génie Mécanique

URI permanent de cette collectionhttps://dspacee.univ-temouchent.edu.dz/handle/123456789/765

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Simulation de la propagation de fissures Dans les structures sous chargement cyclique
(2026) MECELLEM MOHAMED ABDELLAH; ELRARBI SARA; CHAMA Mourad
Les bimatériaux sont largement utilisés dans différences branches de la technologie comme la mécanique, l’électronique et l’électrotechnique parce qu’ils sont constitués de deux matériaux dont les propriétés physiques et mécaniques sont totalement différentes. Le comportement en ruptures des matériaux hétérogènes nécessite des connaissances approfondies et le domaine de recherche reste complexe et ouvert. Le travail ainsi présenté a pour objectif d’analyser numériquement par la méthode éléments finis la propagation d’une fissure initiée dans la céramique et au voisinage proche de l'interface sous l’effet d’un chargement cyclique. L'étude porte sur l'analyse d’un modèle géométrique bidimensionnel, est une poutre en flexion, elle est composée de deux matériaux, alumine contient de teneur d’époxy avec et sans gradient au voisinage proche de l’interface. Une étude comparative a été faite en comportements élastiques. Plusieurs facteurs ont été mis en évidence tels que la résistance de la fatigue de la fissure et sa déviation dans la céramique. Abstract Bimaterials are widely used in various branches of technology, such as mechanics, electronics, and electrical engineering, because they are composed of two materials with completely different physical and mechanical properties. The fracture behavior of heterogeneous materials requires in-depth knowledge, and the research field remains complex and open. The work presented here aims to numerically analyze, using the finite element method, the propagation of a crack initiated in the ceramic and in the immediate vicinity of the interface under the effect of cyclic loading. The study focuses on the analysis of a two-dimensional geometric model, a beam in bending, composed of two materials: alumina containing epoxy with and without a gradient in the immediate vicinity of the interface. A comparative study was conducted on elastic behavior. Several factors were highlighted, such as the fatigue resistance of the crack and its deflection in the ceramic..
Techno-Economic Studty of Pumped Thermal Energy Storage
(2026) Mohamad El-Osman; Remlaoui Ahmed
As renewable energy continues to play an increasingly important role in modern power systems, the need for energy storage technologies capable of delivering large amounts of energy over extended periods is becoming more critical. Pumped Thermal Energy Storage (PTES) has emerged as a promising solution that stores electrical energy in the form of thermal energy and converts it back into electricity when required. This study focuses on the techno-economic assessment of a Brayton-cycle PTES system under the climatic conditions of Ain TEMOUCHENT, Algeria. The study employed the System Advisor Model (SAM) to simulate and evaluate the technical and economic performance of the proposed system. The simulation results were used to assess the thermodynamic performance, energy storage capacity, thermal losses, and overall economic feasibility of the PTES system. In addition, a parametric analysis was conducted to investigate the effects of storage duration and hot storage temperature on system performance. The results demonstrate that PTES is a promising technology for long-duration energy storage and offers significant technical and economic benefits for the integration of renewable energy into modern power systems.
Analyse tridimensionnelle de l'écoulement dans un échangeur bitube en présence d'un nanofluide hybride
(2026) MADANI Mohamed Abd El Ghafour; LOURMIL Souheyla; BENZENINE Hamidou
This work presents a thermal and numerical study of a double-tube heat exchanger equipped with longitudinal fins mounted on the outer surface of the inner tube using ANSYS Fluent software. The main objective of this study is to analyze the influence of flow rate, hybrid nanofluid type, and nanoparticle volume concentration on the thermal performance of the heat exchanger. The longitudinal fins were used to increase the heat exchange surface area and enhance heat transfer efficiency. After creating the geometry, mesh, and boundary conditions, several numerical simulations were carried out to evaluate the thermal behavior of the fluids and the evolution of outlet temperatures. The obtained results show that the variation of flow rate, hybrid nanofluid type, and concentration directly affects heat transfer efficiency and outlet temperatures. This study highlights the importance of numerical simulation in the analysis and optimization of heat exchangers.
Influence de la forme du pliage sur la résistance des tôles
(2026) BENMENDIL Rizlane Meriem; BENMECHTA Mama Imene; El AHMAR kadi
This research focuses on the impact of bend geometry on the mechanical properties of sheet metal used in industrial structures. The study compares three main configurations: plain sheet metal, U-bent sheet metal, and V-bent sheet metal. Through numerical simulations performed using Abaqus and by imposing realistic boundary conditions, the results show that bent shapes significantly improve stiffness and reduce deformation compared to flat sheets. This study highlights that optimizing the bend shape is an effective solution for strengthening sheet metal, improving its stability, and meeting the industry's increasing demands for reliability and performance.
Short-Term Prediction of the Photovoltaic Production of a Solar Farm Using Artificial Intelligence and Machine Learning
(2026) GHALEM Mohammed; HADDOU Zakarya Mohammed Nadir; DORBANE Abdelhakim
This thesis presents a short-term prediction study of the photovoltaic power production of a solar farm using Artificial Intelligence and Machine Learning techniques. Given Algeria's exceptional solar potential and the growing integration of photovoltaic systems into the national grid, accurate forecasting of PV output has become essential for grid stability and energy management. The study employs a data-driven regression approach using meteorological and operational data, including solar irradiance, ambient temperature, relative humidity, wind speed, wind direction, and sea-level pressure, as input features to predict the target variable Power_PACE. Five Machine Learning models were developed and compared: Linear Regression, Random Forest, Gradient Boosting, XGBoost, and CatBoost. After preprocessing and feature engineering in Python, each model was trained on historical data and evaluated on a held-out test set using MAE, RMSE, and R2 metrics. Results show that Linear Regression achieved the highest coefficient of determination (R2 = 0.9777) with the lowest RMSE (5,953 W), reflecting the dominant linear relationship between solar irradiance and power output in the summer dataset. Random Forest ranked second with the lowest MAE (4,232 W), demonstrating strong robustness and interpretability. SHAP analysis confirmed Solar_Mean as the primary predictor, followed by ambient temperature and hour of day. The findings demonstrate that even classical Machine Learning models can achieve high forecasting accuracy when solar irradiance is the dominant driver, while ensemble methods such as Random Forest offer a more reliable choice for real-world deployment due to their robustness to noisy data and nonlinear behavior.
Étude, conception et analyse des performances d’un compresseur centrifuge
(2026) AGHA Chaima; HARCHOUCHE Zine el abidine
This study focuses on the modeling, simulation, and analysis of the aerodynamic performance of a centrifugal compressor using computational fluid dynamics (CFD) with ANSYS CFX software. A numerical model was developed to solve the conservation equations for mass, momentum, and energy, while incorporating appropriate physical models, including the k-ω SST turbulence model and rotational conditions. In a second step, a multi-response optimization approach was implemented to improve compressor performance. This optimization aims simultaneously to maximize the compression ratio and isentropic efficiency while reducing power consumption. After presenting the desirability function method, the optimization was applied to the response surfaces of the three parameters studied using Design-Expert 13 software. Finally, analysis of the optimal profile, the interactions between the parameters, and the robustness of the model allowed for the identification of an optimal operating point, validated under near-real-world conditions.
Étude numérique de la position du matériau à changement de phase (MCP) dans une brique pour l'amélioration de l'inertie thermique des bâtiment
(2026) BENMANSOUR Khadidja; RAMDANI Nour elhouda; NEHARI Taieb
This dissertation presents a numerical study of the integration of phase change materials (PCM) into the cavities of a hollow fired-clay brick, aiming to improve the thermal inertia of buildings in hot climates. The numerical model developed with Ansys-Fluent is based on the enthalpy-porosity method to simulate melting and solidification phenomena. Six configurations were studied by varying the PCM type (capric acid, RT-27, RT-42) and its position relative to air and EPS insulation. Results show that capric acid directly integrated into all brick cavities offers the best thermal performance, with a significant reduction in incoming heat flux and maximum time-lag of the temperature peak. Any intermediate air layer severely degrades efficiency, while the PCM/EPS combination proves superior to EPS/PCM.
Application de la méthode d’homogénéisation numérique pour la prédiction du comportement élastique d’un empilement de couches minces
(2026) OUAGUEF Ghizlane; BENMEDJAHED Khadidja; BELHENINI Soufyane
This work presents a numerical study dedicated to the application of the numerical homogenization method to predict the elastic behavior of a thin-film stack (metallic and dielectric) used in microelectronic and micro-electro-mechanical systems (MEMS), providing an efficient alternative to full heterogeneous modeling which is computationally expensive and time-consuming. The methodology is based on modeling a 5-layer Representative Volume Element (RVE) alternating between conductive materials (AlCu or Platinum Pt) and a dielectric insulator (USG), while including a parametric study on layer thickness variations. Simulations were performed using Abaqus software coupled with the EasyPBC plugin to apply periodic boundary conditions and identify effective elastic constants via virtual tensile and shear tests. To validate the homogenized model, a quantitative comparison was conducted against the reference heterogeneous model under 3-point and 4-point bending loads. The results demonstrate an excellent macroscopic agreement between both models regarding global deflection and stiffness predictions, while showing that increasing the metallic layer thickness enhances structural rigidity but amplifies interfacial stresses. However, despite the drastic computational efficiency of the homogenization method, the study highlights its limitations related to the stress-smoothing effect, which masks local stress concentrations at the material interfaces. Finally, this research opens future perspectives regarding the incorporation of elastoplastic laws for metals, cohesive zone modeling (CZM) for interfacial damage, and the consideration of manufacturing-induced residual thermal stresses.
Etude énergétique des cycles de puissance à changement de phase
(2025) DAMOU, KOUIDER; MEDJIDI, AYMEN IMAD EDDINE; HARCHOUCHE, Zine el abidine
The energy analysis of phase-change power cycles aims to analyze and optimize the heat exchanges and energy transformations associated with the vaporization and condensation of the working fluid, with the objective of improving the overall efficiency and performance of thermodynamic systems such as Rankine cycles. Organic Rankine Cycles (ORC), which are variants of traditional steam Rankine cycles using water, are employed when the heat source available for mechanical power generation is of low or medium temperature. The process was modeled using the DWSIM software and validated through a series of simulations. A sensitivity analysis was then conducted to assess the impact of variations in operating conditions—specifically steam flow rate, inlet temperature, and pressure—on the efficiency of the Rankine reheat cycle. The effect of the working fluid’s phase changes on cycle VI performance was also investigated. For optimization, the Design-Expert software was used, applying a Central Composite Design (CCD) combined with quadratic, linear, and 2FI regression models. Three input parameters were considered: steam mass flow rate, inlet temperature, and pressure. The responses analyzed were the isentropic efficiency and the net power output of the cycle. Consequently, this study adopts an integrated approach combining process simulation using DWSIM and optimization via the Response Surface Methodology (RSM), with the goal of simultaneously improving power output and overall efficiency of the Rankine reheat cycle.
Comportement dynamique d’un tube fonctionnellement gradué
(2025) BOUHAMIDI, AMIRA; TALHA, Zakaria; SAIMI, Ahmed
In this thesis, an in-depth numerical study is conducted on the free vibrational analysis and static bending of tubes made from functionally graded materials (FGM), taking into account porosity properties under the influence of thermal variations. The power-law is used to model the gradation of FGM materials, while a nonlinear temperature distribution is adopted to better reflect real-world conditions. This work is based on two classical beam theories: Euler-Bernoulli theory and Timoshenko theory, allowing for a comparative analysis of mechanical behavior. The equations of motion are derived by applying Lagrange’s principle through two distinct methods: a numerical method based on classical finite elements and an analytical approach using the Galerkin method. The natural frequencies are then calculated by solving the eigenvalue problem, considering various influencing parameters such as the FGM tube geometry, the power-law index associated with material gradation, temperature variations, porosity index, and different combinations of FG materials. This research aims to provide a deeper understanding of the vibrational and mechanical performance of FGM structures in complex environments.
Analyse numérique tridimensionnelle du comportement thermique d'un échangeur de chaleur à tube spiralé équipé de chicanes
(2025) MAGHRAOUI, Fatna Loudjine; BOUHASSIDA, Souad Nourelhane; BENZENINE, Hamidou
Heat exchangers are essential engineering devices widely used across various industrial sectors to facilitate heat transfer between two fluids In this study, a shell-and-tube heat exchanger is taken as the reference model. A numerical investigation was carried out using ANSYS Fluent software on two spiral tube heat exchanger configurations with identical outer dimensions. The first configuration features a simple spiral tube design, while the second includes five baffles, added to enhance heat transfer performance. The study focuses on the variation of outlet temperature with respect to fluid velocity, with a comparative analysis between the two models.
Analyse de l'influence de la rigidité des patchs composites sur la résistance en fatigue des plaques réparées en alliage d'aluminium 6061-T6
(2025) BENTOUILA, Mohammed Said; BOURAS, Reda mohamed Riad; Bahram, Kaddour
The durability of materials subjected to repeated cyclic loading is a major challenge, particularly in industrial sectors. Composite patch repairs are used to extend their service life, but their effectiveness depends on factors such as patch rigidity, overload ratio, and adhesive properties. This study explored the influence of repair patch rigidity, cyclic overload, and adhesive types on the fatigue life of the 6061-T6 aluminum alloy. Simulations were conducted with patches of varying rigidity (80%, 100%, 120%, 140%), overload ratios ranging from 1.5 to 3.5, and three different adhesive types (Graphite/Epoxy, Boron/Epoxy, Glare). The main objective was to measure the impact of these factors on crack propagation rate and the lifespan of the repaired material. The results show that a patch with 140% rigidity (relative to the substrate) delays cracking the most, increasing the lifespan by 40%. A moderate overload ratio (t=2.5) slows crack propagation by 25%, while excessive overload (t=3.5) prematurely damages the repair. Finally, the Graphite/Epoxy adhesive stands out, improving durability by 30-50% compared to other tested adhesives due to its resistance to delamination. These insights guide the development of optimized repair strategies for demanding industrial environments.
Etude technico-économique d’un système de ventilation solaire photovoltaïque
(2025) KADRI, Mohamed Aimen; KADID, Abderrahmane Farouk; HADJ, Abderrahmane Fayçal; BENSAAD, bourassia
Solar ventilation represents an innovative and sustainable solution for improving thermal comfort and indoor air quality while reducing building energy consumption. This thesis explores solar ventilation as an innovative solution to improve thermal comfort and indoor air quality while contributing to energy efficiency in buildings. It presents the basic principles of ventilation, its different types (natural, mechanical, and hybrid), before focusing on solar ventilation and its main components: fans, photovoltaic panels, batteries, charge controllers, etc A dimensioning methodology is developed through a concrete case study in a classroom in Algeria, allowing for the assessment of air flow requirements, fan power, and the design of an adapted photovoltaic installation. Finally, a market study and a business model are proposed for the creation of a startup specializing in the sale and installation of solar ventilation systems. The analysis shows that this technology is not only enviro
Conception et analyse de prothèse de hanche de type spacer
(2025) MEHALLI, MOUHAMED ABDELRAHMEN; BELHADJI, MEHDI; SALAH, Hichem
This thesis focuses on the mechanical study of a temporary hip prosthesis, known as a spacer, used primarily in two-stage treatments for periprosthetic infections. Typically made of bone cement (PMMA), this type of implant exhibits low mechanical strength, which can compromise its stability and durability, particularly in the absence of internal reinforcements. In this context, the work aims to analyze and compare three configurations of spacer femoral stems : one without reinforcement, one with a cylindrical reinforcement, and one with a flat reinforcement. The approach adopted combines 3D geometric modeling using SolidWorks and mechanical simulation using the finite element method via Abaqus. The prosthesis is inserted into a bone environment composed of cancellous bone surrounded by cortical bone, modeled to faithfully reproduce anatomical reality. The applied stresses reproduce physiological forces, including axial load due to body weight and abductor muscle strength. The results are analyzed for several stress components (σXX, σYY, σZZ, σXY, σXZ, σYZ, and Von Mises) on the outer and inner surfaces of the stem, distinguishing three functional zones: proximal, medial, and distal. The analyses show that the unreinforced configuration generates high stresses, particularly in the proximal zone. The cylindrical reinforcement partially reduces these stresses, while the flat reinforcement allows for a significant improvement in force distribution and a significant reduction in critical stresses, particularly in tension and shear. This thesis thus demonstrates the importance of a reinforced spacer design to ensure its mechanical performance and clinical safety. It highlights the value of digital tools for optimizing the design of medical devices and paves the way for more robust temporary prostheses, possibly 3D printed or reinforced with composite structures.
Endommagement des joints soudés
(2025) AID Yousra, Rihem; BERAKNE, Khadidja; Dr ELAHMAR Kadi, Adel
Welding is a very well-known assembly process in the mechanical industry, for this reason various studies and research are interested in this area, the variation of the processes has allowed researchers to deepen their research into the rupture and damage of welded structures. To this end, the aim of our thesisis the study of damage to welded joints of A48-AP steel. The objective of this manuscript is to highlight the influence of the heterogeneity of the microstructure of the welded joints on the mechanical behavior of the structure, as well as a numerical simulation by finite elements is applied on notched axisymmetric specimens to model the effect of heterogeneity on the damage of the welded structure.
Wind power prediction using Machine Learning models: A comparative study
(2025) Amar Bensaber Houssam, Amar Bensaber Houssam; Haddou Benderbal Mohammed Amjed, Haddou Benderbal Mohammed Amjed
This study addresses the challenge of integrating wind energy into power systems due to its natural variability by employing machine learning techniques to predict wind power generation using real field data from a Senvion MM82 wind turbine in France. Five algorithms—Random Forest, Decision Tree, XGBoost, CatBoost, and Linear Regression—were evaluated using standard performance metrics, with Linear Regression emerging as the most accurate. The research highlights the critical role of data preprocessing, feature engineering, and the inclusion of meteorological and operational parameters, ultimately demonstrating the potential of machine learning to enhance forecasting accuracy, support grid integration, and improve the reliability of renewable energy systems.
Impact du soudage sur les propriétés mécaniques des joints en C48.
(2025) SIBACHIR, Abderrahmane; BENDAHMANE, Youcef; Dr. CHERIET Nour EL HOUDA, Adel
This study analyzes the mechanical behavior of a welded assembly by combining finite element modeling (FEM) under static loading (via ABAQUS) and cyclic loading (via AFGROW). The objective is to identify critical zones—especially the heat-affected zone (HAZ)—and assess their impact on mechanical strength. The results reveal that the HAZ exhibits stress concentrations, plastic deformations, and damage significantly higher than those in the base metal, making it the most vulnerable region. Localized stress gradients were also detected there, confirming the influence of microstructural heterogeneities induced by welding. These observations emphasize the importance of optimizing welding design and process to mitigate stress concentrations in the HAZ, thereby improving the durability of welded structures.
Etude le bilan frigorifique d’une chambre à température négative
(2025) Bensaad, Mounia; DR. Nehari Tayeb; Benghorzi, Adel
In this we did a study of a cold room at a negative temperature, which allowed us to understand the importance and the necissitance to take into account all the elements that intervene in the study and dimension of a cold room, and we cited the components of the cold room. Also the study is used to choose the best refrigerant that works in a negative temperature
Fabrication par matériaux composites d'un échantillon de la coque d'une embarcation destinée aux petits métiers.
(2025) BENMANSOUR, Nabil; Abdelkrim, SIDI IKHLEF; DR.Amine Beloufa
As part of our PFE STARTUP project, we manufactured a boat hull sample using composite materials (E- type Mat fiberglass and polyester resin). We performed several mechanical tests to measure the permeability, hardness, and Young's modulus of our specimens. We also measured the chemical properties to determine the glass transition temperatures (Tg, Tc, Tf ). We aimed to demonstrate that our boat hull sample made from composite materials possesses the mechanical and chemical properties recommended in the maritime safety and boat construction specifications and standard regulations.
Optimisation d’un système solaire photovoltaïque pour la Médiathèque de l’université de Ain-Temouchent à l’aide de PVSYST
(2025) Benmedjahed, Hayet; Kribi, Souad; DR.Berrezoug Hiba Imane
This thesis focuses on the design and sizing of a photovoltaic system intended to supply electricity to the media library of the University of Aïn Témouchent. The study begins with a general overview of renewable energy sources, with a particular emphasis on photovoltaic (PV) energy and the operating principle of solar cells. A detailed description of the various components of a PV system—such as solar panels, batteries, and inverters—is then provided. To assess the system's performance, simulations were carried out using the PVSYST software. These simulations allowed us to generate production curves and analyze key indicators such as the annual specific yield and overall system efficiency. The study also considers meteorological conditions at the installation site, including solar irradiance and ambient temperature, which directly affect the system‘s performance. Finally, an economic assessment of the project was conducted to evaluate its feasibility and profitability. This work thus aims to demonstrate the technical and economic viability of using photovoltaic solar energy in the university sector.

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