Browsing by Author "Khechai, Abdelhak"

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    Natural Frequency Analysis of Rectangular Laminated Sandwichs Plates Using 2D Layerwise FE Model
    (University of Eloued جامعة الوادي, 2018-12-10) Belarbi, Mohamed-Ouejdi; Tati, Abdelouahab; Khechai, Abdelhak
    The natural frequency analysis of rectangular laminated sandwichs plates has been investigated, using a new higher-order layerwise finite element formulation. A first-order displacement field is assumed for the face sheets, whereas a higher-order displacement field is assumed for the core. Unlike the conventional layerwise models, the number of variables in the present model is fixed and does not increase when increasing the number of lamina layers. This helps to reduce the computational cost of the analysis. The performance and reliability of the proposed formulation are demonstrated by comparing the author’s results with those obtained using the three-dimensional elasticity theory, analytical solutions and other advanced finite element models. From the obtained results, it was shown that the proposed finite element model provided a better prediction on the natural frequency a rectangular laminated sandwichs plates.
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    Strength degradation of E-glass plates with circular and square notches
    (University of Eloued جامعة الوادي, 2018-12-10) Khechai, Abdelhak; Belarbi, Mohamed Ouejdi; Rekbi, Fares Mohammed Laid
    In the current investigation, our objective is to determine experimentally the stress concentration in multilayered perforated composite plates subjected to uniaxial tensile loading. The stress concentration factors (SCFs) around circular and square notches are calculated using Digital Image Correlation (DIC) technique. On the other hand, the Finite Element Method (FEM) using FreeFem++ software is employed to validate numerically the experimental findings. The tensile strength degradation of E-glass laminated plates with both circular and square holes is also addressed in the present work through a combination of experimental and numerical studies. The DIC technique is used to obtain full-field surface strain measurements in notched specimens with different hole shapes and sizes, in order to show their effects on SCF and failure strength and failure mechanism.