Academic literature on the topic 'Arcan test'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Arcan test.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Arcan test"
1
Gruben, Gaute, Egil Fagerholt, Odd Sture Hopperstad, Tore Børvik, and Magnus Langseth. "Numerical Simulation of Ductile Fracture in Modified Arcan Test." Procedia Materials Science 3 (2014): 661–66. http://dx.doi.org/10.1016/j.mspro.2014.06.109.
Full text
2
Hasanpour, Rohola, and Naghdali Choupani. "Rock fracture characterization using the modified Arcan test specimen." International Journal of Rock Mechanics and Mining Sciences 46, no. 2 (2009): 346–54. http://dx.doi.org/10.1016/j.ijrmms.2008.07.004.
Full text
3
Pinto, A. M. G., A. G. Magalhães, Raul D. S. G. Campilho, Lucas F. M. Silva, J. A. G. Chousal, and A. P. M. Baptista. "Shear Modulus and Strength of an Acrylic Adhesive by the Notched Plate Shear Method (Arcan) and the Thick Adherend Shear Test (TAST)." Materials Science Forum 636-637 (January 2010): 787–92. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.787.
Full textAbstract:
In this work, the shear modulus and strength of the acrylic adhesive 3M® DP 8005 was evaluated by two different methods: the Thick Adherend Shear Test (TAST) and the Notched Plate Shear Method (Arcan). However, TAST standards advise the use of a special extensometer attached to the specimen, which requires a very experienced technician. In the present study, the adhesive shear displacement for the TAST was measured using an optical technique, and also with a conventional inductive extensometer of 25 mm used for tensile tests. This allowed for an assessment of suitability of using a conventional extensometer to measure this parameter. Since the results obtained by the two techniques are identical, it can be concluded that using a conventional extensometer is a valid option to obtain the shear modulus for the particular adhesive used. In the Arcan tests, the adhesive shear displacement was only measured using the optical technique. This work also aimed the comparison of shear modulus and strength obtained by the TAST and Arcan test methods.
4
Prakash, Kevin, Khairul Salleh Basaruddin, Mohd Afendi Rojan, and Haftirman Idrus. "The Effect of Loading Mode on Fracture Toughness of Arcan Adhesive Joint." Applied Mechanics and Materials 786 (August 2015): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.786.3.
Full textAbstract:
This paper presents the experimental investigation on adhesive joint under three loading angles using a modified Arcan jig. Fracture test was performed using the fabricated Arcan specimens and Araldite adhesive with loading angle of 0°, 90° and 45° to represent Mode I, Mode II and mixed Mode loading, respectively. Eighteen specimens were prepared with adhesive thickness of 6 mm and nine of them with interface crack length of 5 mm. The result shows the stress intensity factor, K is influenced by the loading angle and the initial crack-line directions. KI was found greater than KII .
5
Muthu, Jacob. "Mixed mode properties of CNT reinforced composites using Arcan test rig." Frontiers of Structural and Civil Engineering 9, no. 4 (2015): 397–404. http://dx.doi.org/10.1007/s11709-015-0321-y.
Full text
6
Ni, Fujian, Shu Yang, Yu Zhu, and Andrew Braham. "Capturing mixed-mode cracking of asphalt concrete using the Arcan test." International Journal of Pavement Engineering 15, no. 1 (2013): 43–50. http://dx.doi.org/10.1080/10298436.2013.790969.
Full text
7
Greer, J. M., S. E. Galyon Dorman, and M. J. Hammond. "Some comments on the Arcan mixed-mode (I/II) test specimen." Engineering Fracture Mechanics 78, no. 9 (2011): 2088–94. http://dx.doi.org/10.1016/j.engfracmech.2011.03.017.
Full text
8
Kottner, Radek, Jan Heczko, and Jan Krystek. "Validation of identified material parameters of rubber using an Arcan shear test." Materials Today: Proceedings 12 (2019): 404–10. http://dx.doi.org/10.1016/j.matpr.2019.03.142.
Full text
9
Balcıoğlu, H. Ersen, and Derviş Yalçın. "The Determination of Fracture Characterization of Knitted Fabric Reinforced Composites Using Arcan Test." Fibers and Polymers 21, no. 4 (2020): 849–63. http://dx.doi.org/10.1007/s12221-020-9619-z.
Full text
10
Ciardiello, R., L. Greco, M. Miranda, F. Di Sciullo, and L. Goglio. "Experimental investigation on adhesively bonded U-shaped metallic joints using the Arcan test." Journal of Advanced Joining Processes 1 (March 2020): 100010. http://dx.doi.org/10.1016/j.jajp.2020.100010.
Full textDissertations / Theses on the topic "Arcan test"
1
Valès, Benjamin. "Développement d'un essai Arcan dynamique." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30315/document.
Full textAbstract:
Afin de limiter les impacts environnementaux, les industries du transport (automobile, aéronautique, etc.) cherchent à alléger leurs produits. Cette recherche de gain de masse peut conduire à l'utilisation des adhésifs dans la réalisation des structures assemblées. Dans les situations de crash, les joints de colle introduits peuvent jouer un rôle critique sur la tenue globale de l'assemblage. Par conséquent, la maîtrise de leur comportement mécanique devient un point clef de développement. Notamment en vue du « virtual testing », il est essentiel de disposer de lois de comportement fiables dans le but de fournir des outils de calcul prédictifs à l'ingénieur. Les travaux de thèse portent sur le développement d'une démarche expérimentale permettant de caractériser le comportement mécanique d'adhésifs sous sollicitations dynamiques combinées. Le développement d'une éprouvette Arcan et d'un dispositif de sollicitation dédiés à la caractérisation des adhésifs en dynamique constituent le coeur du travail de thèse. Après une phase de validation, le moyen d'essais développé a été utilisé afin de caractériser le comportement dynamique de trois adhésifs structuraux. Les résultats obtenus ont été comparés à des essais « structures » de type TAST. En parallèle de ces travaux expérimentaux, une ouverture sur la modélisation numérique des adhésifs est proposée. La stratégie de modélisation se base sur l'utilisation d'éléments cohésifs et d'une loi de comportement développée suivant la méthode de l'état local. L'identification des paramètres matériaux est réalisée par méthode directe et inverse à partir des résultats issus d'essais Arcan. La stratégie de modélisation développée a été transposée à des essais TAST et simple recouvrement. Les prédictions faites par les modèles sont proches des résultats expérimentaux validant ainsi l'approche numérique mise en oeuvreIn order to limit environmental impacts, the transport industries (automotive, aeronautics, etc.) are seeking to reduce the weight of their products. This search for mass gain can lead to the use of adhesives in the manufacturing of assembled structures. In crash situations, introduced bonded joints can play a critical role in the overall strength of the assembly. Consequently, their mechanical behaviour becomes a key development point. Especially for virtual testing, it is essential to have reliable behaviour laws in order to provide predictive computing tools to the engineer. The thesis work focuses on the development of an experimental approach to characterize the mechanical behaviour of adhesives under combined dynamic loadings. The development of an Arcan specimen and a test rig dedicated to the dynamic characterization of adhesives is the core of the thesis work. After a validation step, the developed test mean was used to characterize the dynamic behaviour of three structural adhesives. The results obtained were compared with "structural" TAST tests. In parallel of this experimental work, a first study on the numerical modelling of adhesives is proposed. The modelling strategy relies on the use of cohesive elements and a behaviour law developed according to the local state method. The identification of material parameters is carried out by direct and inverse methods from the results of Arcan tests. The modelling strategy developed has been transposed to TAST and single lap joint tests. The predictions made by the models are close to the experimental results and therefore validate the implemented numerical approach
2
Dufour, Ludovic. "Caractérisation et modélisation du collage structural multi-matériaux sous sollicitation dynamique." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0012/document.
Full textAbstract:
Les matériaux composites sont depuis plusieurs décennies un domaine d’innovation dans le contexte de l’allégement des structures. Néanmoins, ils subsistent encore certains points d’amélioration concernant l’assemblage de ceux-ci entre eux ou sur des pièces métalliques. Le collage dit « structural » est alors une technologie incontournable pour l’assemblage de structure multi-matériaux. L’intégration du collage dans le processus de développement et de dimensionnement des structures requiert l’utilisation de modèles numériques adaptés ainsi qu’une approche de caractérisation fiable. De plus, dans le domaine du crash (code explicite), le modèle doit être compatible avec les contraintes de temps de calcul. Ces travaux de thèse proposent de définir une démarche de caractérisation et de modélisation des assemblages par collage soumis à des sollicitations dynamiques. L’objectif final est de proposer un modèle capable de simuler des structures sous sollicitations de types crash. Pour cela, un modèle phénoménologique (modèle à l’échelle mésoscopique) est caractérisé à l’aide d’essai de type bulk. Ce modèle permet une description fine du champ mécanique au sein d’un assemblage. Ce modèle combiné avec des essais réalisés sur un dispositif de type Arcan spécialement adapté pour des sollicitations dynamiques permet une identification d’un critère de rupture intrinsèque. À l’aide de ce modèle et du critère de rupture, un élément cohésif (modèle à l’échelle macroscopique) compatible avec les contraintes de temps de calcul est identifié. Finalement, ce modèle est validé par des essais dynamiques de sous-structure multi-matériauxSince few decades, composite material is an innovative field for the reduction of structure weight. However, assemblies of composite together or with metallic part are still a challenging point. Structural bonding is an unavoidable technology for the assemblies of multi-materials structures. Within the development and dimensioning procedure, the use of bonding requires the definition of numerical models and characterization methods. Furthermore, in crashworthiness (explicit code), models must be in agreement of time calculation limitations. The present work propose to define a modelling and characterisation approach for bonding assemblies under dynamic loading. The final aim is to provide a model able to modelling multi-materials structure under crash loading. For it, a characterisation of a phenomenological model (mesoscopic scale) is proposed. This model allow a fine description of the mechanical field in the bonded joint. With test carried out with an Arcan test device specially developed for dynamic loading, the mesoscopic model is used for the identification of an intrinsic failure criteria. Using mesoscopic model and the intrinsic failure criteria, a cohesive model (macroscopic model) in agreement of time calculation limitations is identified. Finally, this model is validated through dynamic tests on multi-materials substructures
3
Tchalla, Tatiana Siwavi. "Durabilité d'assemblages métal/élastomère en milieu marin." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0121/document.
Full textAbstract:
Dans des contextes industriels spécifiques, coller un revêtement épais élastomère à des canalisations en acier constitue le meilleur moyen de les protéger de la corrosion en milieu marin. Ce travail de thèse a principalement pour objectif de mieux appréhender le comportement à long terme de ces assemblages acier/colle/revêtement en milieu marin. Deux approches complémentaires ont été définies. La première se base sur des outils statistiques pour traiter les données de caractérisations physico-chimiques des matériaux issus des assemblages utilisés en service depuis plus de trente ans. A partir de ces données hétérogènes (les assemblages sont différents en termes de formulations des matériaux, de procédé de collage et de conditions de vieillissement); des groupes homogènes présentant des scénarios de vieillissement identiques ont été identifiés et les mécanismes majeurs de dégradation du revêtement ont été établis. La seconde approche se focalise sur les assemblages actuellement utilisés dans les opérations de rénovation. Une démarche expérimentale a donc été mise en place en laboratoire afin d’accélérer de manière contrôlée le vieillissement des matériaux et assemblages. Les objectifs sont multiples. Pour chaque matériau (revêtement et colle), il s’agissait de comprendre les mécanismes de dégradation et les cinétiques d’absorption d’eau qui expliquent les évolutions de propriétés mécaniques et physico-chimiques observées au cours du vieillissement. De même, les interfaces ont été caractérisées et les paramètres de procédé qui influent sur la tenue de l’interface métallique ont été identifiés. Cette approche découplée a permis de mieux comprendre le comportement en milieu marin de l’assemblage d’étude à partir de celui des matériaux et interfaces présentesIn some industrial applications, bonding rubber coatings to metallic pipelines is a suitable solution to protect them from marine corrosion. This study deals with the long term behavior of such metallic coated pipelines in a marine environment. Two different approaches have been developed. The first focuses on degradation data of pipelines used for around thirty years in normal service conditions. As these bonded assemblies are different in terms of material formulations, manufacturing processes and aging conditions, statistical tools were used to identify homogeneous groups with identical aging mechanisms. Also, based on these results, the main degradation mechanisms of the rubber coating were established. The second approach focused on pipelines used currently in renovation operations. An experimental methodology was developed in the laboratory to accelerate aging processes. The bulk materials, surfaces and interfaces were characterized physically, chemically and mechanically before and after natural sea water ageing. This enabled an understanding of the mechanisms and kinetics governing adhesion and degradation to be developed. It also allowed the influence of sea water aging on the failure strength of the assembly of interest to be investigated
4
Bresson, Grégory. "Collage fiable pour l’espace : influence de la qualité des procédés et dimensionnement des assemblages." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14360/document.
Full textAbstract:
L’objectif de ce travail est de qualifier l’utilisation du collage structural en remplacement des solutions d’assemblage conventionnel dans les applications lanceur spatiaux. Si les gains potentiels tant en terme opérationnel qu’en terme de performance ne sont plus à démontrer il reste à mettre en place une démarche de dimensionnement qui garantisse le niveau important de fiabilité requis. Deux adhésifs structuraux de types époxydes ont été étudiés : l’EA9394 et le SW2216. Un travail important d’analyse physico-chimique des surfaces a été mené pour mettre en place un procédé d’assemblage stable et performant. L’analyse mécanique des liaisons collées a montré que l’adhésif subit en situation des sollicitations combinées de traction et de cisaillement. Un dispositif dérivé des essais Arcan à été proposé qui permet d’obtenir la réponse du film de colle sous forme de courbe contrainte déplacement relatif des substrats. La résistance mécanique mesurée au moyen des essais Arcan mais également sur le matériau adhésif montre une forte dispersion liée à un taux de porosité important mais également à une microstructure très hétérogène constituée d’une matrice époxyde et mélangée à des particules d’aluminium (adhésif EA9394). Enfin, le collage a été étudié à une échelle plus macroscopique en tentant de proposer un dimensionnement de liaison pour le lanceur démonstrateur Arcadia. Les lanceurs étant des structures à symétrie de révolution, un modèle semi-analytique de liaison collée axisymétrique a été développé.Ce travail a permis la mise en place d’une démarche d’analyse mettant en avant les analyses à l’échelle du film, de la liaison et de la structure pour mettre en évidence les nombreux phénomènes à l’origine d’une ruine prématurée de la liaison. Cette optimisation multiéchelle doit être conduite pour maximiser la résistance spécifique de la liaison en assurant le niveau de fiabilité requis pour cette application spatialeThe objective of this study is to qualify the use of structural bonding as a replacement for conventional assembly solutions in space launcher applications. Potential benefits in fabrication and of final performance are already known, but it remains to establish a design approach to guarantee the high level of reliability required. Two epoxy structural adhesives have been studied: EA9394 and SW2216. A study of the physico-chemistry of surfaces has been effected in order to find a stable and strong bonding process. Mechanical analysis of bonded connections revealed that the adhesives could be subjected in use to mixed loadings in tension and shear. A device derived from Arcan tests has been proposed in which it is possible to obtain adhesive layer responses as stress/relative deformation for different substrates. Mechanical strength measured with the Arcan device and also on the bulk adhesive material revealed a high variability coming from a significant porosity fraction but also due to a highly heterogeneous microstructure constituted of epoxy matrix and aluminium particles (EA9394adhesive). Bonding has been studied on a macroscopic scale proposing connection design for the demonstration Arcadia launcher. A rocket being an axially symmetrical structure, a semi-analytical model of axisymmetric bonded connections has been developed. This study resulted in the finalisation of an analysis approach pointing to scale analysis of the adhesive layer, connection and structure in order to emphasise the many phenomena which could cause early bond failure. This multiscale approach should be effected to increase specific assembly strength while assuming the required reliability level for this spatial application
5
Devaux, Ophélie. "Analysis and optimization of mixed-mode conical adhesively bonded joints under thermo-mechanical loadings." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0048/document.
Full textAbstract:
Dans I'industrie spatiale, I'optimisation des structures composites du point de vue cycles de fabrication, gain de masse et amélioration des performances passe aujourd'hui par I'introduction de jonctions collées en remplacement/complément de liaisons boulonnées ou rivetées. Les lanceurs sont des structures complexes qui nécessitent de prendre en compte les contraintes liées à la fabrication de structures de grandes tailles, I'influence des conditions de transport et de stockage, ainsi que les différents spectres de chargements thermo-mécaniques rencontrés au cours de la phase de lancement. Le but de ce travail a été de développer un outil prédictif du comportement mécanique de I'adhésif Hysol EA-9321, matériau utilisé dans cette étude, à tout instant du cycle de vie de la structure sur lequel il est utilisé, la structure SYLDA. La caractérisation et la modélisation d'un couplage thermo-cinétique d'un tel adhésif ont tout d'abord été réalisées en vue de déterminer la distribution du taux de polymérisation et de la température dans un assemblage collé quel que soit le chargement thermique appliqué. Le comportement mécanique de l'adhésif a ensuite été étudié expérimentalement via I'essai Arcan Evolution, ce qui a constitué une base de données expérimentales à divers taux de polymérisation adaptée à I'identification du modèle de comportement. Plusieurs modèles élasto-plastique et élasto-visco-plastique basés sur celui de Mahnken-Schlimmer ont été implantés dans un code de calcul éléments finis afin de prédire le comportement 3D de l'adhésif Hysol EA-9321. Une procédure globale d'identification, basée sur un couplage entre calculs éléments finis et une procédure d'optimisation, a permis d'identifier les différents paramètres des lois de comportement. Une extension de ces modèles à la visco-élasticité a été numériquement proposée. Enfin, une comparaison numérique entre une liaison conique et une liaison semblable à celle trouvée sur la structure spatiale étudiée a permis de proposer un essai représentatif du comportement de I'adhésif sur un tel assemblage. Cet essai servira, dans une étude complémentaire, à valider les modèles de comportement développésIn the aerospace industry, composite structures are nowadays optimized with adhesively bonded joints supplemented by/or completed with mechanical fasteners such as bolts, rivets or welds. The structural design of launch vehicles is complex and must take into account lot of constraints related to large-scale structures, influence by environment conditions during storage, transport stages and thermo-mechanical stresses applied during launcher's flight. The purpose of this work was to provide a numerical tool for predicting the mechanical behaviour of the Adhesive Hysol EA-9321 in a spatial bonded assembly such as the SYLDA structure during its life course. First of all, a thermo-kinetic coupling was experimentally and numerically investigated to describe the couple (curing degree-temperature) in a bonded assembly regardless of the thermal load applied. Then, an experimental database was made by studying the mechanical behaviour of the adhesive under proportional loadings, using the Arcan Evolution experimental device. Cure-dependent elastoplastic and elasto-visco-plastic model based on Mahnken-Schlimmer constitutive laws were proposed in order to describe the 3D mechanical behaviour of the adhesive Hysol EA-9321. A global identification strategy allowed identifying material parameters by coupling finite element computations and optimization procedure. An extension of those models to the visco-elasticity was evenly provided. At last, a conical bonded joint and a bonded assembly in the SYLDA structure were numerically compared to propose a test representative of the adhesive behaviour in the SYLDA. The latter will aim at validating the constitutive laws established
6
Tahan, Gilles. "Étude des assemblages collés sous choc - Propriétés mécaniques après choc laser." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2018. http://www.theses.fr/2018ENTA0014.
Full textAbstract:
L’étude présentée s’inscrit dans la suite de travaux effectués lors de différents projets au sein de différents laboratoires concernant le développement d’un essai d’adhésion par choc laser. Le but est de développer une méthode d’évaluation des propriétés mécaniques après choc laser d’un assemblage collé. Il ne s’agira donc pas d’évaluer un niveau d’adhésion à l’aide du choc laser, mais de considérer et d’évaluer l’influence éventuelle d’un choc laser sur les propriétés mécaniques d’un assemblage. Cette étude ne concerne donc que des assemblages sains dont il conviendra d’évaluer les propriétés mécaniques avant et après choc, pour différentes amplitudes dans la gamme de pression usuelle de la méthode LASAT (LASer Adhesion Test). Cette caractérisation d’assemblages passe par le choix d’une méthode adaptée aux joints de colle, capable de prendre en compte les spécificités liées à la géométrie du substrat, mais aussi de générer un champ de contraintes souhaité. La méthode retenue est l’essai mécanique ARCAN, capable d’évaluer la tenue d’un assemblage collé sous sollicitations quasi-statiques, en traction, en cisaillement ou mixtes. En outre, l’essai ARCAN permet l’identification de lois de comportements des joints de colle. De même, il est possible de caractériser les lamelles composites dans leur comportement hors plan. Ce travail a été réalisé à l’Institut de recherche Dupuy de Lôme (IRDL), sur le site de l’ENSTA Bretagne (Brest), en partenariat avec Engie Ineo dont l’activité, la construction de radômes en matériaux composites, est concernée par les questions de contrôle des assemblages collés. Ces travaux ont aussi été l’occasion d’une collaboration avec le CEA DAM DIF qui a mis à disposition le code de simulation d’interaction laser - matière ESTHERThe study presented follows on from the work carried out during different projects in different laboratories concerning the development of a laser shock adhesion test. The goal is to develop a method for evaluating the mechanical properties after laser impact of a bonded assembly. It will therefore not be a question of evaluating a level of adhesion using laser shock, but of considering and evaluating the possible influence of a laser shock on the mechanical properties of an assembly. This study therefore only concerns healthy assemblies, the mechanical properties of which should be evaluated before and after impact, for different amplitudes in the usual pressure range of the LASAT method (LASer Adhesion Test). This characterization of assemblies involves the choice of a method suitable for adhesive joints, capable of taking into account the specificities linked to the geometry of the substrate, but also of generating a desired stress field. The method adopted is the ARCAN mechanical test, capable of evaluating the resistance of a bonded assembly under quasi-static stresses, in tension, in shear or mixed. In addition, the ARCAN test allows the identification of behavioral laws of adhesive joints. Likewise, it is possible to characterize the composite lamellae in their out-of-plane behavior. This work was carried out at Institut de Recherche Dupuy de Lôme (IRDL), on ENSTA Bretagne site (Brest), in partnership with Engie Ineo whose activity, the construction of radomes in composite materials, is concerned with questions of control of bonded assemblies. This work was also the occasion of a collaboration with the CEA DAM DIF which made available ESTHER laser - material interaction simulation code
7
Alfonso, Medina Hugo Leonardo. "Caractérisation et modélisation des assemblages multi-matériaux sous sollicitations mixtes quasi-statiques pour la conception des structures automobiles." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0118/document.
Full textAbstract:
Durant ces dernières années, les émissions de CO2 liées à l’utilisation des voitures ont atteint des niveaux critiques contribuant au réchauffement climatique et causant des problèmes de santé. Afin de réduire ces émissions, l’industrie automobile française a décidé de réduire la masse des véhicules via l’utilisation de matériaux plus légers tels que les matériaux composites. Cependant, les techniques d'assemblage classiquement utilisées ne sont pas compatibles pour assembler ces nouveaux matériaux à la structure du véhicule (acier et aluminium). Le principal objectif de cette étude a donc été la caractérisation et la modélisation de nouvelles techniques d'assemblages multimatériaux permettant une bonne résistance mécanique.Quatre techniques d’assemblages multi-matériaux (métal/composite) ont été étudiées : (i) le collage par goujon, (ii) la soudure laser, (iii) le rivetage auto-perçant et (iv) le collage. Des essais traditionnels de simple recouvrement et de traction transverse ont été utilisés pour caractériser les deux premières techniques. Ensuite, un nouveau test de caractérisation basé sur un dispositif Arcan modifié a été proposé pour analyser le comportement des assemblages rivetés et le collage. Parmi les quatre techniques testées, le collage a été retenu comme la technique la plus adaptée aux exigences de l'industrie. Par conséquent, des essais Arcan ont été réalisés afin de déterminer le comportement quasi-statique des adhésifs de l’étude (Betamate1822 et Sikapower498). Ces essais ont ensuite été utilisés pour proposer et identifier une nouvelle loi de comportement 3D viscoélastique spectrale non-linéaire. La procédure d'identification des paramètres des adhésifs n'est basée que sur trois essais de fluage multiniveaux, permettant un dimensionnement rapide des structures collées. Enfin, la loi de comportement proposée a été validée grâce à la bonne corrélation entre les prédictions numériques et les courbes expérimentales des essais monotones à différents vitesses de sollicitation et des essais de traction incrémentale.La présente étude a été développée dans le cadre d’un projet automobile. Néanmoins, les conclusions et les perspectives de l'étude peuvent être extrapolées à d'autres domaines tout aussi intéressantsNowadays, the emissions of CO2 due to the use of automobiles have reached critical levels causing global warming and health problems. In order to reduce these emissions, the French automotive industry has decided to reduce the car weight by means of the use of lighter materials such as composite materials. However, the classical joining techniques are not adapted to assembly these new materials to the structure of the car (aluminum and steel alloys). Therefore, the characterization and modeling of new joining techniques of dissimilar materials is a problem that has been treated in the current study.Four different joining techniques of dissimilar materials (metal/composite) have been studied: (i) stud bonding, (ii) laser welding, (iii) self-pierce riveting and (iv) adhesive bonding systems. Traditional lap-shear and cross-tension tests were used to characterize the first two joining techniques. Then, a new characterization test based on a modified Arcan device has been proposed to analyze the behavior of self-piercing rivet and adhesive bonding systems. Among all the four tested techniques, adhesive joints have been selected as the most adapted technique according to the requirements of the industry. Therefore, modified Arcan tests have been performed in order to determine the behavior of the adhesives of the study (Betamate1822 and Sikapower498). These tests were then used to propose and identify a new 3D non-linear viscoelastic spectral model. The identification procedure of the material parameters is only based on three multilevel creep tests, which permits the rapid dimensioning of adhesively bonded structures. Finally, the proposed behavior law was validated by the good concordance between the numerical predictions and the experimental curves of monotonic tests at different loading rates and increasing cyclic tests.The current study was developed in the framework of an automotive project. Nevertheless, the conclusions and prospects of the study can be extrapolated to other interesting fields
8
Melo, Daniel Araújo. "ARCA - Alerts root cause analysis framework." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/13946.
Full textAbstract:
Submitted by Luiza Maria Pereira de Oliveira (luiza.oliveira@ufpe.br) on 2015-05-15T14:58:14Z
No. of bitstreams: 2
license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
DISSERTAÇÃO Daniel Araújo Melo.pdf: 2348702 bytes, checksum: cdf9ac0421311267960355f9d6ca4479 (MD5)Made available in DSpace on 2015-05-15T14:58:14Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Daniel Araújo Melo.pdf: 2348702 bytes, checksum: cdf9ac0421311267960355f9d6ca4479 (MD5) Previous issue date: 2014-09-08
Modern virtual plagues, or malwares, have focused on internal host infection and em-ploy evasive techniques to conceal itself from antivirus systems and users. Traditional network security mechanisms, such as Firewalls, IDS (Intrusion Detection Systems) and Antivirus Systems, have lost efficiency when fighting malware propagation. Recent researches present alternatives to detect malicious traffic and malware propagation through traffic analysis, however, the presented results are based on experiments with biased artificial traffic or traffic too specific to generalize, do not consider the existence of background traffic related with local network services or demands previous knowledge of networks infrastructure. Specifically don’t consider a well-known intru-sion detection systems problem, the high false positive rate which may be responsible for 99% of total alerts. This dissertation proposes a framework (ARCA – Alerts Root Cause Analysis) capable of guide a security engineer, or system administrator, to iden-tify alerts root causes, malicious or not, and allow the identification of malicious traffic and false positives. Moreover, describes modern malwares propagation mechanisms, presents methods to detect malwares through analysis of IDS alerts and false positives reduction. ARCA combines an aggregation method based on Relative Uncertainty with Apriori, a frequent itemset mining algorithm. Tests with 2 real datasets show an 88% reduction in the amount of alerts to be analyzed without previous knowledge of network infrastructure.
9
Yan, Jack. "Simulation Method Development of Ultra Thick Laminates: : with Cohesive Zone Method and Empirical Arcan Tests." Thesis, KTH, Lättkonstruktioner, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48716.
Full textAbstract:
To reduce the product life cost of aircrafts, the conversion of major load bearing components from aluminium to carbon fibre reinforced plastics have been proposed. Large load bearing components require significantly thicker composite laminates than conventional. These ‘Ultra-Thick Laminates’ require studies into the out-of-plane behavioural and material properties before it can be used commercially. Cohesive Zone Modelling and Arcan empirical testing are chosen to help investigate these properties and behaviour of Ultra Thick Laminates. The Cohesive Zone Modelling method in the commercial FE-software, MSC.Marc Mentat, is validated by comparing results with standardized thin coupon tests prior to further simulation. Arcan tests are to provide material properties to improve accuracy of simulations. However, Arcan test rigs designed prior to the start of this thesis was not suitable for providing correct data and adjustments to the test rigs are needed. Alternatives to the Arcan test have been proposed and considerations of these tests are underway. Nevertheless, Cohesive Zone Modelling is applied to a realistic Ultra Thick Laminates component with the available material properties to provide context. The Cohesive Zone Modelling has shown to be accurate at predicting the behaviour of delamination onset, but the load-displacement predictions were not as accurate in the Ultra Thick Laminates component as in the Cohesive Zone Modelling validations. The sources of discrepancies in results are conceptualized and the Cohesive Zone Modelling remains a viable and potentially powerful method in delamination analysis. However, more development is required in the implementation of Cohesive Zone Modelling for larger components, such as Ultra Thick Laminates components, for Cohesive Zone Modelling to become a robust and standard analytical practice.
10
Azari, Leila. "Domain Specific Modeling Support for ArCon." Thesis, Linköpings universitet, Programvara och system, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-102687.
Full textAbstract:
One important phase in software development process is to create a design model of the system which follows all the architectural rules. Often the architectural rules are defined by the system architect and the system model is designed by the system designer. The architect defines the rules in a text file where no standard or pattern is followed. Therefore, there is always the risk of violating the architectural rules by the designer. So manual reviews on the system model should be done by the architect to ensure the system model is valid.In order to remove this manual checking which can be erroneous and time consuming ArCon (Architecture Conformance Checker) was developed by Combitech AB. ArCon is a tool which lets the architect define the architectural rules in the format of UML (Unified Modeling Language) models where the elements of the model have different meaning than the standard UML. ArCon can read this model and extract architectural rules from it and check the system model against those rules and then print all the rule violations.ArCon is an open source tool i.e. free for everyone to download and use. Currently, it supports Papyrus as the UML modeling tool. Papyrus is integrated to Eclipse platform and is a general purpose modeling tool. It supports users with all types of UML diagrams and elements.The idea for this thesis work was to implement a new feature for ArCon in order to facilitate the design process for system designers. The feature should provide the system designers only those types of elements which they are permitted to add to a specific fraction of the system model. The list of permitted element types should be extracted from the architecture model where all the architectural rules are defined in advance. This new support in ArCon was named Domain Specific Modeling (DSM) support.To evaluate the effect of DSM support on the system designers performance a few test sessions, called usability tests, were performed. The participants in the test sessions were a representative sample of software designers. After analyzing the data collected from the test sessions, the pros and cons of the new support were discovered. Furthermore, a few new ideas for enhancing DSM support were generated.
Books on the topic "Arcan test"
1
Davis, Cole. SPSS for Applied Sciences. CSIRO Publishing, 2013. http://dx.doi.org/10.1071/9780643107113.
Full textAbstract:
This book offers a quick and basic guide to using SPSS and provides a general approach to solving problems using statistical tests. It is both comprehensive in terms of the tests covered and the applied settings it refers to, and yet is short and easy to understand. Whether you are a beginner or an intermediate level test user, this book will help you to analyse different types of data in applied settings. It will also give you the confidence to use other statistical software and to extend your expertise to more specific scientific settings as required.
The author does not use mathematical formulae and leaves out arcane statistical concepts. Instead, he provides a very practical, easy and speedy introduction to data analysis, offering examples from a range of scenarios from applied science, handling both continuous and rough-hewn data sets.
Examples are given from agriculture, arboriculture, biology, computer science, ecology, engineering, farming and farm management, hydrology, medicine, ophthalmology, pharmacology, physiotherapy, spectroscopy, sports science, audiology and epidemiology.
2
R. Larsen, Kai, and Daniel S. Becker. Automated Machine Learning for Business. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190941659.001.0001.
Full textAbstract:
In Automated Machine Learning for Business, we teach the machine learning process using a new development in data science: automated machine learning. AutoML, when implemented properly, makes machine learning accessible to most people because it removes the need for years of experience in the most arcane aspects of data science, such as the math, statistics, and computer science skills required to become a top contender in traditional machine learning. Anyone trained in the use of AutoML can use it to test their ideas and support the quality of those ideas during presentations to management and stakeholder groups. Because the requisite investment is one semester-long undergraduate course rather than a year in a graduate program, these tools will likely become a core component of undergraduate programs, and over time, even the high school curriculum.
3
McDonald, Grantley. The Johannine Comma from Erasmus to Westminster. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198806837.003.0003.
Full textAbstract:
This chapter reconstructs the way early sixteenth-century humanists dealt with a textual corruption in the biblical text, the Comma Johanneum (1 John 5:7–8). The passage served as locus probandi for the doctrine of Holy Trinity, but before the fourteenth century it did not appear in versions of the New Testament other than the Latin Vulgate. In his Greek edition of the New Testament (1516) Erasmus noted the absence of the Comma and consequently omitted the passage. Critics accused him of promoting Arian heresy and promptly presented him with a Greek codex which did contain the contested lines. Besides the origin of this ‘Codex Montfortianus’, the debates caused by Erasmus’ edition are described in order to show how the passage remained a raw nerve for Roman Catholic and Reformed orthodoxy.
4
van Miert, Dirk. The Emancipation of Biblical Philology in the Dutch Republic, 1590-1670. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198803935.001.0001.
Full textAbstract:
This book argues that the application of tools, developed in the study of ancient Greek and Latin authors, to the Bible aimed to stabilize the biblical text but had the unintentional effect that the text grew more and more unstable. Spinoza capitalized on this tradition in his notorious Theological-Political Treatise, published in the Dutch Republic in 1670. But the foundations on which his radical biblical scholarship is built were laid by Reformed philologists who started from the hermeneutical assumption that philology was the maidservant of reformed dogma. On this basis, they pushed biblical scholarship to the centre of historical studies during the first half of the seventeenth century. The monograph shows how Jacob Arminius, Franciscus Gomarus, the translators and revisers of the States’ Translation (the Dutch Authorized Version), Daniel Heinsius, Hugo Grotius, Claude Saumaise, Isaac de La Peyrère, and Isaac Vossius all drew on techniques developed by classical scholars of Renaissance humanism, notably Joseph Scaliger, who devoted themselves to the study of manuscripts, (oriental) languages, and ancient history. These scholars’ accomplishments in textual criticism, the analysis of languages, and the reconstruction of political and cultural historical contexts are assessed and compared, and it is demonstrated that their methods were closely linked. Apart from this internal analysis, the book considers the external development of biblical philology. It became the cutting-edge science of the day and grew from an arcane research specialism into a fashionable science for scholars who wanted to share in the fame of being a universal critic.
5
Super NES Games Secrets, Greatest Tips. Prima Publishing, 1993.
Book chapters on the topic "Arcan test"
1
McHughen, Alan. "Genetic Genealogy." In DNA Demystified. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190092962.003.0010.
Full textAbstract:
We discussed genealogy DNA tests in Chapter 8. Here we focus on some practical matters to aid your engagement with genetic genealogy. We’ll survey which company you might choose for conducting your DNA test(s), explain how to interpret your results, and answer some common questions posed by genetic genealogy beginners (and even by some more advanced practitioners, too). Before seeking a company, identify what you hope to achieve. Different companies offer different types of tests, which reveal different genetic features and answer different questions, so knowing what you want to get from a DNA test will then allow you to choose from a list of companies offering that feature. Once you have a short list of suitable companies, you can choose based on practical criteria—price, convenience, appeal of website and presentation of data, privacy policy, and other factors. When you receive the results, you may want some help in interpreting the data and in identifying “matches,” your close and distant DNA relatives. We’ll also discuss a recommended free site, Gedmatch, and offer help for adoptees and others lacking known biological connections. In the latter half of the chapter we’ll explain some of the arcane terminology and address some common misconceptions encountered in the genetic genealogy community.
2
Anderson, David. "Iain Sinclair’s Early Writing." In Landscape and Subjectivity in the Work of Patrick Keiller, W.G. Sebald, and Iain Sinclair. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198847199.003.0006.
Full textAbstract:
Chapter 5, ‘Iain Sinclair’s Early Writing: The Arcane Scholarship of Place’, begins by exploring the special influence of an eccentric 1914 text by Elizabeth Gordon entitled Prehistoric London: Its Mounds and Circles (1914) on Sinclair’s occult-inflected poetic geographies of London. Examining his creative exchanges with other writers, including Peter Ackroyd and Alan Moore, it explores the coterie atmosphere of Sinclair’s early work before going on to navigate his increasingly venomous and toxic vision of East London and the Thames Estuary in the period spanning 1970 to 1994, adumbrating and critiquing the parallel development of what Patrick Wright has called the ‘acid negativity’ of Sinclair’s prose.
3
Morales, Ángel Fabián Campoya, Juan Luis Hernández Arellano, and Elvia Luz González-Muñoz. "Combined Methods for Physical and Mental Workload." In Advances in Psychology, Mental Health, and Behavioral Studies. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1052-0.ch001.
Full textAbstract:
This chapter presents information about the methods that combine physical and mental workload/fatigue during ergonomic evaluation. The methods were identified through a systematic literature review. The search criteria were done through a literature search in databases like SciFinder, SciELO, ScienceDirect, etc. As result, the following methods are described: Global Load Scale, Multivariate Workload Assessment, Subjective Fatigue Symptoms Test, Fatigue Assessment Scale, Scale of Recovery for Exhaustion of Occupational Fatigue, Scale of Estimated Fatigue-Energy Points, Swedish Occupational Fatigue Inventory, NASA-TLX, Combined Cognitive and Physical Assessment, Laboratory Method of Economics and Sociology of Work, OWL Method, Ergonomic Checklist Method, RENAULT Method, Joyce Method, NERPA Method, ARBAN Method, and MAPFRE Method. As a conclusion, it is possible to affirm that there are some evaluation methods that provide better elements for an accurate evaluation, and others lack basic elements, which causes an incomplete/not accurate evaluation.
4
Morales, Ángel Fabián Campoya, Juan Luis Hernández Arellano, and Elvia Luz González-Muñoz. "Combined Methods for Physical and Mental Workload." In Research Anthology on Changing Dynamics of Diversity and Safety in the Workforce. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-2405-6.ch028.
Full textAbstract:
This chapter presents information about the methods that combine physical and mental workload/fatigue during ergonomic evaluation. The methods were identified through a systematic literature review. The search criteria were done through a literature search in databases like SciFinder, SciELO, ScienceDirect, etc. As result, the following methods are described: Global Load Scale, Multivariate Workload Assessment, Subjective Fatigue Symptoms Test, Fatigue Assessment Scale, Scale of Recovery for Exhaustion of Occupational Fatigue, Scale of Estimated Fatigue-Energy Points, Swedish Occupational Fatigue Inventory, NASA-TLX, Combined Cognitive and Physical Assessment, Laboratory Method of Economics and Sociology of Work, OWL Method, Ergonomic Checklist Method, RENAULT Method, Joyce Method, NERPA Method, ARBAN Method, and MAPFRE Method. As a conclusion, it is possible to affirm that there are some evaluation methods that provide better elements for an accurate evaluation, and others lack basic elements, which causes an incomplete/not accurate evaluation.
5
Thrush, Coll. "The Unhidden City." In Indigenous London. Yale University Press, 2016. http://dx.doi.org/10.12987/yale/9780300206302.003.0001.
Full textAbstract:
This chapter adds to the canon of secret Londons through the inscription of another layer, another arcane and invisible text in the palimpsest that is the urban landscape. Such accounts of other Londons gesture toward the irreducible survivals of past landscapes in a place that constantly unearths its own history. As stated by Prof. Timothy Morton, “the streets beneath the streets, the Roman Wall, the boarded-up houses, the unexploded bombs, are records of everything that happened to London.” London's history exists in its form. From histories of the Underground to accounts by urban explorers entering the city's sewers and crypts, from compendia of obscure folklore to catalogs of nearly forgotten ghost stories, London provokes a predilection with the hidden.
6
Freixes, A., M. Monterde, and J. Ramoneda. "Tracer tests in the Joèu karstic system (Aran Valley, Central Pyrenees, NE Spain)." In Tracer Hydrology 97. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078142-38.
Full text
7
Podro, Michael. "Ernst Hans Josef Gombrich 1909–2001." In Proceedings of the British Academy, Volume 120, Biographical Memoirs of Fellows, II. British Academy, 2003. http://dx.doi.org/10.5871/bacad/9780197263020.003.0009.
Full textAbstract:
Ernst Gombrich was a prominent art historian in the UK and probably its best known humanist scholar during the last forty years of the 20th century. The status derived from two apparently unrelated features of his work: he wrote deliberately for a wide audience, most obviously in his highly successful Story of Art first published in 1950, while his standing in the academic world, both within and beyond the field of art history, was established by Art and Illusion published in 1960; here he reconstructed some of the basic concepts in which the development of the visual arts could be discussed, introducing into the literature of art history a greatly enriched understanding of perceptual psychology. The two factors — his address to a general audience and his conceptual innovations in Art and Illusion — were intimately related because his use of experiments from the perceptual psychologists, appealing to effects which his readers and lecture audiences could test on themselves, lessened the sense that art was an arcane activity isolated from our everyday world.
8
Mortimer, Sarah. "The Science of Politics." In Reformation, Resistance, and Reason of State (1517-1625). Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199674886.003.0011.
Full textAbstract:
In 1576 Louis Le Roy published a new and expanded edition of his translation of Aristotle’s Politics. In the late-sixteenth century, the starting point for academic political reflection remained the Politics, a text which underlined the importance of participation in the constitution. Although Bodin’s alternative concept of sovereignty was widely admired, many readers were troubled by Bodin’s political and religious ideas and wanted to preserve a role for the Aristotelian idea of political justice and for the Church. The effect was a revitalization of politics as an academic disciple or science, in which the civil community was examined alongside the Church. Leading figures in this process include John Case and Richard Hooker in England and Pierre Grégoire in France. In Emden, Johannes Althusius developed a political theory which he described as a reworking of Aristotle; he emphasized the concept of ‘consociation’ and used it to defend the sovereignty of the people. Henning Arnisaeus challenged Althusius’s claims, preferring to see sovereignty as divisible, shared in the Holy Roman Empire between the Emperor and the Princes, and requiring the use of arcana imperii or secrets of state. This chapter shows that the Aristotelian tradition remained important as a way of portraying a hierarchically organized political society as natural to human beings, but that in the wake of Bodin’s writing there was a shift in emphasis away from questions of virtue and distributive justice and towards a discussion of the nature of sovereign power.
9
Pool, Robert. "Business." In Beyond Engineering. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195107722.003.0008.
Full textAbstract:
In January 1975, the magazine Popular Electronics trumpeted the beginnings of a revolution. “Project Breakthrough,” the cover said: “World’s First Minicomputer Kit to Rival Commercial Models.” Inside, a six-page article described the Altair, an unassembled computer that could be ordered from MITS, a company in Albuquerque originally founded to sell radio transmitters for controlling model airplanes. To the uninitiated, it didn’t look like much of a revolution. For $397 plus shipping, a hobbyist or computer buff could get a power supply, a metal case with lights and switches on the front panel, and a set of integrated circuit chips and other components that had to be soldered into place. When everything was assembled, a user gave the computer instructions by flipping the panel’s seventeen switches one at a time in a carefully calculated order; loading a relatively simple program might involve thousands of flips. MITS had promised that the Altair could be hooked up to a Teletype machine for its input, but the circuit boards needed for the hookup wouldn’t be available for a number of months. To read the computer’s output, a user had to interpret the on/off pattern of flashing lights; it would be more than a year before MITS would offer an interface board to transform the output into text or figures on a television screen. And the computer had no software. A user had to write the programs himself in arcane computer code or else borrow the efforts of other enthusiasts. One observer of the early computer industry summed up the experience like this: “You buy the Altair, you have to build it, then you have to build other things to plug into it to make it work. You are a weird-type person. Because only weird-type people sit in kitchens and basements and places all hours of the night, soldering things to boards to make machines go flickety-flock.” But despite its shortcomings, several thousand weird-type people bought the Altair within a few months of its appearance. What inspired and intrigued them was the semiconductor chip at the heart of the computer.
Conference papers on the topic "Arcan test"
1
Yang, Dongyang, Benoit Stalin, Yong Xia, and Qing Zhou. "Identification of Shear Properties for Woven Fiber Reinforced Polymer Simulation." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66263.
Full textAbstract:
Finite element simulation of composite materials is still challenging as anisotropy of the material brings difficulty in accurately identifying shear properties for modeling. In this study, ±45° tensile tests, Iosipescu shear tests, rail shear tests and Arcan shear tests are conducted to obtain the engineering shear stress-strain curve of woven fiber reinforced polymer. Digital image correlation method is adopted to obtain the strain field of the specimens. It is indicated that Iosipescu shear tests introduce a strain field close to pure shear state while the other three test types introduce relatively large tensile strain or compressive strain. Shear properties obtained from Iosipescu tests are used to calibrate an extensively used composite material model, Matzenmiller-Lubliner-Taylor (MLT) model. The calibrated MLT model is then verified by simulating Arcan tests with different loading angles. The simulations indicate that MLT model gives reliable predictions on Arcan tests with smaller loading angles, while it overestimates the force-displacement responses at larger loading angles.
2
Her, Remy, Jacques Renard, Vincent Gaffard, Yves Favry, and Paul Wiet. "Design of Pipeline Composite Repairs: From Lab Scale Tests to FEA and Full Scale Testing." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33201.
Full textAbstract:
Composite repair systems are used for many years to restore locally the pipe strength where it has been affected by damage such as wall thickness reduction due to corrosion, dent, lamination or cracks. Composite repair systems are commonly qualified, designed and installed according to ASME PCC2 code or ISO 24817 standard requirements. In both of these codes, the Maximum Allowable Working Pressure (MAWP) of the damaged section must be determined to design the composite repair. To do so, codes such as ASME B31G for example for corrosion, are used. The composite repair systems is designed to “bridge the gap” between the MAWP of the damaged pipe and the original design pressure. The main weakness of available approaches is their applicability to combined loading conditions and various types of defects. The objective of this work is to set-up a “universal” methodology to design the composite repair by finite element calculations with directly taking into consideration the loading conditions and the influence of the defect on pipe strength (whatever its geometry and type). First a program of mechanical tests is defined to allow determining all the composite properties necessary to run the finite elements calculations. It consists in compression and tensile tests in various directions to account for the composite anisotropy and of Arcan tests to determine steel to composite interface behaviors in tension and shear. In parallel, a full scale burst test is performed on a repaired pipe section where a local wall thinning is previously machined. For this test, the composite repair was designed according to ISO 24817. Then, a finite element model integrating damaged pipe and composite repair system is built. It allowed simulating the test, comparing the results with experiments and validating damage models implemented to capture the various possible types of failures. In addition, sensitivity analysis considering composite properties variations evidenced by experiments are run. The composite behavior considered in this study is not time dependent. No degradation of the composite material strength due to ageing is taking into account. The roadmap for the next steps of this work is to clearly identify the ageing mechanisms, to perform tests in relevant conditions and to introduce ageing effects in the design process (and in particular in the composite constitutive laws).
3
Khadka, Nitesh, Mir Ragib Ishraq, Asif Mohammed Samir, and Mohammad Shahidur Rahman. "Multilingual Text Categorization of Indo-Aryan Languages." In 2019 International Conference on Electrical, Computer and Communication Engineering (ECCE). IEEE, 2019. http://dx.doi.org/10.1109/ecace.2019.8679445.
Full text
4
Deng, Xiaomin, and Michael A. Sutton. "Experiments, Analysis and Simulation of Mixed Mode Ductile Fracture." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71384.
Full textAbstract:
This paper provides a review of findings of a comprehensive research effort by the authors and collaborators in the area of experiments, analysis and simulation of mixed-mode ductile fracture. Topics include mixed-mode Arcan stable tearing tests, the mixed-mode CTOD fracture criterion and its basis, normalization of ductile crack tip fields, ductile failure envelope, crack tunneling and slanting, effects of stress constraint, custom 2D and 3D mixed-mode crack growth simulation codes, and simulations of mixed-mode stable tearing crack growth tests.
5
Hachour, Kamel, Lydia Sadeg, Djamel Sersab, and Meziane Aberkane. "On the Stress Triaxiality Sensitivity of High Density Polyethylene." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20365.
Full textAbstract:
The aim of this paper is to investigate the stress triaxiality effect on the yield stress for the high density polyethylene (hdpe). An experimental protocol has been established to get a wide range of stress triaxialities (negative and positive). Tensile tests, uniaxial compression and simple shear were performed on specimens with different geometries: notched round bar specimens with different curvature radii, cylindrical specimens and parallelepiped specimens respectively. Biaxial tests (combinations of tensile/compressive and shear loading) are also achieved on butterfly-shaped specimens using an Arcan apparatus in order to expand the stress triaxialities. The experimental results demonstrate that the yield stress depends on the stress triaxiality which is due to the hydrostatic stress influence.
6
Haque, Mohammad Shafinul, Edel Arrieta, Jorge Mireles, Cesar Carrasco, Calvin M. Stewart, and Ryan B. Wicker. "Mechanical Behavior and Microstructure of Electron Beam Melted Ti-6Al-4V Using Digital Image Correlation." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66178.
Full textAbstract:
The reputation of additive manufacturing technology has increased dramatically in recent years due to its freedom of design, customization, and waste minimization. The growing demand for complex profile components to achieve more economic and strength-to-weight efficient aero-engine components can be met by additive manufacturing technology. In this study, electron beam melting (EBM), a powder bed additive layer manufacturing process, is used to manufacture Ti-6Al-4V tensile specimens. The Ti-6AL-4V alloy has excellent corrosion and high temperature resistance with a high strength-to-weight ratio. It is widely used in the power generation, aerospace, and medical industries. An Arcam Ti-6Al-4V prealloyed powder with particle sizes ranging from 45μ–100μ is used in an Arcam A2 machine to manufacture three specimens at zero degree manufacturing orientation. The zero degree manufacturing orientation is expected to exhibit a higher strength over other orientations. The EBM manufacturing parameters were set at 15mA current and 4530 mm/sec beam speed. Tensile tests were performed at room temperature (25.5°C) under a strain rate of 0.003 mm/mm/min according to the ASTM E8 standard for strain-rate sensitive materials. Stress-strain curves are plotted and discussed. Tensile test results indicate a tensile strength of 1.2 GPa and an elongation of 8% approximately. Three Dimensional Digital Image Correlation (3D-DIC) is used to measure the full strain field and deformation evolution on the surface of the specimens. The 3D-DIC system compares digital photographs (taken at two different angles simultaneously) of the surface of a specimen and calculates the deformation and strain fields. Using the strain fields the mechanical properties are determined by the relationships in the strain tensor. The tensile test results show that for a zero degree manufacturing orientation, the yield strength (YS) and ultimate tensile strength (UTS) are higher than that typically reported for wrought products. Fractography using optical microscopy (OM) and Scanning Electron Microscopy (SEM) were conducted. Micrographs of transverse section of the specimen were obtained to identify and analyze the failure mechanism that took place during testing. The built direction, presence of voids, manufacturing defects, and unmelted particles are observed from the SEM views. Surface roughness and microstructure were observed in the OM. A comparison of the obtained results with the literature for additively manufactured Ti-6Al-4V and possible causes are discussed.
7
Anani, Nader A., Omar A. Al-Kharji, Prasad V. Ponnapalli, Saleh R. Al-Araji, and Mahmoud A. Al-Qutayri. "Synchronization of a Single-Phase Photovoltaic Generator With the Low-Voltage Utility Grid." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54951.
Full textAbstract:
The increased generation of electrical energy from renewable sources and its integration into the low voltage grid, has necessitated regulations governing the connection of renewable energy generators to the grid. This was deemed necessary to preserve the integrity and the correct operation of the grid. This paper presents a new architecture of a hybrid phase lock loop circuit topology for synchronizing a single-phase inverter fed from a renewable energy source such as a photovoltaic (PV) generator to the low voltage grid. The system uses a digital phase lock loop (DPLL) architecture, which is based on the arctan phase detector, driving a phase lock loop (PLL) to synchronize a PV generator with the grid voltage. The proposed system has been tested by simulation using Simulink/Matlab. The test results demonstrate the ability of the system to synchronize a PV inverter with the grid and to re-establish synchronization following a sudden perturbation in the grid voltage such as a single or a multi-step change in phase.
8
Bol, Eric, and M. Ramulu. "Repeatability of a Topology Optimized Tapered Box Beam Additively Manufactured With Electron Beam Melted Ti-6Al-4V." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24352.
Full textAbstract:
Abstract In order for metal additive manufacturing to fully break into the commercial aircraft industry the process has to be stable and repeatable. The product safety of high-quality serial production components is directly related to manufacturing repeatability. In this study a tapered box beam resembling a scaled down commercial aircraft engine pylon forward strut box is designed for additive manufacturing using 3D topology optimization as a guide. The topology optimization algorithm initially sized the structure for maximum stiffness, then the resulting CAD model was redesigned and analyzed for maximum principal stress to reduce the weight. The final design had an asymmetric organic-like truss structure that was manufactured in two halves out of titanium using an Arcam A2X electron beam powder bed fusion machine. A trial build helped to determine the proper support strategy to achieve quality specimens with tight tolerances that would facilitate assembly. To test the manufacturing repeatability a series of three builds was executed to produce six beam specimens for follow-on analysis and strength testing. This paper describes the design, analysis, and manufacturing process for a topology optimized taped box beam that is intended for future ultimate strength testing and analysis.