
Brahami AbdessamadUniversité des Sciences et de la Technologie d'Oran Mohamed Boudiaf | USTOMB · DEPARTMENT OF MECHANICAL ENGINEERING
Brahami Abdessamad
Doctor of Engineering
About
19
Publications
49,974
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Introduction
Additional affiliations
December 2019 - June 2023
November 2018 - February 2023
Entreprise national des industries electroniques ENIE
Position
- Mechanical engineer
December 2019 - July 2020
Education
December 2013 - July 2018
September 2011 - June 2013
September 2008 - June 2011
Publications
Publications (19)
Friction stir Welding (FsW) is a solid-state welding method, offering superior weld quality for aluminum alloys. Despite its advantages, the thermo-mechanical characteristics of pinless FsW, especially for aa6060-t4 aluminum thin sheets, remain underexplored. this study aims to fill this gap by examining the effects of different welding parameters...
Quantitative examination of localized corrosion, namely exfoliating corrosion (EXCO), of aluminum alloys 2024 T3 and 7075 T6 is carried out in this paper. The EXCO mechanism was also considered, with an emphasis on the consequences of a combination of materials, environment, and mechanical stress. Microstructures of different alloys were examined u...
In practice for all metallic materials, damage by fatigue usually takes in two steps, the appearance of an initial crack which then grows as a function of the present microstructure. The objective of this study is to identify the elements influencing the fatigue crack growth rate on aluminum alloys of different microstructures. Characterization tes...
In this paper, friction stir welding process of high-density polyethylene was studied. Two tools have been chosen, concave and plate, to explore the influence of the tool on the welding quality of the material. In addition, different parameters, rotational speed and welding speed, were investigated. Tensile tests were performed after welding in ord...
In the present paper, the impact of exfoliation corrosion (EFC) of 2024 and 5083 aluminum alloys on the residual mechanical properties was investigated. Tensile test had been carried out on pre-corroded specimens, exposed to laboratory accelerated exfoliation corrosion solution. The analysis suggests that exfoliation exposure leads to decrease the...
In this paper, quantitative investigation of localized corrosion, in particular, exfoliating corrosion (EXCO) of aluminum alloys 2024 T3 and 7075 T6, is carried out. The mechanism of EXCO focusing on the effects of the combination of materials/environment/mechanical stress was also considered. An optical microscope (MO) and a scanning electron micr...
The friction stir welding (FSW) has become an important welding technique to join materials that are difficult to weld by traditional fusion welding technology. The model used in this study is a simplified version of the thermo-mechanical model developed by Zhu and Chao for FSW with aluminum alloy A6061-T6. Zhu and Chao presented nonlinear thermal...
In this paper, numerical modelisation of thermo mechanical behavior of FSW process of 6061-T6 aluminum alloy were performed. A three dimensional (3D), transient, non-linear structural-thermal model was developed using ANSYS software to simulate the distribution of the temperature and the mechanical stresses during FSW of the aluminum alloy. The sim...
Friction stir welding (FSW) has become an important welding technique to join materials that are difficult to weld by traditional fusion welding. The model in this study is a simplified version of the thermomechanical model developed by Zhu and Chao for FSW of aluminium alloy A6061-T6. Zhu and Chao presented nonlinear thermal and thermo-mechanical...
Engineering materials, mostly steel, are heat treated under controlled sequence of heating and cooling to alter their physical and mechanical properties to meet desired engineering applications. This paper presents a study of the influence of austenitization temperature, cooling rate, holding time and heating rate during the heat treatment on micro...
Le durcissement structural des alliages d'aluminium c’est l’une des solutions que les métallurgistes ont adopté pour améliorer les propriétés mécaniques des alliages d’aluminium. Mais la corrosion exfoliante et la corrosion intergranulaire dans ces alliages d'aluminium ont un processus très complexe qui peut être affecté par divers facteurs tels qu...
In practice for all metallic materials, damage by fatigue usually takes in two steps, the appearance of an initial crack which then grows as a function of the present microstruc-ture. The objective of this study is to identify the elements influencing the fatigue crack growth rate on aluminum alloys of different microstructures. Characterization te...
L'objectif de ce travail était d'étudier l'influence de la corrosion exfoliante (EFC) des alliages d'aluminium 2024 et 5083 sur la dégradation des propriétés mécaniques. L'essai de traction a été effectué sur des échantillons pré-corrodés, exposés à une solution de corrosion exfoliante accélérée en laboratoire. L'analyse suggère que l'exposition à...
L’objectif de cette étude est de voir l’influence des éléments d'alliage et de la microstructure sur les propriétés mécaniques et sur le comportement en fatigue sur des différentes nuances d’alliages d’aluminium. Passant par des essais de caractérisations mécaniques et d'analyse microstructurale sur les nuances (2024-T3, 5083-H111, 6082-T6 et 7075-...
La méthode des éléments finis étendus (X-FEM) a été implantée dans le code de calcul ANSYS APDL. Cette méthode numérique permet de réaliser avec succès des simulations efficaces de propagation arbitraire de fissure dans un domaine d'applications variées : fatigue (cf. [5] et [6]), rupture fragile en élasto-dynamique [7], multi-fissuration (cf. [10]...
Cette étude nous a permis de voir l’influence de la discontinuité géométrique, à savoir les défauts ou les fissures dans les alliages d’aluminiums (7075-T6 et 6082-T6), sur le comportement en fatigue, autrement dit la durée de vie faisant appel aux critères de la mécanique de la rupture, à l’aide de code de calcul ANSYS-WORKBENCH. Cette discontinui...
The objective of this thesis is the mastery of the technique of friction stir welding (FSW) and parameter optimization on a high density polyethylene (HDPE). This assembly method is based on the phenomenon of mixing caused by the passage of the tool (pin), a key element of this technique. The work will include: 1. Perform welding by FSW process. 2....
This study allowed us to see the influence of geometric discontinuity namely defects or cracks in the aluminum alloys (7075-T6 and 6082-T6), on the fatigue behavior, in other words life using the criteria of fracture mechanics using Ansys finite element code. This discontinuity has multiple internal or external origins resulting from improper desig...
Questions
Questions (2)
Dear all,
Im traying to model contact betweeon two bodies (Baloon and tube), please see the descriptif figure attached !!
I'v made two steps : the first one is applying pressure on internal surface of the baloon and the second step if for displacement of the baloon along the tube !
I've choosed Money-Rivlin model with two parameters
for the contact i've choosed Frictional with 0.5 !!
At the moment i've fixed all converging problems for the first step but i have always converging problems for the second step under this error message 'The solver engine was unable to converge on a solution for the nonlinear problem as constrained. Please see the Troubleshooting section of the Help System for more information'.
How can I overcome this problem