Browsing by Author "Bedlaoui, Allal"

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    Effect of form defect in Thin-Walled cylinder assembly
    (Springer, 2023) Bedlaoui, Allal; Boutoutaou, Hamid
    Shrink-ft assemblies have been used to ofer a more robust running surface for wooden wheels for a long time. Generally, the two parts are cylindrical or conical. Shrink-ft is now an operation that involves creating contact between two cylinders, there is no third party, and this is good economically. It’s employed in a variety of industries, including automotive, aerospace, oil and gas, and train wheels. To do this operation, the inner cylinder’s outer radius must be greater than the outer cylinder’s inner radius, that diference between them is called ’interference’, the latter is being important in the assembly because it contributes to increasing the resistance of the assembly. There are three ways to do this: the frst by heating the outer cylinder until it expands, the second by cooling the inner cylinder until it shrinks and the third way is to realize the ftting under a press. When two cylindrical components are assembled by pushing or shrinking one onto the other, at the interface between the two matching parts, a contact pressure and friction force is formed. We study a shrink-ft assembly made up of two hollow cylinders in this paper, taking into account that the contact surfaces are not perfect but contain form defects, we try to know the efect of form defects and their role in the cohesion of the assembly using numerical simulation
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    Effect of form defect on pipe surfaces subjected to pressure at the assembly point
    (2022) Bedlaoui, Allal; Boutoutaou, Hamid
    Shrink-fit assemblies have been used to offer a more robust running surface for wooden wheels for a long time. Generally, the two parts are cylindrical or conical. Shrink-fit is now an operation that involves creating contact between two cylinders, there is no third party, and this is good economically. It’s employed in a variety of industries, including automotive, aerospace, oil and gas, and train wheels. To do this operation, the inner cylinder’s outer radius must be greater than the outer cylinder’s inner radius, that difference between them is called “interference,” the latter is being important in the assembly because it contributes to increasing the resistance of the assembly. There are three ways to do this: the first by heating the outer cylinder until it expands, the second by cooling the inner cylinder until it shrinks, and the third way is to realize the fitting under a press. When two cylindrical components are assembled by pushing or shrinking one onto the other, at the interface between the two matching parts, a contact pressure and friction force is formed. In this paper, we study shrink-fit assembly consisting of two thin hollow cylinders with the inner cylinder subjected to pressure, this actually represents what happens to the tubes at the assembly point (where the tube meets the other), taking into account that the surfaces are not perfect but are wavy, meaning they contain form defects. Using numerical simulation, we want to know the effect of the form defect on the distribution of stresses, deformations, and assembly resistance, and is this effect positive? or not
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    Etude du comportement élastoplastique des assemblages fréttés avec prise en compte du défaut de forme
    (Université M'Hamed Bougara Boumerdès : Faculté de Technologie, 2024) Bedlaoui, Allal; Boutoutaou, Hamid(Directeur de thèse)
    Dans ce travail, le défaut de forme est introduit pour étudier l'assemblage par frettage dans les surfaces de contact entre les composants, car peu d'études ont abordé ce sujet, bien que cela soit plus réaliste que de considérer les surfaces comme parfaite. Le but de l'étude est de connaître l'effet positif du défaut de forme sur l'assemblage, notamment dans le cas de la plasticité, sur lequel nous nous intéressons spécifiquement dans ce travail. Des simulations numériques ont été réalisées pour un assemblage fretté, en prenant en compte les défauts de forme. Les résultats ont été comparés à ceux obtenus dans le cas parfait, et finalement les résultats de la simulation ont été confirmés en utilisant l'expérimentale sur certains des échantillons
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    Optimization of contact surfaces in assembly in the presence of form defects and interference
    (Springer Nature, 2023) Bedlaoui, Allal; Boutoutaou, Hamid; Guerrache, Fadila
    Shrink-fit assembly is one of the most important mechanical assembly methods. It has been used for many years because it is economical due to it needing only two components an axis and a hub, as the outer diameter of the axis is greater than the inner diameter of the hub and the difference between them is the “interference.” The shrink-fit assembly is used in several fields such as the manufacture of aircraft, cars, and connecting oil and gas pipelines. Assembly is achieved either by heating the hub and cooling the axis or by force. When assembling, contact pressure is formed on the contact area between the axis and the hub. Usually, the contact area is considered perfect, but in reality, it contains defects that vary in amplitude and number. In this article, we study the role of the form defect and interference in the 3D assembly by studying its effect on the extraction force and assembly coherence, with use numerical simulation to confirm this. Component separation experiment was applied to validate the simulation results