7 research outputs found
Evaluation de la résistance à la rupture par fatigue d’un rail de profile UIC54 E1
No full textInternational audienc
Damage of honeycomb composite materials under different solicitation NT
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Optimisation des paramètres de coupe pour minimiser la température de coupe lors de l'usinage des tubes HDPE-100
No full textInternational audienceManufacturing of High Density Polyethylene (HDPE) pipes is usually achieved by extrusion processes. However, various joining or fitted parts and mechanical testing samples are prepared by material removal methods. This study focuses on the machinability of the HDPE tough resin used for piping and fittings to make standard test specimens. The effect of the cutting parameters i.e. cutting speed (Vc), feed (f) and depth of cut (ap) on the measured cuttingtemperature (t°) is evaluated. A second order model has been elaborated between the cutting parameters and cutting temperature by using the response surface methodology (RSM) and experimental design, in order to determine the best machining conditions. The results reveal that the cutting speedhasa significant effect on the cutting temperature of the HDPE.La production de tubes en polyéthylène de haute densité (HDPE) est habituellement assurée par le procédé d’extrusion. Cependant, des accessoires et des pièces de jonction ou d’essai doivent être fabriqués par d’autres procédés d’enlèvement de matière. Cette étude s’intéresse à l’usinabilité de la matière HDPE obtenue par extrusion en vue de la préparation d’éprouvettes standards pour le contrôle qualité et les protocoles de recherche. Elle considère l’influence des paramètres de coupe i.e. la vitesse de coupe (Vc), l’avance (f) et la profondeur de passe (ap) sur la température de coupe (t°). Un modèle de second ordre est développé pour prédire la température de coupe en utilisant la méthodologie de surfaces de réponse (RSM) et le plan d’expériences, en vue de déterminer les meilleures conditions d’usinage. Les résultats trouvés indiquent que la température de coupe du HDPE est considérablement influencée par la vitesse de coupe
Influence du rapport d’aspect et de l’épaisseur sur la disparition des plis lors de l’étirement des feuilles minces
No full textInternational audienceCe travail a pour objectif l’étude numérique de l’influence du rapport d’aspect et de l’épaisseur d’une feuille mince soumise à une traction sur la disparition du plissement. Deux modèles de la déformation sont utilisés : le modèle de von Kàrmàn et un modèle de von Kàrmàn Amélioré. Les équations non linéaires obtenues sont résolues par la Méthode Asymptotique Numérique (MAN) en utilisant l’élément fini DKT18 dans la discrétisation en espace. Une comparaison entre les résultats obtenus par la MAN et ceux du code industriel Abaqus est présentée
A survey on author profiling, deception, and irony detection for the Arabic language
No full text[EN] The possibility of knowing people traits on the basis of what they write is a field of growing interest named author profiling. To infer a user's gender, age, native language, language variety, or even when the user lies, simply by analyzing her texts, opens a wide range of
possibilities from the point of view of security. In this paper, we review the state of the art about some of the main author profiling problems, as well as deception and irony detection, especially focusing on the Arabic language.Qatar National Research Fund, Grant/Award Number: NPRP 9-175-1-033Rosso, P.; Rangel-Pardo, FM.; Hernandez-Farias, DI.; Cagnina, L.; Zaghouani, W.; Charfi, A. (2018). A survey on author profiling, deception, and irony detection for the Arabic language. Language and Linguistics Compass. 12(4):1-20. https://doi.org/10.1111/lnc3.12275S120124Abuhakema , G. Faraj , R. Feldman , A. Fitzpatrick , E. 2008 Annotating an arabic learner corpus for error Proceedings of The sixth international conference on Language Resources and Evaluation, LREC 2008Adouane , W. Dobnik , S. 2017 Identification of languages in algerian arabic multilingual documents Proceedings of The Third Arabic Natural Language Processing Workshop (WANLP)Adouane , W. Semmar , N. 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The influence of variations of geometrical parameters on the notching stress intensity factors of cylindrical shells
No full textThe modern approach of Virtual Engineering allows one to detect with some accuracy the residual life of components especially free of cracks. The life estimation becomes cumbersome when the components contain a crack. A straightforward formulation requires a parameter that considers geometrical constraints and materials properties. The magnitude of the stress singularity developed by the tip of a crack, needs to be expressed by the Stress Intensity Factors (SIF). In order to prove the validity of the results, calibration by experimental and/or analytical technique is required. To have a better understanding of this parameter, in the first part of this paper an analytical model to compute the SIF connected to crack propagation into Mode I has been implemented. The case study displays a pipeline component with a crack defect submitted to internal pressure. Therefore, an appropriate correlation between the analytical approach and numerical simulation has been established embedded.</p
Efficiency of Green Inhibitors Against Hydrogen Embrittlement on Mechanical Properties of Pipe Steel API 5L X52 in Hydrochloric Acid Medium
No full textInternational audienceThe impact of environment can cause many types of degradations such as pitting corrosion, stress corrosion cracking and sulphide stress cracking of metal structures. One of the serious problems of oil extracting industry is the corrosion process. Recently, there were a number of resource failures caused by internal corrosion phenomena recorded in oil and gas industry; the reports confirmed that the failures were due to the effect of traces amounts of Hydrochloric acid. The objective of this study is to use the plant extracts as corrosion inhibitors for API 5L X52 steel. Indeed, these natural extracts contain many families of natural organic compounds "Green", readily available and renewable. The conducted mechanics tests in this study in the presence of green inhibitors of plant origin will give very promising results on the fracture mechanics properties. The importance of this area of research is to be attributed to the fact that natural products can replace the currently used toxic organic molecules that are condemned by the world directives for using environmentally unacceptable inhibitors
