Browsing by Author "Meddour Belkacem"

Now showing 1 - 12 of 12
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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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    Effect of MoZrN Coating on a Steel XC100
    (Metallofiz. Noveishie Tekhnol, 2016-11-22) Abboudi Abdelaziz; Meddour Belkacem; Chermime Brahim; Djebaili Hamid; Brioua Mourad
    The zirconium nitride ZrN coatings are deposited on substrates of XC100 steel using physical vapour deposition (PVD) technique. Coatings based on nitrides of transition metals (Nb, Zr, Ti, V, ) developed by PVD are known to increase the life of cutting tools, and so they naturally have seen a rapid industrial growth. It is possible to produce ZrN-coatings with variations of nitrogen partial pressure, the residual stresses, the thickness of the thin film, and the friction coefficient depending on the nitrogen content. Usage of nitrogen is a good way to enhance wear resistance and effectiveness in tribological applications.
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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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    One Dimensional Modeling of the Shape Memory Effect
    (Modeling and Numerical Simulation of Material Science, 2013-03-24) Meddour Belkacem; Zedira Hamma; Djebaili Hamid
    This paper aims to build a constitutive model intended to describe the thermomechanical behavior of shape memory alloys. This behavior presents many facets, among them we have considered the simple way of shape memory, which is one of most important properties of shape memory alloys. Because of numerous stages of this effect, the subject was divided into three independent parts. For each part, we built the corresponding thermodynamic potential and we deduced the constitutive equations. To make this model workable, we have developed an algorithm. The simulation was performed using the NiTi as shape memory alloy.
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    One Dimensional Modeling of the Shape Memory Effect
    (Modeling and Numerical Simulation of Material Science, 2013-03-24) Meddour Belkacem; Zedira Hamma; Djebaili Hamid
    This paper aims to build a constitutive model intended to describe the thermomechanical behavior of shape memory alloys. This behavior presents many facets, among them we have considered the simple way of shape memory, which is one of most important properties of shape memory alloys. Because of numerous stages of this effect, the subject was divided into three independent parts. For each part, we built the corresponding thermodynamic potential and we deduced the constitutive equations. To make this model workable, we have developed an algorithm. The simulation was performed using the NiTi as shape memory alloy.
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    Three Dimensional Modeling and a Simulation of the Shape Memory Effect
    (Scientific Technical Review,, 2014) Meddour Belkacem; Zedira Hamma; Djebaili Hamid
    The paper deals with modeling and simulating the shape memory effect , one of many behaviors of shape memory alloys. The effect was first divided into three stages. Every stage has its own thermodynamic potential and constitutive equations. The martensite fraction is the only internal variable to be considered: in the first stage, it represents the fraction of detwinned martensite; in the second stage, it represents the fraction of transformed martensite into austenite, and in the last stage, it represents the fraction of the produced martensite from the austenite transformation. For every stage, we deduced the constitutive equations using the principles of thermodynamics and a simple formalism. When the model was defined, we simulated it using the experimental data obtained by analyzing a cube specimen subjected to triaxial traction and thermal load. The obtained results of this simulation reflect the behavior of this kind of materials when thermomechanical load is applied. The main finding of this paper is that the proposed constitutive model can be used to simulate the shape memory effect.
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    Three-dimensional modeling of pseudoelastic effect of the shape memory alloys
    (Journal of the Serbian Society for Computational Mechanics, 2015-01-10) Meddour Belkacem; Zedira Hamma; Djebaili Hamid
    The present work aims to develop a 3D constitutive model to describe pseudoelastic effect on the behavior of memory shape alloys. This phenomenological constitutive model is based on a set of variables: temperature and stress as control variables, and the fraction of the martensite as an internal variable. By using the first and the second principle of thermodynamics and with a simple formalism, we have developed constitutive equations followed by criteria of transformations. This developed model has parameters intended to be determined by a tensile pseudoelastic test. We have introduced an algorithm to simulate the response of the model with respect to experimental data. Three cases were considered: one dimensional, biaxial and triaxial loading.