Browsing by Author "Taha, Iman"

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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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    Modeling of strength and stiffness of short randomly oriented glass fiber—polypropylene composites
    (SAGE PUBLICATIONS LTD, 2011) Taha, Iman; F Abdin, Yasmine
    This study presents an approach toward better understanding of the mechanical behavior of short discontinuous randomly oriented fiber-reinforced composites. Due to their expanded use, the combination of polypropylene (PP) matrix and glass fibers (GFs) was chosen as an example of an injection-molded short fiber system to represent the complex class of materials. Based on the systematic evaluation of available mathematical models for the estimation of mechanical behavior, in addition to the analysis of microscopic observations, improved models for the prediction of composite stiffness and strength were developed. The models developed in this study, take into consideration several aspects that are found in a nonperfect composite, such as fiber length, preparation and orientation, fiber—matrix bonding, and processing conditions. The new models show a good description of the actual behavior, not only for the GF—PP system under consideration, but also for various other short-fiber polymer composites cited by the literature, such as carbon and natural fiber systems