsequently performed using the Mori-Tanaka (MT) formulation (the method designated as “FE-MT” homogenization) and the Voigt approximations (“FE-Voigt”). FE homogenization was chosen as the first step of homogenization to ensure that the comparison is “unbiased”. It is known that for uni-directional composites, the MT formulation and FE yield identical results for effective stiffness as well as the strains in the inclusions. Thus, the first step of homogenization could have been MT formulation with no or little change in the results. Further, Naili et al. show that MT-MT is equivalent to the full analytic MT formulation while MT-Voigt is equivalent to the pseudo-grain discretized formulation of the Mori Tanaka homogenization [2].
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    Geometrical characterization and micro-structural modeling of short steel fiber composites
    (ELSEVIER, 2014) Abdin, Y; Vladimirovitch Lomov, Stepan; Jain, Atul; Van Lenthe, GH; Verpoest, Ignace
    Short steel fiber reinforced polymer composites are a newly introduced class of materials which combines outstanding properties of stiffness and ductility. The first step in modeling composite mechanical properties is the generation of a representative volume element (RVE) which accurately describes the distinctive microstructure of the material. Injection molded short steel fiber composites exhibit a complex microstructure due to the three-dimensional orientation, waviness and entanglements of the fibers. The present work proposes a data structure for description of the RVE geometry and algorithms for RVE random generation. The micro-structure of short steel fiber reinforced polycarbonate samples was determined using X-ray micro-computed tomography (micro-CT) and the model input parameters were identified using a specialized image processing methodology, based on the Mimics software package. Model generated RVEs were satisfactory compared qualitatively as well as quantitatively against the real micro-CT reconstructed volumes.
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    Influence of particle shape and size on the wetting behavior of soft magnetic micropowders
    (ELSEVIER, 2011) Kirchberg, S; Abdin, Y; Ziegmann, G
    In the present study the effects of the particle shape, size and size distribution on the wetting behavior of soft magnetic micropowders are investigated. For this purpose, capillary rise experiments based on Washburn theory for contact angle determination were conducted using capillary rise method in standard tensiometer. Two particle materials were used—spherical Iron Silicon particles (FeSi) and irregular shaped Magnetite particles (Fe3O4) with the following particle size distributions: 0–20, 20–40, 40–63, 63–80 and 80–100 μm. Moreover, standard liquids of varying surface tensions were used to investigate the effect of liquid properties on the wetting behavior. It was found that larger particle sizes yield lower contact angles and consequently improved wetting. Similarly, with constant particle size, FeSi particles exhibit lower contact angles compared to Fe3O4 particles due to their regular particle shape. Finally, effect of liquid was such that lower liquid surface tension results in lower contact angles