Dr. KHELLAFI Habib خلافي حبيب
Faculté des Sciences et de la Technologie
Département Génie mecanique
Grade : Maitre de conférence classe A
Numéro de Téléphone :773849689
Adresse électronique institutionnel
Adresse électronique personnel
Adresse postale :
El-Bordj Mascara 29012
Laboratoire des sciences et techniques de l'eau
Lien Google Scholar :
Lien Researchgate:
Mots Clés de Recherche :


Parcours académique :

Baccalauréat scientifique, option : Science exacte, Lycée El Bordj, Mascara, juin 1995. Diplôme d’Ingénieur en génie mécanique spécialité construction mécanique, Université Mustapha Stambouli Mascara, septembre 2001. Diplôme de Magister en génie mécanique spécialité mécanique des matériaux et modélisation, Université Mustapha Stambouli Mascara, décembre 2011.Titre : Quantification de l’endommagement du PVC par une Analyse Numérique. Diplôme de Docteur en génie mécanique spécialité mécanique des matériaux et modélisation, Université Djilali Liabes Sidi Bel Abbes, décembre 2016.Titre : Contribution à l’étude de la quantification de l’endommagement et détermination des facteurs influençant le processus de nucléation des cavités dans les polymères. Diplôme d'Habilitation Universitaire,Université Mustapha Stambouli Mascara, Juillet 2019.

Ouvrages individuels/Ouvrages collectifs

  • Titre : Polycopié de cours Assemblage des matériaux

  • Auteur : KHELLAFI Habib
  • Date d'edition :
  • Resume :

  • Projets de recherche

  • Description:
  • Code de projet: A11N01UN2901190001
  • Agrées le : en 2019-01-01
  • Description:
  • Code de projet: J0303720140202
  • Agrées le : en 2015-01-01

  • Publications

  • Effect of Tool Design on the Mechanical Properties of Bobbin Friction Stir Welded High-Density Polyethylene Sheets: Experimental Study
  • La revue : International Journal of Engineering Research in Africa
    Domaine :
    Mots Clés : Friction stir welding (FSW); Polymer HDPE; Welding tool; Microhardness; Tool geometries; Bobbin tool FSW
    Auteur : Djilali BOUHA, Habib KHELLAFI, El Bahri OULD CHIKH, Hadj Miloud MEDDAH , Abdellah KAOU
    Issn : 663-4144 Eissn : vol : 61, Num : , pp : 95-114
  • Date de publication : 2022-07-25
  • Résume :
    Welding polymers by the friction stir welding (FSW) technique is one assembly process among several known assembly techniques which consists in welding two materials without filler material. FSW process is based on the generation of heat due to friction and material deformation under an axial force. Among the main aspects affecting material flow, the choice of welding tool geometry has become of great interest to improve the welds quality. The main objective of this unique work is to weld polymers using one of the FSW techniques. A new method of welding HDPE (high density polyethylene) plates, called BT-FSW (bobbin tool friction stir welding) was developed. Standard rectangular shape intended for the distribution of natural gas has been successfully welded by BT-FSW. Tensile tests and hardness measurements were carried out on samples cut from the welded sheets and the results were analyzed to compare the mechanical characteristics of the plates welded by the BT-FSW and conventional FSW (C-FSW) processes. The results of the comparative studies on the micro-hardness characteristics and mechanical properties of the two welding processes indicate that welding using the bobbin tool can significantly reduce hardness and improve both weld formation and mechanical properties of joints. This study showed that the design of the welding tool has a big impact on the weld strength. An improvement in the mechanical properties of the specimens welded by BT-FSW was observed to give a better welding quality for the polymers studied.

  • Parametric Study Of Friction Stir Spot Welding (FSSW) For Polymer Materials Case Of High Density Polyethylene Sheets: Experimental And Numerical Study
  • La revue : Frattura ed Integrità Strutturale
    Domaine :
    Mots Clés :
    Auteur : Djilali Benyerou, El Bahri Ould Chikh, Habib Khellafi, Hadj Miloud Meddah, Ali Benhamena, Kaddour Hachelaf, Abdellah Lounis
    Issn : Eissn : vol : 15, Num : 55, pp :
  • Date de publication : 2020-11-24
  • Résume :
    Friction stir spot welding (FSSW) is a very important part of conventional friction stir welding (FSW) which can be a replacement for riveted assemblies and resistance spot welding. This technique provides high quality joints compared to conventional welding processes. Friction stir spot welding (FSSW) is a new technology adopted to join various types of metals such as titanium, aluminum, magnesium. It is also used for welding polymer materials which are difficult to weld by the conventional welding process. In various industrial applications, high density polyethylene (HDPE) becomes the most used material. The parameters and mechanical properties of the welds are the major problems in the welding processes. In this paper, we have presented a contribution in finite element modeling of the friction stir spot welding process (FSSW) using Abaqus as a finite element solver. The objective of this paper is to study the HDPE plates resistance of stir spot welding joints (FSSW). First, we show the experimental tests results of high-density polyethylene (HDPE) plates assembled by friction stir spot welding (FSSW). Three-dimensional numerical modeling by the finite element method makes it possible to determine the best representation of the weld joint for a good prediction of its behavior. Comparison of the results shows that there is a good agreement between the numerical modeling predictions and the experimental results.

  • Experimental and Numerical Fracture Modeling Using XFEM of Aluminum Plates
  • La revue : International Journal of Engineering Research in Africa
    Domaine :
    Mots Clés :
    Auteur : Ali Taghezout, Bendouba Mostefa ,Djebli Abdelkader ,Aid Abdelkarim et Habib Khellafi
    Issn : Eissn : vol : 46, Num : , pp : 45-52
  • Date de publication : 0000-00-00
  • Résume :
    In this paper a numerical modeling was carried out to study the problem of plane elasticity in a medium cracked by the method of the extended finite elements (XFEM) in a thin cracked plate made of aluminum using the software Abaqus 6.13.This method improved the capability of the classical finite element method especially the crack propagation problems. Furthermore, the extended finite elements method has been used to simulate tensile and fracture behavior of the study materials. Based on variation in size and shape of crack, the results obtained will be compared with those obtained experimentally, this comparison shows a good agreement.

  • Finite element based fatigue analysis of 6082 Aluminum alloy under random loading
    Domaine :
    Mots Clés :
    Auteur : Khellafi Habib , Bendouba Mostefa ,Djebli Abdelkader, Aid Abdelkrim, Benseddiq Noureddine , Benguediab Mohamed , Talh Abderrahim.
    Issn : Eissn : vol : 5 (2018), Num : , pp : 73–80
  • Date de publication : 0000-00-00
  • Résume :
    Mechanical and structural components are subject in the most cases during their services to random loading. For this reason, it is necessary to reduce the complex history of these kinds of loading in a series of constant amplitude cycles. There are several counting methods that lead to different results. Among all these methods, it is recognized that the Rainflow Cycle Counting method provides the most conservative results. In this paper, a finite elements analysis technique is presented to predict the fatigue life using this method associate with the S-N method which is used for high cycle fatigue applications that makes no distinction between initiation or growing a crack, but rather, predicts the total life to failure. Comparison between numerical and experimental results is considering in this paper.

  • Investigation of Mechanical Behaviour of the Bone Cement (PMMA) under Combined Shear and Compression Loading
  • La revue : Journal of Biomimetics, Biomaterials and Biomedical Engineering
    Domaine :
    Mots Clés :
    Auteur : KHELLAFI Habib,Bouziane Mohamed Mokhtar ,Djebli Abdelkader, Abdeldjelil Mankour,Bendouba Mostefa,Bel Abbes Bachir Bouiadjra et Ould Chikh El Bahri.
    Issn : Eissn : vol : 41, Num : , pp :
  • Date de publication : 0000-00-00
  • Résume :
    Generally, implants fixations in orthopedic surgery are insured by bone cement; which is generated mainly from polymer polymethylmethacrylate (PMMA). Since, the cement is identified as the weakest part among bone-cement-prosthesis assembly. Hence, the characterization of mechanical behaviour is of a crucial requirement for orthopaedic surgeon’s success. In this study, we investigates the failure behaviour of bone cement, under combined shear and compression loading, for the aim to determine the strengths of bone cement for different mode loading conditions. Therefore, experimental cylindrical specimens has been tested to assess different shear-compression stresses. Based on the mechanical tests, a finite elements model of cylindrical specimens was developed to evaluate stresses distribution in the bone cement under compression, shear and combined shear-compression loading. Results show that, the load which leading to the failure of the cement decreased with increasing of the specimen angle inclination with respect of loading direction.

  • Experimental and Numerical Analysis of the Polyvinyl Chloride (PVC) Mechanical Behavior Response
  • La revue : Computers, Materials and Continu CMC
    Domaine :
    Mots Clés :
    Auteur : KHELLAFI Habib , Meddah Hadj miloud, OuldChikh El Bahri,Bouchouicha Benattou, Benguediab Mohamed et Bendouba Mostefa
    Issn : Eissn : vol : 49, Num : 1, pp :
  • Date de publication : 0000-00-00
  • Résume :
    The polyvinyl chloride PVC is a polymer material widely used for a large variety of applications. The present work focuses on the identification of the physical processes responsible for the mechanical properties of the PVC containing different crystallinities rate applied in large deformation and different strain rates. In order to understand the behavior of the PVC, a thermodynamic modeling is needed. Therefore, the contribution of this approach was demonstrated by experiment and numerical modeling. This comparative study demonstrates that the proposed model provides better agreement with experimental evidence.

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