Browsing by Author "Abdin, Yasmine"

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    Comparison of picture frame and Bias-Extension tests for the characterization of shear behaviour in natural fibre woven fabric
    (SPRINGER, 2013) Taha, Iman; Abdin, Yasmine; Ebeid, Samy
    The investigation of the shear behaviour of technical natural fibres is vital for the insurance of aesthetics and performance of light weight, high strength, and eco-friendly composites. In this study, Egyptian jute fibre plain weave fabrics of various areal densities were investigated to describe their shear behaviour in terms of shear forces, shear angles and shear lock angles, using the Bias-Extension and the Picture Frame test methods. Results show that both methods are valid for natural fibres and produce comparable results. Whereas the Bias-Extension test presents a fast and simple test procedure, the analysis of the results is more complex due to the interaction of non-shear components. On the other hand, the Picture Frame test proves to be time consuming and in need of a more complex test rig, but results in pure shear deformations throughout the sample
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    Effective anisotropic stiffness of inclusions with debonded interface for Eshelby-based models
    (ELSEVIER, 2015) Jain, Atul; Abdin, Yasmine; Van Paepegem, Wim; Verpoest, Ignaas; V Lomov, Stepan
    Inclusions in short fiber reinforced composites (SFRC) suffer from debonding and cannot be directly modeled using Eshelby based mean field methods. This paper proposes a method of treatment of inclusions with debonded interface by replacing them with a fictitious “equivalent bonded inclusion” (EqBI) whose properties are calculated based on the reduced load bearing capacity of the inclusion due to the debonded interface. Approximate expressions are derived for stress redistribution in an inclusion due to the presence of debonded interface for the six elementary loading cases and the corresponding terms in the stiffness tensor are estimated as a function of the reduced average stress in the inclusion. Mechanical equivalence of the EqBI is confirmed by comparison with finite element models having inclusions with debonded interface and the overall stress strain response of a SFRC composite is validated against experimental data.