MOUSSA Zaoui

Ghoul Brahim , Mahdid Noureddine

ETUDE DU COMPORTEMENT MÉCANIQUE ET STRUCTURALE DES SOUDURES A L'ARC ELECTRIQUE SUR DIFFERENTS ACIE

Oualid Bouzid , Chergui Miloud.

Etude et Caractérisation en Flexion Trois Points d'un Bio composite

GHETAI hibtallah , BOUGRABE hassiba

Etude et Caractérisation en traction d’un bio composite

Bachiri A/hamid

Effets des traitements thermiques sur les contraintes résiduelles des joints soudés

BERARDI Ilyes

Etude des caractéristiques mécaniques d’un Joint de soudure

AMEUR Khireddine , OUDINA Yakoub

CARACTERISATION MECANIQUE ET ELECTROCHIMIQUE DE L’ALLIAGE D’ALUMINIUM 2024

4- Guennadi Meriyem

Etude de l'effet de la Température sur la structure de la zone thermiquement affectée

Mechta Ahlam

Contribution à I'am{fsration de la performance des machines -outils à commande numérique

2- Djeddou Omar BALBOUL Salah Eddine , BALBOUL Salah Eddine

Etude mécanique et microstructurale de structure En acier ordinaire E36 soudée par 2 types de soudage (MIG et électrode enrobée

1- BOURAYOU Zohair , BENCHOUCHE Khaled

Etude de l'effet d'une soudure multi-passe sur la structure de la zone thermiquement affectée

messoudi , baghdadi

comportementdynamique d'une poutre

souiah , chouiter

caradt et soudure des pipelines

benhanni

conception d'une unité de maintenance

The objective of this study was to assess the tensile strength of epoxy bio-composites reinforced with palm fibers, both untreated and treated with sodium carbonate NaHCO3 at a concentration of 10% (w/v) for 24 and 96 hours, with varying weight percentages of fibers (15%, 20%, 25%, and 30%). To predict the mechanical performance of the composites, two methods were employed: artificial neural network (ANN) and response surface methodology (RSM). A Box-Behnken RSM design was used to conduct experiments and establish a mathematical model of the bio-composite behavior as a function of the fiber percentage in the samples, specimen cross-section, and treatment time. The ANN forecasts showed consistent expected values for the bio-composite sample behavior, with a correlation coefficient (R2) greater than 0.98 for Young's modulus and 0.97 for stress. Similarly, the correlation coefficients obtained by RSM for the mechanical properties were also highly satisfactory, with an R2 of 0.89 for Young's modulus and 0.87 for stress. Finally, the errors generated by each method (Box-Behnken and ANN) were compared to the experimental results.

Citation

Moussa ZAOUI , , (December 2023), Exploring tensile properties of bio composites reinforced date palm fibers using experimental and Modelling Approaches, Materials Chemistry and Physics, Vol:4, Issue:3, pages:19, DOI: 10.1016/j.matchemphys.2023.128810

The objective of this study was to assess the tensile strength of epoxy bio-composites reinforced with palm fibers, both untreated and treated with sodium carbonate NaHCO3 at a concentration of 10 % (w/v) for 24 and 96 h, with varying weight percentages of fibers (15 %, 20 %, 25 %, and 30 %). To predict the mechanical performance of the composites, two methods were employed: artificial neural network (ANN) and response surface methodology (RSM). A Box-Behnken RSM design was used to conduct experiments and establish a mathematical model of the bio-composite behavior as a function of the fiber percentage in the samples, specimen cross-section, and treatment time. The ANN forecasts showed consistent expected values for the bio-composite sample behavior, with a correlation coefficient (R2) greater than 0.98 for Young's modulus and 0.97 for stress. Similarly, the correlation coefficients obtained by …

Citation

Moussa ZAOUI , , (2024/2/15), Exploring tensile properties of bio composites reinforced date palm fibers using experimental and Modelling Approaches, Materials Chemistry and Physics, Vol:5, Issue:3, pages:15, DOI: 10.1016/j.matchemphys.2023.128810

In the manufacturing industry, Mastercam X5 is a widely used CNC simulation and programming suite that offers high efficiency. It can be easily integrated with the Mastercam model, providing full associativity and seamless single-window integration. The iMachining technology, which uses patented algorithms for specific operations, is a breakthrough in CNC milling tool path technology. It optimizes the tool path, reduces machining time, and minimizes tool wear. The suite enables a wide range of machining operations on various stock objects, making it flexible and versatile. The simulation process allows real-time observation of operations and ensures error-free G-code for physical operation. This paper details the procedures of machining a spur gear from stock material using Mastercam 2D iMachining technology. The simulation process generates automatic Gcodes for practical use in CNC machines. Mastercam simplifies the concept, operation, and importance of using CAM software in modern-day manufacturing industries. It also enables optimization of operational steps and parameter details to save time, cost, and tool lives, improving overall efficiency.

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Mohamed SLAMANI , SAID Zergane , SALAH Amroune , Moussa ZAOUI , Chouki FARSI , , (2023-11-24), G-CODE GENERATION FOR MACHININING SPUR GEAR IN CNC MACHINES USING THE IMACHINING STRATEGY, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:21, Issue:4, pages:49-57, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING

This present investigation reports, for the first time, the properties of the polybenzoxazine bio-based furfurylamine reinforced using the hybrid short carbon fibers and tungsten particles. The results revealed good compatibility between the matrix and the filers using scanning electron microscopy, due to the use of the silane treatment that led to enhanced interfacial bonding. In addition, the mechanical data disclosed that the bending and impact values were respectively increased to 210 MPa and 9 KJ/m ² for the composites containing 20%wt of the short carbon fibers and 20%wt tungsten particles. The hybrid composite shielding properties were evaluated using the cobalt-60 as an irradiation source, and the nuclear results depicted that the half-value length and the tenth-value length were increased as compared to those of the pure polymers. Based on the thermal stability studies, the reinforced hybrid composites also showed excellent thermal resistance.

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Moussa ZAOUI , , (2023), Shielding performances of short carbon fibers and tungsten particles reinforced benzoxazine resin matrix composites, Journal of Reinforced Plastics and Composites, Vol:12, Issue:3, pages:1125-1146, https://www.researchgate.net/publication/369274369_Shielding_performances_of_short_carbon_fibers_and_tungsten_particles_reinforced_benzoxazine_resin_matrix_composites

The presence of a geometric discontinuity in a material reduces considerably its resistance to mechanical stresses, therefore reducing service life of materials. The analysis of structural behavior in the presence of geometric discontinuities is important to ensure proper use, especially if it is about a material of weak mechanical properties such as the polymer. The objective of present work is to analyze the effect of the notches presence of variable geometric shapes on the tensile strength of epoxy-type polymer specimens. A series of tensile tests were carried out on standardized specimens taking into account the presence or the absence of a notch. Each series of tests contains 5 specimens. Two notch shapes were considered, circular (hole) and elliptical. The experimental results in terms of stress-strain show clearly that the presence of notches reduces considerably the resistance of the material where the maximum stress for the undamaged specimen was 41.22MPa and the lowest stress for the elliptical-notched specimen was11.21 MPa. A numerical analysis by the extended finite ele-ment method (XFEM) was undertaken on the same geometric models; in addition, the results in stress-strain form were validated with the experimental results. A remarkable improvement was obtained (generally an error within 0.06%) for strain, maximum stress, Young's modulus and elongation values. An exponential decrease was noted in stress, strain, and Young's modulus in the presence of a notch in the material.

Citation

Moussa ZAOUI , , (2023), EXPERIMENTAL AND NUMERICAL STUDY of the EFFECT OF THE PRESENCE OF A GEOMETRIC DISCONTINUITY OF VARIABLE SHAPE ON THE TENSILE STRENGTH OF AN EPOXY POLYMER, Acta Mechanica et Automatica, Vol:10, Issue:7, pages:https://www.researchgate.net/publication/366822868, https://www.researchgate.net/publication/366822868

The objective of this paper is to study the effect of fibre alignment and treatment of fibres by alkalization on the mechanical properties of natural fibre composites using polyester resin as a matrix. The aim was to examine the performance of a standard laminating resin, used conventionally with glass fibre, and used instead as a matrix for natural fibres. A thorough study of the mechanical behaviour of the composites in flexure and impact is presented here, together with differential thermal analysis (DSC) and dynamic mechanical thermal analysis (DMA).

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Laifa fakhreddine , Moussa ZAOUI , mansour.Rokbi@ univ-msila.dz, ,(2022), THE STUDY OF MATRIX ADHESION BETWEEN PLANT FIBERS AND RISIN,ICENSOS 2022,Konya, Turkey

Le traitement chimique des fibres végétales a un rôle positif dans l'augmentation du processus d'adhésion entre les fibres ,Il est utilisé pour renforcer thermiquement la matrice polymère, qui est un polyester insaturé pour améliorer l'efficacité et les propriétés mécaniques des matériaux composites à travers cette étude, l'effet de traitement chimique utilisant la photo sur la fibre végétale représentée par cynodon dactylon. Dans un deuxième temps, nous avons utilisé un appareil infrarouge des tests chimiques sur divers échantillons de fibres de cynodone dactylon ont prouvé que les traitements chimiques réduisent la les groupes hydroxyles qui filtrent sur les fibres sont de nature hydrophile, ce qui indique que le traitement alcalin réduit la propriété hydrophile des fibres de cynodon dactylon, augmentant le processus de cynodon dactylon la matrice, lors de la formation de composés en raison de la rugosité de surface des fibres et de la solubilité des pectines, des lignines et des cires les résultats en infrarouge ont montré que la structure de la fibre cynodon dactylon a changé après le processus de traitement. Cette modification a été montrée par la disparition de pic à 1647,09 cm-1 après après le traitement alcalin . L'analyse aux rayons X a montré une amélioration de l'indice et de la taille des cristaux cristaux de fibre de cynodon dactylon après traitement. Aussi une augmentation du taux. La cristallisation des composés C94 s'élevait à 30 366% par rapport à C00 qui s'élevait à29 629%.

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SALAH Amroune , Moussa ZAOUI , Saada.Khalissa@univ-msila.dz, ,(2022), The effect of the meshing technique on cracking and its extension in a bio composite plate,ICEANS 2022,Konya/Turkey.

Stress intensity factor solutions for several simple plate geometries loaded by tension and bending are available in parametric form (see e.g. [1], [12]). However, for more general cases involving more complex geometry, numerical methods such as the boundary element method (BEM) or the finite element method (FEM) must be used for evaluation of fracture mechanics parameters. For the last two decades, the FEM has been applied to shear deformable plate bending problems (see e.g. [7], [8], [9]). More recently Viz et al. [13], [14] and Huang et al. [15] computed membrane and bending stress intensity factors for thin plate based on Kirchhoff plate theory. The dual boundary element method (DBEM), has been developed to solve many applications in fracture mechanics e.g. elasticity, thermoelastic, concrete cracking, elastoplastic, stiffened panel, and dynamic fracture mechanics, (see reviews by Aliabadi [2], [3]), and more recently extended by Dirgantara and Aliabadi [4] to solve problems of plates loaded in combine bending and tension. The most important feature of boundary elements is that it only requires discretisation of the boundary rather than the domain. The BEM provides a continuous modelling of the interior since no discretisation of the interior is required, therefore it can give a high resolution of interior stresses and displacements.

Citation

Moussa ZAOUI , ,(2022), Study and numerical simulation of the stress intensity factor of cracked plates,2nd international seminar on industrial engineering and applied mathematics (ISIEAM22),Skikda

The main goal of this study is to characterize natural lignocellulosic fibers extracted from Malva Sylvestris. The experimental approach used is consisted to analyze the morphological, physical, chemical, thermal and mechanical characteristics of Malva sylvistris fibers. The stem anatomy showed that the bark of Malva is rich in fiber cells. Based on ATR-FTIR and X-ray analysis, the obtained results illustrated that the fiber contained mainly cellulose, hemicellulose and lignin. The crystallinity index of fiber is about 55.12 %, which indicated a high cellulose content. The Thermo-gravimetric analysis (TGA) analysis test point out that Malva Sylvestris fibers are thermally stable until 225°C and an apparent activation energy about of 111 kJ.mol−1 was recorded. Tensile strength of Malva fibers is about of 236.64 ± 93.33 MPa whilst its young’s modulus is about of 26.07 ± 5.14 GPa. In view of the dispersion in the obtained experimental results, the latter were analyzed using the Weibull statistical laws with two parameters.

Citation

Moussa ZAOUI , , (2022), Extraction and characterization of novel natural lignocellulosic fibers from Malva sylvestris L., Journal of Composite Materials, Vol:57, Issue:5, pages:2245-2256, Journal of Composite Materials

This paper presents an experimental study conducted to assess the correlation between the intra-axis errors of prismatic axes for CNC machine tools. The validity and reliability of parametric models for the modeling of intra-axis errors (IAEs) of CNC machine tools in the context of indirect calibration are also assessed in this work. Three CNC machine tools with various controllers and guidance technologies were tested using two different measuring instruments. Two predictive models, namely Bézier and B-spline curves, are described and compared for the first time in this work. Both models are experimentally evaluated for accuracy and predictive efficiency using four evaluation criteria and new data sets from the three tested CNC machine tools. Results show a strong correlation between the positioning errors and the pitch and yaw errors for all the tested machines. The results also show that both proposed models are appropriate for the modeling of intra-axis errors, with the B-spline curves coming slightly on top in terms of performance. Moreover, with the same number of control points (n = 5), the two models provide residuals that are lower than the repeatability of the machine for most intra-axis errors tested. This experimental study thus confirms that a Bézier model of degree four and a B-spline model of degree two, both with five control points, are sufficient to represent the intra-axis errors for the tested CNC machine tools.

Citation

Moussa ZAOUI , , (2022), Correlation assessment and modeling of intra-axis errors of prismatic axes for CNC machine tools, The International Journal of Advanced Manufacturing Technology, Vol:1, Issue:20, pages:5093–5115, https://doi.org/10.1007/s00170-022-09074-7

The present investigation aimed to understand the physicochemical properties of the new cellulosic fiber extracted from the bark of Silybum marianum (SM), in view of using it as a potential reinforcement for polymer composites. The morphological and anatomy, physical, thermal and mechanical properties of fibers were firstly discussed in this paper. The Silybum marianum fibers (SMF) were characterized by scanning electron microscopy, Fourier transform infrared, thermogravimetric analysis (TGA), optical microscope, X-ray diffraction (XRD), and single fiber tensile test. The average Young’s modulus and the breaking stress data presented by the fibers are 15.97 GPa and 201.16 MPa, respectively. XRD reveals the presence of cellulose with a crystallinity index of 45%. Thermal stability (250°C) and maximum degradation temperature (357.72°C) of the SMF are established by the thermogravimetric analysis. An analysis of the mechanical properties was carried out on a population of 35 samples using Weibull statistics with two and three parameters.

Citation

Moussa ZAOUI , , (2022), Investigation of mechanical, physico-chemical and thermal properties of new fiber from Silybum Marianum bark fiber., Journal of Composite Materials, Vol:56, Issue:14, pages:2227–2238, DOI: 10.1177/00219983221090020

Manuscripts should Quarries and mines that exploit hematite ore Fe2O3 usually have a large quantity of waste rock with low iron content, stored in the slag heaps of quarries or mines without enrichment. This work consists in finding solutions to this product to make it more or less usable in industries. As an example of use, the Fe2O3 content in the clinker after grinding and homogenisation varies between 1 and 8%. Africa. After chemical and mineralogical analysis of the whole product, the large percentage of existing chemical elements is the hematite ore Fe2O3 which has a low iron concentration. To improve its iron content, it must be treated by chemical and hydro mechanical processes that are economically viable. Since it remains in the product heap, it will be degraded in the open air of the quarry by atmospheric chemical reactions. A certain amount of this stockpile is sampled at different locations in a heap to distinguish the chemical elements of the dominant product. The search for good enrichment techniques of these materials after their homogenisation led us to choose among the main separation operations, those based on the difference of densities obtained by suspension in granulated Ferro-solutions composed of silicon and magnetite. From the results of the gravimetric separation, three fractions were obtained: an iron-rich fraction with a content > 45%; a medium fraction with an iron content of 45 to 10%; an iron-poor fraction <10%. The two fractions rich in iron and poor in iron are eliminated at the beginning of the enrichment operations. According to the magnetic properties analysis, as a semi-separated product, the medium iron fraction will undergo a new enrichment sequence by high magnetic field separation.

Citation

Moussa ZAOUI , , (2021), EVALUATION OF MATERIALS FROM THE EXCAVATION OF THE OUENZA HEMATITE DEPOSIT (NORTH-EAST ALGERIA) BY GRAVIMETRIC ENRICHMENT, Nat. Volatiles & Essent. Oils,, Vol:8, Issue:4, pages:11529-11537, editor@nveo.org

Quarries and mines that exploit hematite ore Fe2O3 usually have a large quantity of waste rock with low iron content, stored in the slag heaps of quarries or mines without enrichment. This work consists in finding solutions to this product to make it more or less usable in industries. As an example of use, the Fe2O3 content in the clinker after grinding and homogenisation varies between 1 and 8%. Africa. After chemical and mineralogical analysis of the whole product, the large percentage of existing chemical elements is the hematite ore Fe2O3 which has a low iron concentration. To improve its iron content, it must be treated by chemical and hydro mechanical processes that are economically viable. Since it remains in the product heap, it will be degraded in the open air of the quarry by atmospheric chemical reactions. A certain amount of this stockpile is sampled at different locations in a heap to distinguish the chemical elements of the dominant product. The search for good enrichment techniques of these materials after their homogenisation led us to choose among the main separation operations, those based on the difference of densities obtained by suspension in granulated Ferro-solutions composed of silicon and magnetite. From the results of the gravimetric separation, three fractions were obtained: an iron-rich fraction with a content > 45%; a medium fraction with an iron content of 45 to 10%; an iron-poor fraction <10%. The two fractions rich in iron and poor in iron are eliminated at the beginning of the enrichment operations. According to the magnetic properties analysis, as a semi-separated product, the medium iron fraction will undergo a new enrichment sequence by high magnetic field separation.

Citation

Moussa ZAOUI , ,(2021), EVALUATION OF MATERIALS FROM THE EXCAVATION OF THE OUENZA HEMATITE DEPOSIT (NORTH-EAST ALGERIA) BY GRAVIMETRIC ENRICHMENT,4rd INTERNATIONAL SCIENTIFIC AND TECHNICAL CONFERENCE,PETROȘANI, ROMANIA

This article focuses on the design and manufacture of mechanical parts that have complicated shapes using the technique of reverse design using a scanner or an MMT for data acquisition in the form of a point cloud, using CAD software (CATIA). The digital model created is used for a virtual representation of the final product. Then we get the physical model on a 3D printer (also called additive manufacturing process) for later use in sand moulds. To have the imprint in the sand mould, we go through the fusion of the physical model (part). The use of this technique in the industry, allows us to save a lot of time in terms of model preparation and simple to implement, especially if it is mechanical parts that do not have a definition drawing, or they are worn out, then structural analysis was applied on the model using FE based software and tools to prove the quality of the product. Von Mises equivalent strains and stresses were predicted and decreased with increasing areas and honeycomb thickness. The objective of this article is to give an overview of this relatively modern technology and its various applications.

Citation

Moussa ZAOUI , , (2021), Manufacturing of rapid prototypes of mechanical parts using reverse engineering and 3D Printing, Journal of the Serbian Society for Computational Mechanics, Vol:15, Issue:1, pages:167-176, https://www.researchgate.net/publication/359506574

This study concerns the wear behaviour of metal couples used in industry, particularly in mechanical sliding systems (numerically controlled machine tools). In general, the nature of the materials of the parts of these systems which are in contact and move relatively, are medium carbon steels, thanks to their good mechanical and tribological properties. The present work aims to study, the dry sliding wear of the contact surface of the pin (machine slide) against the contact surface of a disc (machine groove) and the damage induced on the worn track. The pin is AISI 1038 and AISI 1045 steel, the disc is AISI 1055 steel. The tribological tests were carried out on a pin-disc tribometer, in an atmospheric environment. The wear of the pins being evaluated by weighing and studied according to the hardness of the pin with the variation of the normal load applied. The discussion of the results is based on SEM observations and EDS analyzes of worn surfaces and interfacial phenomena produced by dynamic contact. The results obtained indicated the influence of the applied load and the hardness on the wear of the pin and therefore on the tribological behaviour of the worn surfaces.

Citation

Moussa ZAOUI , , (2021), Experimental investigations of surface wear by dry sliding and induced damage of medium carbon steel, Diagnostyka, Vol:22, Issue:2, pages:3-10, https://doi.org/10.29354/diag/134116

The effect of a pre (before) and post (after) heating welding treatment on the microstructure and mechanical properties of the scrap blades made of cast INC738LC superalloy is the main goal of the present investigation. The filler used in TIG welding was a INC 625 solution hardened superalloy as the proposed solution for hot cracking of the INC738LC cast superalloy in literature. The TIG welding was processed with respect to the constantly optimized parameters (current, voltage, speed, gas flux rate and number of passes) to make a mechanical properties comparison between the as received superalloy and the welded superalloy with heat treated specimens. The characterization techniques employed in this study are hardness measurements, tensile tests, optical microscopy and scanning electron microscopy. We found that the proposed preheating improves the TIG welding of the INC 738 LC superalloy specimens and the post welding heat treatment enhances its mechanical properties.

Citation

noureddine MENASRI , Cherif saib , Moussa ZAOUI , SALAH Amroune , H. Gauss, , (2020), EFFECT OF PRE-POST TIG WELDING HEAT TREATMENT ON CAST NI SUPERALLOY, ANNALS OF DUNAREA DE JOS UNIVERSITY OF GALATI, FASCICLE XII, WELDING EQUIPMENT AND TECHNOLOGY, Vol:31, Issue:, pages:35-42, Galati University Press

The effect of a pre (before) and post (after) heating welding treatment on the microstructure and mechanical properties of the scrap blades made of cast INC738LC superalloy is the main goal of the present investigation. The filler used in TIG welding was a INC 625 solution hardened superalloy as the proposed solution for hot cracking of the INC738LC cast superalloy in literature. The TIG welding was processed with respect to the constantly optimized parameters (current, voltage, speed, gas flux rate and number of passes) to make a mechanical properties comparison between the as received superalloy and the welded superalloy with heat treated specimens. The characterization techniques employed in this study are hardness measurements, tensile tests, optical microscopy and scanning electron microscopy. We found that the proposed preheating improves the TIG welding of the INC 738 LC superalloy specimens and the post welding heat treatment enhances its mechanical properties.

Citation

Moussa ZAOUI , , (2020), Effect of Pre-post TIG Welding Heat Treatment on Ni Superalloy, Annals of Dunarea de Jos University of Galati, Vol:31, Issue:8, pages:35-42, DOI: 10.35219/awet.2020.05

This work is a contribution to the study of the rigidity of rotational friction welding of cylindrical specimens made on a parallel lathe. We performed welding of three combinations of parts: steel / steel, aluminium / aluminium and steel / aluminium according to three numbers of rotations of the spindle (900, 1250 and 1800 rpm). To control the rigidity and quality of these assemblies, tensile tests are used followed by ultrasonic testing to ensure that the tips are welded and that there are no internal defects. Hardness profile of the welded zone according to the welding parameters was obtained. Metallographic observations have detected the profile of the various zones welded and affected thermally. The results of the mechanical tests showed that a rotation speed of 1250 rpm can produce a very good weld, with other parameters kept constant.

Citation

Moussa ZAOUI , , (2020), Characterization and mechanical behaviour of similar and dissimilar parts joined by rotary friction welding, Engineering Solid Mechanics, Vol:9, Issue:1, pages:23-30, https://www.researchgate.net/publication/341990368

In this work, short carbon fibers were first surface-grafted with various amounts of epoxy terminated hyperbranched polymers, and then utilized as reinforcing phases in various thermosetting polymeric blends composed of dicyanate ester of bisphenol-A (DCBA) and bisphenol-A based benzoxazine (BA-a) resins. The Fourier Transform Infrared Spectroscopy (FTIR) test validated the surface modification of the short fibers and confirmed the reaction between the coated fibers and the DCBA/BA-a resin blend. The composites’ mechanical properties were evaluated and the obtained results revealed that at the maximum fiber loadings, the bending strength and modulus as well as the impact strength were identified to be 217.8 MPa, 7.1 GPa, and 18.4 kJ/m2, respectively. The scanning electron microscope (SEM) analysis established that the enhancements were basically attributed to the good dispersion and adhesion of the coated carbon fibers within the resin matrix.

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Moussa ZAOUI , , (2019), Structural, morphological and mechanical properties of hyperbranched polymers coated carbon fibers reinforced DCBA/BA-a composites, Composite Composite Interfaces …, 2019 -, Vol:15, Issue:14, pages:14, Taylor & Francis

In this article we would like to show an application of the theory of optimal control to the resolution of an aerodynamic problem. This problem consists in determining the shape of a solid body, moving in a gaseous medium with minimal resistance. This problem is tackled by Newton in his work "The mathematical principles of natural philosophy" and the study of its resolution is a problem always present in modern supersonic aerodynamics especially for the construction of flying machines at high altitude with very large speeds.

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Moussa ZAOUI , ,(2019), An application of the theory of optimal control for the resolution of an aerodynamics problem,ICCMAS2019,turquie

Mining enterprises use many steel pipes for pumping sludge from ore dressing waste. These pipes are often repaired by welding. This work requires a lot of time and high quality connections. In this re-gard, the research below have been performed. The macrographic examinations enabled us to conclude that, the weld bead has a satisfactory penetration lacking defect. They confirm the visual examinations which reveals a regular cord and of beautiful aspect. It is noticed that the heat treatment does not change the mac-rographic structure except on the level of dimensioning of the grains. This obliges someone to see the size and the nature of the grains by micrographic examinations. The zone of connection is the seat of a thermal contribution in short and rather important conditioning the enlargement of the grains and the formation of an acicular structure, It is thought that the zone of overheating is the seat of structures which have the reduced plastic properties of the welding and weaken the structure slightly. The structure of our product after welding is pri-marily ferritic with some small islands or beaches of pearlite (per-centage of weak carbon). External master keys (4th and 5th)

Citation

Moussa ZAOUI , ,(2019), Improvement of welded pipe joints for mining equipment,Improvement of welded pipe joints for mining equipment,PETROȘANI, ROMANIA

The residual stresses in a component or structure are stresses caused by incompatible internal permanent strains. They may be generated or modified at every stage in the component life cycle, from original material production to final disposal. Welding is one of the most significant causes of residual stresses and typically produces large tensile stresses whose maximum value is approximately equal to the yield strength of the materials being joined, balanced by lower compressive residual stresses elsewhere in the component.

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Moussa ZAOUI , ,(2018), experimental study of ductil fractur in weldments,ICAME,Turquie

Le moyen non destructif de mesure des contraintes résiduelles le plus répandu est la diffraction des rayons-X (DRX). La détermination des contraintes résiduelles par les méthodes de diffraction est basée sur la mesure des angles pour lesquels l’intensité diffractée est maximale lorsqu’une structure cristalline est irradiée par des rayons X. A partir de ces angles, la loi de Bragg donne la distance d(hkl) entre les plans du réseau cristallin dont la valeur dépend du champ de contrainte au sein du matériau étudié.

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Moussa ZAOUI , ,(2018), similation of motion errors from circular tests for CNC machines predictive maintenance programs,ISIEAM,skikda

This study was performed to evaluate fracture toughness in heat-affected zone (HAZ) of X80 pipes welded using gas metal arc welding (GMAW). The J integral of Rice, was used to analyze the harmfulness of defects in welds. Mechanical properties such as strength, work-hardening and ductility in the HAZ were also characterized in order to conduct numerical analysis on the fracture toughness by a damage model. The numerical simulation of ductile tearing performed using the Rice-Tracey model based on the growth of voids, has highlighted the importance of parameters related to the model; in the case of a rate over matching Importantly. . Keywords: : Weldments, X80 steel, Ductile fracture, local approach,

Citation

Moussa ZAOUI , ,(2018), Etude ntaleeerimexp de la dechirure ductile des aciers à haute résistance pour gazoducs,ICAMRE,Boumerdas

The aim of this study is to analyze the effect of different geometries and sections on the mechanical properties of epoxy specimens. Five tensile tests were carried out on three types of series. The experimental results obtained were 1812.21 MPa, 3.90% and 41.91 MPa for intact specimens, 1450.41 MPa, 2.16% and 21.28 MPa for specimens with hole and 750.77 MPa, 2.77% and 11.89 MPa for specimens with elliptical -notched for Young's Modulus , strain and stress respectively. In addition, the experimental results indicated that the mechanical properties of both (Young's Modulus value and stress value) were higher in an intact specimen. Afterwards, the nonlinear functional relationship of input parameters between epoxy sample geometries and sections was established using the response surface model (RSM) and the artificial neural network (ANN) to predict the output parameters of mechanical properties (Young's Modulus and stress). In addition, the design of experiment was developed by the Analysis of the Application of Variance (ANOVA). The results showed the superiority of the ANN model over the RSM model, where the correlation coefficient values for the model datasets exceed ANN (R2 = 0.984 for Young's Modulus and R2 = 0.981 for the stress).

Citation

Moussa ZAOUI , , (01.10.2023), Prediction of mechanical behavior of epoxy polymer using Artificial Neural Networks (ANN) and Response Surface Methodology (RSM), Frattura ed Integrità Strutturale, Vol:11, Issue:66, pages:191-206, DOI: 10.3221/IGF-ESIS.66.12

The field of automation in tool path generation for a 3-axis CNC machine is experiencing significant growth in the computer-aided manufacturing sector. Current research efforts are focused on improving the efficiency and precision of this process. To achieve this, new technologies are being explored to enable a more advanced and automated generation of tool paths. In this article, we will examine the current state of research concerning automated tool path generation on a 3-axis CNC machine using Matlab programming tools. As an example, we will consider a complex butterfly shape derived from a mathematical function that allows drawing the 2D geometric form. At the end of the process, a G-code is automatically generated for future use in the CNC machine. The obtained results are highly encouraging, which provides further motivation for continuing research in this direction.

Citation

Moussa ZAOUI , , (01.1.2024), INVESTIGATION FOR THE AUTOMATED GENERATION OF TOOLPATHS ON A 3AXIS CNC MACHINE, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:22, Issue:1, pages:12, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, VOL.22, ISSUE 1/2024