Browsing by Author "BREK Samir"

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    Analysis of Stresses on a Pre-cracked Cup of a Total Hip Prosthesis (THP)
    (2022) Meddour Belkacem; BREK Samir
    Zirconia is known as a bioceramic having properties which could make it a substitute material in prosthesis manufacturing field, in the other hand it presents a weak fracture toughness which is the main disadvantage. This work aims to analyze the mechanical behavior of a pre-cracked cup of a total hip prosthesis in severe circumstances by using numerical simulation. ABAQUS-6.8 as a numerical simulation software was used. It is assumed that the prosthesis was implanted in an adult subject under an excessive load. The obtained results were satisfied.
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    Chapter 3- Modeling of the Two-Way Shape Memory Effect
    (IntechOpen, 2018) Meddour Belkacem; BREK Samir
    The shape memory alloys (SMA) are distinguished from other conventional materials by a singular behavior which takes many forms depending on the thermomechanical load. The two-way shape memory effect is one of these forms. The interest that exhibits this behavior is that the material can remember two states, so this leads to many industrial applications. This thermoelastic property is driven by the temperature under residual stress of education. To model this effect in 3D, we considered stress and temperature as control variables and the fraction of martensite as internal variable; choosing Gibbs free energy expression and applying thermodynamic principles with transformation criteria have permitted to write the constitutive equations that control this behavior. The constructed model is then numerically simulated, and finally, the proposed model appears applicable in engineering.
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    Effect of fiber packing on transverse shear modulus G23 of a unidirectional composite material Glass / Epoxy
    (2022) BREK Samir; Meddour Belkacem; BETTAYEB Mohammed
    Composite materials are widely used in the manufacture of mechanical and civil engineering structures. These materials are characterized by heterogeneity and anisotropy, so they present a great challenge of the prediction of the mechanical characteristics of the matrix/fiber mixture and especially in the transverse plane (2-3). The values of the transverse shear modulus G23 are always interesting researchers because of the diversity of results obtained by several approaches (analytical, numerical) and this modulus is used to study the mechanical behavior of composites in 3D. The main objective of this study is the predicting of G23 values within a unidirectional composite material with 44.3% fibers by volume, and to study the effect of the random position of the fibers on the mechanical behavior in shear for ten representative square elementary volumes (RVEs). Each RVE is composed of 16 cells (fiber with matrix or matrix without fiber) with a side of 48 μm. The composite material used in the numerical modeling corresponds to a unidirectional ply (UD) based on epoxy resin and long glass fiber (E) with a circular section. The developed numerical model to determine the transverse shear modulus G23 is carried out using finite element software CASTEM. Ten calculation programs using the GIBIANE language were developed. The obtained results were compared with those obtained by analytical and other available numerical models.
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    Effet de la séquence d’empilement sur la rupture des plaques stratifiées perforées en carbone/époxy
    (Revue des composites et des matériaux avancés, 2013) BREK Samir; Manaa Rabah; Zidani Kamel; Hannachi Bouzid
    The assembly of laminated plate structures or hybrid composite/metal is a key passage in the achievement of aeronautical and aerospace structures, so it is necessary to conduct drilling operations in the laminated plates. The arrangement of fibers and their orientation can change the mechanical properties of the fold, so the designer can change at will the strength of laminated plates by adjusting the fiber orientation and stacking sequence. We consider it essential to take into account the effect of holes and the fiber orientation on all the failure mechanisms. In this work we showed the effect of fiber orientation in each ply and the choice of stacking sequence on tensile strength of laminated plates multi-hole material carbon/epoxy composite loaded in tension.
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    Modélisation de la rupture d’un pli unidirectionnel perforé
    (Revue des Composites et des Matériaux Avancés, 2009) BREK Samir; Manaa Rabah; Zidani Kamel; Zedira Hamma; Djebaili Hamid
    The Composite materials are the subject of several studies because of their high specific characteristics and advantages of the latter to adapt to mechanical stress from a judicious preparation of matrix and reinforcement, particularly laminates of Unidirectional Carbon / Epoxy, are increasingly used for the realization of structures. However, the holding of composite structures can be greatly reduced by the addition of geometric singularitie. This work is to determine the critical distance between two holes in one ply unidirectional carbon / epoxy, tensional and study the effect of the factor of stress concentration on the total ruin and brutal (that is to say wide mixture of fiber and matrix for a unidirectional ply).
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    Numerical Modeling of the Effects of Fiber Packing and Reinforcement Volume Ratio on the Transverse Elasticity Modulus of a Unidirectional Composite Material Glass / Epoxy
    (Revue des Composites et des Matériaux Avancés-Journal of Composite and Advanced Materials, 2020-12-06) BREK Samir; MEDDOUR Belkacem
    Composite materials are very widely used in the manufacturing of structures because of their specific mechanical properties. However, they are characterized by heterogeneity and anisotropy and they present great challenges in designing and also in predicting their behavior by using the numerical simulation. The unidirectional composite material has a more relevant property which is the transverse elasticity modulus E2. The determination of E2 is still interesting researchers because of the diversity of results obtained by several models and approaches. This study aims to predict the transverse elasticity modulus E2 of a unidirectional Glass/Epoxy composite material, the effect of the arrangement fibers on the transverse elasticity modulus and predict the values of the reinforcement factorξ used in the Halpin-Tsai model. To do so first we adopted the micromechanical approach, which is accurate but requires much computing, and we used a calculation code based on FEM method and considered two parameters to vary, which are the volume fraction of fibers and the distribution of fibers. The obtained results of numerical modeling were tightly compared to those obtained by the available analytical models and the adopted approach can be used to predict the transverse elasticity modulus E2 and the reinforcement factor ξ.
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    Numerical Modeling of the Effects of Fiber Packing and Reinforcement Volume Ratio on the Transverse Elasticity Modulus of a Unidirectional Composite Material Glass / Epoxy
    (Revue des Composites et des Matériaux Avancés-Journal of Composite and Advanced Materials, 2020-12-06) BREK Samir; Meddour Belkacem; Groun Brahim
    Composite materials are very widely used in the manufacturing of structures because of their specific mechanical properties. However, they are characterized by heterogeneity and anisotropy and they present great challenges in designing and also in predicting their behavior by using the numerical simulation. The unidirectional composite material has a more relevant property which is the transverse elasticity modulus E2. The determination of E2 is still interesting researchers because of the diversity of results obtained by several models and approaches. This study aims to predict the transverse elasticity modulus E2 of a unidirectional Glass/Epoxy composite material, the effect of the arrangement fibers on the transverse elasticity modulus and predict the values of the reinforcement factorξ used in the Halpin-Tsai model. To do so first we adopted the micromechanical approach, which is accurate but requires much computing, and we used a calculation code based on FEM method and considered two parameters to vary, which are the volume fraction of fibers and the distribution of fibers. The obtained results of numerical modeling were tightly compared to those obtained by the available analytical models and the adopted approach can be used to predict the transverse elasticity modulus E2 and the reinforcement factor ξ.
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    Numerical modeling of the effects of fiber packing on transverse Poisson's ratio ν23 of a unidirectional composite material Glass / Epoxy
    (2022) BREK Samir; Meddour Belkacem; SAOUDI Abdenour; BETTAYAB Mohammed
    In this study, the main objectives will be to predict the Poisson's ratio ν23 of a unidirectional Glass/Epoxy composite material and to study the effect of the arrangement of the fibers on the Poisson's ratio ν23. We used the micromechanical approach and a Castem calculation code based on the FEM method. The results obtained from the numerical modeling were compared with those obtained by the available analytical models.
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    Optimization of the mass of laminated composite structures stressed in membrane and bending
    (2022) BETTAYEB Mohammed; BREK Samir; BEZAZI Abderezak
    Nowadays, industrialists are more and more interested in integrating composite parts into their creations, especially in aerospace, naval, and railway. Where these materials present many advantages, in particular, that allow a reduction of the mass of the parts when they are correctly exploited. Laminated composites offer the greatest flexibility, as they allow a variation in the thickness of the stacks throughout the structure made of composite materials often have the characteristic of being modular structures, i.e. constituted by the assembly of several elementary units. Optimization is the process of designing structures that best meet a given set of criteria. The weight optimization of laminated composite structures is of primary interest especially when one is interested in aeronautical applications, and in order to achieve an efficient optimization, it is then necessary to take into account the optimization variables (materials, orientations, thicknesses of the layers as well as the total number of layers n). This introduces complications both in the formulation and in the solution of the associated optimization problems. In this study, we propose to develop an efficient numerical optimization method to solve the optimal design problem of a laminated structure (with glass/epoxy UD plies) solicited in membrane, bending, or membrane-bending coupling using the classical theory of laminates (CTL) and the two software Scilab and Castem for the validation of the obtained results (constraints and homogenization)
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    Prévision de la ruine des composites stratifiés perforés sous chargement thermomécanique
    (Revue des composites et des matériaux avancés, 2011) BREK Samir; Zidani Kamel; Djebaili Hamid; Manaa Rabah; Zedira Hamma
    The laminated composite structures in the form of plates are increasingly used for the design of mechanical structures. These are generally resistant structures, capable of withstanding mechanical loading and thermo mechanical important. Although the analysis of composite structures is required to a key point in the design of structures, there is lack of studies for laminated composite perforated, especially for high gradient structures are sought by monotonic or cyclic thermo mechanical loading, the transverse cracking is usually the first damage observed in the matrix as a fold disoriented relative to the axis of solicitation. In this work we propose a numerical study to calculate the critical distances between two holes in the plates laminated carbon / epoxy loaded by thermomechanical loadings, we used a software structural analysis by finite element method (Castem2009).