M. Mazari

M. Mazari
University of Sidi-Bel-Abbes

Professor

About

63
Publications
8,629
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
262
Citations
Citations since 2016
26 Research Items
181 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
Additional affiliations
July 2000 - October 2015
University of Sidi-Bel-Abbes
Position
  • Research Assistant

Publications

Publications (63)
Article
Full-text available
The mechanical properties of high-density polyethylene pipe welded (and above all its resistance to brittle fracture) are a decisive factor in estimating the service life of two welded pipes use for the distribution of drinking water. The purpose of this research is to exploring the variation of the mechanical properties of welded and unwelded pipe...
Article
Full-text available
The present paper has made it possible to highlight the thermo-mechanical behavior of the bead weld by the butt fusion welding process of two high-density polyethylene (HDPE) pipes. We proposed a welding technic for assembly two plastic pipes to see the effect of fluid pressure and the stress distribution during the welding process at the bead weld...
Article
Full-text available
Absract. In this paper the experimental study of the fragility, ductility fracture and the mechanical behavior of high-density polyethylene pipe cracked is subject with know the damage law taken account of the deformation velocity which related to the cracking speed. The ductile fracture of HDPE pipes is characterized by a short crack that propagat...
Article
Full-text available
Absract. In this paper the experimental study of the fragility, ductility fracture and the mechanical behavior of high-density polyethylene pipe cracked is subject with know the damage law taken account of the deformation velocity which related to the cracking speed. The ductile fracture of HDPE pipes is characterized by a short crack that propagat...
Article
The fatigue lifetime predictions for semi-crystalline polymer, high density of polyethylene HDPE cases, is a new research problem, this work is focused on a simulation of the fatigue lifetime in PE100 pipes under internal pressure taking into account the influence of dimension parameters and internal pressures using the AFGROW software. Where, the...
Article
Full-text available
The present paper is devoted to the experimental study of the mechanical behavior of high-density polyethylene structure subjected to traction and welded by means of butt-welding process. We were based ourselves on experimental tests which have been carried out to characterize the material studied, introducing the ductility or fragility of the bead...
Conference Paper
Full-text available
La soudure se compose de plusieurs zones ayant chacune une microstructure propre et donc des propriétés mécaniques différentes. Nous avons utilisé les propriétés locales par des essais de traction sur micro-éprouvettes et par corrélation d'images. Ces résultats nous ont permis, par la suite, de simuler le comportement global en traction d'un joint...
Conference Paper
Full-text available
L'objectif de ce travail est de formuler un ensemble de recommandations concernant le choix des différents facteurs qui peuvent influer sur le processus de soudage par friction malaxage FSW et de trouver un modèle mathématique qui peut relier entre ces différents facteurs choisis. Il a ainsi été montré que les paramètres les plus influents sont dan...
Conference Paper
Full-text available
L'objectif de ce travail est de formuler un ensemble de recommandations concernant le choix des différents facteurs qui peuvent influer sur le processus de soudage par friction malaxage FSW. Il a ainsi été montré que les paramètres les plus influents sont dans l'ordre : la vitesse de rotation et la vitesse de soudage. L'étude d'interaction a permis...
Article
Full-text available
In fracture mechanics (domain of cracked environments), it is concerned to forecast the behavior of the structures until their ruin. Friction Stir Welding (FSW) is a new process for solid-state joining, it can weld high strength aluminum alloys from the 2000 series. However, despite the research work carried out on the FSW process, the performance...
Conference Paper
Le présent article traite une étude expérimentale du comportement mécanique de la structure en polyéthylène à haute densité (PEHD) soudée par un procédé de soudage bout à bout soumis à une charge de traction, Dans cette étude, nous nous sommes basés sur des tests expérimentaux réalisés afin de caractériser le matériel étudié, introduire la ductilit...
Article
Full-text available
The present paper summarizes the experimental study of the mechanical behavior of high-density polyethylene structure welded by butt-welding process, subjected to tensile loading. In this work, we based on experimental tests in order to characterize the studied material, introducing the ductility and the fragility of the bead-welded section materia...
Article
Full-text available
In this paper, an experimental and a numerical analysis were carried out using High density polyethylene (HDPE). Sheets with an initial central crack (CCT specimens) inclined with a given angle are investigated and compared to the loading direction. The kinking angle is experimentally predicted and numerically evaluated under mixed mode (I+II), as...
Conference Paper
Full-text available
In our daily lives plastics materials play a very important role, their applications are increasingly extensive. Needs of the world for these materials is increasing from one year to year. This strong growth has led to many studies on the behavior of these new materials, leading to the development of techniques and methods adapted to polymers and i...
Article
In this paper, the Aluminum A6060-T5 plates of thickness 2 mm was friction stir spot welded (FSSW), and the effects of welding parameters (rotation speed, plunge speed and distance from the center of pin) on the temperature variation of the joints were investigated. The experimental design method is used to investigate the effects of welding parame...
Article
n the present work, the performance of multilayer coated carbide tool was investigated considering the effect of cutting parameters during turning of 34CrMo4 Low alloy steel. It has high strength and creep strength, and good impact tenacity at low temperature. It can work at–110 C to 500 C. And EN 10083-1 34CrMo4 owns high static strength, impact t...
Article
Full-text available
For the characterization of High-density polyethylene (HDPE) pipes according to the operating conditions, the Nol ring test is an adequate method to rapidly and inexpensively determine the mechanical properties with good effectiveness. In this work, Nol ring tests will be carried out on HDPE material with different crack depth ratios. Based on thes...
Conference Paper
Full-text available
High-density polyethylene (HDPE) is widely used for many years for pipes of industrial facilities. The range of applications was extended to construction industry: transmission of gas, water, sewage disposal... Among the consolidation process of pipes made from high-density polyethylene (HDPE), fusion welding or butt weld fusion is considered to be...
Article
Full-text available
The process of friction stir welding is a significant advance in the field of research on the Friction welding technique known for several decades. This assembly technique has obvious originality since welding is performed in the solid state, which can help eliminate birth defects related to solidification phase compared to conventional welding. Th...
Article
Full-text available
The energy-based approach to predict the fatigue crack growth behavior under constant and variable amplitude loading (VAL) of the aluminum alloy 2024 T351 has been investigated and detailed analyses discussed. Firstly, the plastic strain energy was determined per cycle for different block load tests. The relationship between the crack advance an...
Article
Full-text available
Ce sujet de recherche vise le procédé de soudage par friction malaxage (FSW). L’étude menée se focalise sur la corrélation entre les paramètres du procédé (vitesse d’avance et fréquence de rotation de l’outil) et les caractéristiques mécaniques et microstructurales des tôles d’alliage d’aluminium 5083 H111 de six millimètres d’épaisseur mises bout...
Conference Paper
Le procédé de soudage par friction malaxage « Friction Stir Welding » fut inventé par TWT (The Welding Institut) pour assurer un réel besoin dans les secteurs de transport aérien, naval et ferroviaire. Malgré le nombre considérable d’études effectuées depuis son avènement en 1991, le contrôle du procédé n’est pas encore effectif incluant l’évaluati...
Article
Full-text available
In this paper, a numerical modeling of crack propagation for rubber-like materials is presen- ted. This technique aims at simulating the crack growth under mixed-mode loading based on the strain energy density approach. At each crack increment length, the kinking angle is evaluated as a function of the minimum strain energy density (MSED) around th...
Conference Paper
Full-text available
Résumé: Diverses techniques de réparation de structures fissurées réalisées en matériaux, tel que perçage d’un trou avec expansion, renfort métallique sont de plus en plus efficaces pour comprendre les phénomènes d'arrêt ou de retard de la propagation de fissure dans les matériaux endommagés. Ces techniques sont considérées comme une solution prome...
Article
Full-text available
In addition to uncertainty such as material strength, notch geometries, defect contents and residual stresses, welded components are often subjected to variable amplitude service loads. The objective of this investigation is to determine the fatigue strength of friction stir welds in AA6082-T6 under constant and variable amplitude loading and analy...
Article
Full-text available
Plasticity effects at the crack tip had been recognized as “motor” of crack propagation, the growth of cracks is related to the existence of a crack tip plastic zone, whose formation and intensification is accompanied by energy dissipation. In the actual state of knowledge fatigue crack propagation is modeled using crack closure concept. The fatigu...
Article
Finite element analysis combined with the concepts of linear elastic fracture mechanics provides a practical and convenient means to study the fracture and crack growth of materials. The onset criterion of crack propagation is based on the stress intensity factor, which is the most important parameter that must be accurately estimated and facilitat...
Article
When the loading or the geometry of a structure is not symmetrical about the crack axis, rupture occurs in mixed mode loading and the crack does not propagate in a straight line. It is then necessary to use kinking criteria to determine the new direction of crack propagation. The aim of this work is to present a numerical modeling of crack propagat...
Article
When the loading or the geometry of a structure is not symmetrical about the axis of the crack, the rupture occurs in mixed mode loading, and the crack does not propagate in a straight line. It is then necessary to use kinking criteria to determine the new direction of crack propagation. The aim of this work is to present a numerical modeling of cr...
Article
Full-text available
Experience shows that a damage induced by a given cycle is dependent on the loading history. In this regard, the objective of this paper is to study and describe the phenomenology of the loading history on crack propagation. Different loading configuration has been considered for fatigue crack propagation of XC38 steel; overload cycles followed by...
Chapter
In this study we were interested in the behavior of two aluminum alloys (2024 T351 and 7075 T7351) requested by a simple overload with an aim of determining the number of cycles of delay of each one and of comparing their behavior various environments (air and vacuum).For that, we carried out fatigue tests stopped by a simple overload with a rate o...
Article
Full-text available
The crack propagation behavior in a 2024 T351 Aluminum Alloy under constant amplitude loading has been studied. This study is complemented by quantitative microfractographic observations and energetic analysis. The obtained results under constant amplitude fatigue tests show that different crack propagation stages can be identified and correlated w...
Conference Paper
The fatigue crack growth behavior under constant amplitude and variable amplitude loading of the aluminum alloy 2024 T351 are analyzed using in terms energy parameters. In the case of variable amplitude loading tests, the evolution of the hysteretic energy dissipated per block is shown similar with that observed under constant amplitude loading. A...
Article
Full-text available
Evolution of crack depends on several intrinsic parameters of material, such as geometries and mechanical properties of structure, or extrinsic properties like the extent of the crack or applied load.All these parameters must be taken into account in the digital simulation, in order to study the quasi-static crack propagation.It is impossible to us...
Article
The friction stir welding is a process which made improvement in the light construction industries. The application of this new process lies in the capacity to assemble alloys of aluminium and more obviously with alloys which are not easily weldable alloys by the traditional processes. In our study, we centered the tests on the description of the s...
Article
In this work, we are interested in the study of the mechanical behavior of the elastomers materials. We analyze mainly their ultimate properties. This study is based on the first Seth strain measures invariant [1] and the literature experimental data [2,3], allowing to take into account of the multiaxial loading effects. With this intention, the st...
Article
The growth of crack is related to the existence of a plastic zone at the crack tip; whose formation and growth is accompanied by energy dissipation. The estimation of this energy is generally done by the so called global methods (hysterisis loops) or the micro-gages. In the present study, the micro-hardness measures in the plastic zone are used to...
Article
The knowledge of fracture behavior of elastomers necessitates the comprehension of crack initiation and propagation phenomena which pose difficulties related to the deformation of elastomers. The reliability of elastomer materials is linked to their resistance to rupture. This resistance can be evaluated using the global approach of fracture mechan...
Article
Plasticity effects at the crack tip had been recognized as “motor” of crack propagation. The growth of cracks is related to the existence of a crack tip plastic zone, whose formation and intensification is accompanied by energy dissipation. In the actual state of knowledge, fatigue crack propagation is modeled using crack closure concept. Recent st...
Article
A New software for the estimation of the fatigue crack initiation life in notched components has been developed, based on the local strain approach. This new implementation includes a 'short crack model'. The crack driving force is evaluated by means of the stress intensity factor range for short cracks emanating from the notch, and by using an int...
Article
The growth of cracks is related to the existence of a plastic zone at the crack tip, the formation and growth of which are accompanied by an energy dissipation. The estimation of this energy is generally made by global measures. In our study, we have used microhardness measurements at the crack tip for estimating energy. The results obtained are mo...
Article
Based on constant amplitude fatigue tests on 12 mm thick plates, in a 2024 T351 aluminum alloy, a previous study has shown that the spatial distribution of predominant facies reflects the effects of stress intensity factor and the load ratio. In this paper, this technique is applied to constant amplitude crack propagation tests to thin plates of th...
Article
The crack propagation behavior in 2024-T351 Aluminum Alloy under constant amplitude loading has been studied. This study is complemented by crack opening load measurements using a compliance technique and by quantitative microfractographic observations. The results obtained under constant amplitude fatigue tests show that different crack propagatio...

Network

Cited By

Projects

Projects (2)
Project
The objective of the study is to investigate the behavior of the bead under different stresses to estimate the lifetime of a weld with defects and by which cracks can emanate.