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Dissertations / Theses on the topic 'Plastic slip'

Author: Grafiati

Published: 13 July 2024

Last updated: 31 July 2025

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1

Lloyd, Jeffrey Townsend. "Implications of limited slip in crystal plasticity." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34808.

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To better understand consequences of classical assumptions regarding deformation mechanisms at the mesoscale, experimental observations of mesoscale deformation are presented. In light of actual micrographics of deformed polycrystals, the Von Mises criterion which states that 5 independent plastic deformation sources are needed at each material point to satisfy compatibility is studied, and the consequences of violating this assumption are presented through comprehensive parametric studies. From these studies, it can be concluded that not only are 5 independent plastic deformation sources not

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2

Bayerschen, Eric [Verfasser]. "Single-crystal gradient plasticity with an accumulated plastic slip: Theory and applications / Eric Bayerschen." Karlsruhe : KIT Scientific Publishing, 2016. http://www.ksp.kit.edu.

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3

Chaloupka, Ondrej. "Modelling evolution of anisotropy in metals using crystal plasticity." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8435.

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Many metals used in modern engineering exhibit anisotropy. A common assumption when modelling anisotropic metals is that the level of anisotropy is fixed throughout the calculation. As it is well understood that processes such as cold rolling, forging or shock loading change the level of anisotropy, it is clear that this assumption is not accurate when dealing with large deformations. The aim of this project was to develop a tool capable to predict large deformations of a single crystal or crystalline aggregate of a metal of interest and able to trace an evolution of anisotropy within the mate

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4

Crooks, Matthew Stuart. "Application of an elasto-plastic continuum model to problems in geophysics." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/application-of-an-elastoplastic-continuum-model-to-problems-in-geophysics(56bc2269-3eb2-47f9-8482-b62e8e053b76).html.

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A model for stress and strain accumulation in strike slip earthquake faults is presented in which a finite width cuboidal fault region is embedded between two cuboidal tectonic plates. Elasto-plastic continuum constitutive equations model the gouge in the fault and the tectonic plates are linear elastic solids obeying the generalised Hooke's law. The model predicts a velocity field which is comparable to surface deformations. The plastic behaviour of the fault material allows the velocities in the tectonic plate to increase to values which are independent of the distance from the fault. Both o

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5

Aramphongphun, Chuckaphun. "In-mold coating of thermoplastic and composite parts microfluidics and rheology /." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141759615.

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6

Aubry, Jérôme. "Séismes au laboratoire : friction, plasticité et bilan énergétique." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEE053.

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Au sein de la lithosphère, la transition entre déformations fragile et plastique des roches s’effectue dans le régime semicassant. Comprendre le comportement des failles naturelles dans le régime semi-cassant est fondamental puisque d’importants séismes nucléent à la base de la zone sismogénique, à des conditions de pression et température proches de celles de la transition fragile-plastique. Pendant un séisme, l’énergie élastique accumulée lors de la période intersismique est dissipée au sein de l’interface de glissement par des processus frictionnels et de fracture, le reste étant relâché so

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7

Hosseinzadeh, Delandar Arash. "Numerical Modeling of Plasticity in FCC Crystalline Materials Using Discrete Dislocation Dynamics." Licentiate thesis, KTH, Materialteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175424.

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Plasticity in crystalline solids is controlled by the microscopic line defects known as “dislocations”. Decisive role of dislocations in crystal plasticity in addition to fundamentals of plastic deformation are presented in the current thesis work. Moreover, major features of numerical modeling method “Discrete Dislocation Dynamics (DDD)” technique are described to elucidate a powerful computational method used in simulation of crystal plasticity. First part of the work is focused on the investigation of strain rate effect on the dynamic deformation of crystalline solids. Single crystal copper

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8

Koran, François. "Anomalous wall slip behavior of linear low density polyethylenes." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26394.

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It is becoming generally accepted that wall slip, the loss of adhesion of a polymer to a solid substrate, occurs when the shear stress exceeds a critical value. Wall slip probably plays a much more important role in plastics processing than has been previously thought. For example, the extrudate distortion called sharkskin is thought to involve slip. Recent experiments have shown that this phenomenon is highly material dependant. The surface chemistry of both the molten polymer and the bounding surface interface play important roles in both the occurrence and magnitude of wall slip. The initia

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9

Hatzikiriakos, Savvas Georgios. "Wall slip of linear polyethylenes and its role in melt fracture." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70285.

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Experiments were performed in a sliding plate rheometer and in capillaries and slits with several polymer melts, particularly polyethylenes, to determine the conditions for the onset of slip and melt fracture. In the sliding plate rheometer various shear tests were used to determine the relationship between the slip velocity and wall shear stress, and based on the experimental observations both steady state and dynamic slip models are proposed that are consistent with experimental observations. In the capillary flow studies the dependence of the slip velocity on wall shear stress, pressure, te

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10

Sentmanat, Martin Lamar. "The effect of pressure on the wall slip of linear polyethylene." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39998.

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Experiments were performed on a slit die rheometer to determine the effect of pressure on the wall slip of linear polyethylene. A novel shear stress transducer was developed to measure local wall shear stress at several locations along the die. It was found that above the critical shear stress for the onset of slip, the shear stress distribution along the die was nonuniform. Furthermore, it was discovered that the local wall shear stress near the exit of the die was greater than the nominal, or length-averaged, shear stress within the die as calculated from the pressure drop. Teflon$ sp circle

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11

Chastagner, Matthew Wayne. "Slit die rheology of HDPE and ABS based wood plastic composites." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Summer2005/m%5Fchastagner%5F072705.pdf.

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12

Ait, Saadi Bachir. "Configuration des dislocations dans l'acier z3 cnd 17-12 apres fatigue : correlation au comportement mecanique." Poitiers, 1988. http://www.theses.fr/1988POIT2259.

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Etude du comportement en fatigue plastique de l'acier inoxydable austenitique 316l fatigue sous vide a 20, 300 et 600c dans une gamme de deformations plastiques imposees. Analyse par microscopie electronique en transmission des sous-structures a20 et 600c, les microstructures sont constituees de bandes de glissement persistantes, de murs-canaux des labyrinthes et des structures en echelle evoluant vers la structure cellulaire. A300c, une structure de contraste en cotes de velours est observee. Cette structure est fonction de la deformation plastique et provoque un durcissement cyclique seconda

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13

Manyo, Edem Yawo. "Modélisation avancée du contact pneu-chaussée pour l'étude des dégradations des chaussées en surface." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0034/document.

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L'apparition récente de nouveaux matériaux dans les structures de chaussée associée à une diminution de l'épaisseur des couches de surface et une augmentation du chargement des poids lourds et de leur fréquence de passage a entrainé de nouvelles pathologies de dégradation. Outre les problèmes d'orniérage bien connus, apparaissent désormais des fissures descendantes (top down cracking) ainsi que des problèmes de décohésion aux interfaces. Ces nouvelles pathologies entrainent des dépenses considérables sur l'ensemble du réseau (environ 15 milliards d'euros par an), particulièrement en zones urba

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14

Prouteau, Julien. "Amorçage de fissures de fatigue aux joints de macles dans un superalliage à base de nickel γ/γ'". Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2024. http://www.theses.fr/2024ESMA0009.

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Les superalliages durcis par la phase γ' sont utilisés dans les moteurs des avions civils nouvelle génération pour leur stabilité microstructurale à haute température qui permet l'augmentation du rendement. En service, les disques de turbine en superalliage sont principalement sollicités en fatigue à des températures intermédiaires, typiquement 450 °C. L'amorçage des fissures de fatigue dans cette classe d'alliage est contrôlé par de nombreux paramètres tels que le niveau de chargement, la température, l'environnement et la microstructure. De la température ambiante jusqu'aux températures inte

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15

Beaude, Nicolas. "Etude théorique et expérimentale du comportement élasto-plastique et de la localisation de la déformation dans les monocristaux." Paris 13, 1988. http://www.theses.fr/1988PA132005.

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Etude experimentale sur des monocristaux en superalliage à base de nickel soumis à des essais à chaud d'écrouissage cyclique à basse fréquence. Observation d'un phénomene d'instabilité plastique accompagné de la formation de lignes de glissement cristallographiques sur le fut de l'éprouvette. Modélisation du comportement élasto-plastique par une généralisation de la loi de schmid. L'extension de la loi de normalite permet de déterminer la direction de l'écoulement plastique et les systèmes actifs du glissement octaédrique. C'est la bifurcation locale de cette loi de comportement qui rend compt

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16

Tounsi, Bouchaïb. "Etude par microscopie en faisceau faible de la dissociation des dislocations dans Ni(3)Si : relation avec le comportement plastique." Poitiers, 1988. http://www.theses.fr/1988POIT2338.

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Analyse des microstructures de deformation dans l'alliage de structure l1::(2) en fonction de la temperature afin de comprendre les causes du comportement plastique anormal. A basse temperature, les superdislocations dominent. Analyse de leur structure fine et de leur role de verrou en glissement octaedrique. Etude de l'evolution des structures des dislocations lors de l'augmentation de la temperature d'essai

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17

Cheneau-Späth, Nadine. "Comportement de monocristaux et de polycristaux de métaux hexagonaux en grandes déformations plastiques : compression plane du titane et du magnésium." Grenoble INPG, 1996. http://www.theses.fr/1996INPG4201.

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La modélisation de l'évolution des textures de déformation des métaux hexagonaux, tels que le titane et le magnésium, et de l'anisotropie plastique des tôles manufacturées nécessitent la connaissance de leur comportement plastique lors des opérations classiques de mise en forme. Pour ce faire, nous caractérisons expérimentalement les mécanismes de déformation mis en jeu au cours de l'essai de compression plane sur plusieurs orientations de monocristaux de titane déformés à l'ambiante et de magnésium déformés à l'ambiante et à 400°C, en conditions de glissement et de maclage multiple, que nous

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18

Chieragatti, Rémy. "Influence de l'orientation cristallographique sur le comportement en fatigue oligocyclique du mar-m200 monocristallin." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0024.

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Etude experimentale sur le superalliage soumis a une charge cyclique uniaxiale suivant la direction de croissance 001 et les orientations 111, 011 et 123 a 650 c et 900c. Analyse des courbes d'ecrouissage cyclique. Caracterisation des systemes de glisement associes aux grandes deformations plastiques. Description par un modele de l'influence quantitative de l'orientation sur les courbes, d'ecrouissage cyclique. Mise en evidence du role preponderant de la periode de propagation des fissures sur l'endommagement. Prevision theorique de la duree de vie en fatigue en utilisant des donnees de fissur

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19

Fnaiech, Mustapha. "Contribution a l'etude "in situ" du glissement et de la montee des dislocations dans un compose semiconducteur (3/5) : insb." Toulouse 3, 1987. http://www.theses.fr/1987TOU30070.

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La these se compose de deux parties : etude du glissement des dislocations dans insb et etude de leur montee sous irradiation aux electrons. Le glissement est etudie par microscopie electronique. Mesure de la vitesse des dislocations et de la contrainte locale et comparaison avec les resultats obtenus par d'autres methodes. D'autre part, observation de l'apparition et de la croissance de defauts sous irradiation des electrons de 1 mev, dans un microscope a haute tension

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20

Douin, Joël. "Structure fine des dislocations et plasticité dans Ni(3)Ai." Poitiers, 1987. http://www.theses.fr/1987POIT2313.

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Etude detaillee de l'evolution de la structure fine des dislocations dans une large gamme de temperature autour du pic de limite elastique (600-700c). Analyse cristallographique de la structure ordonnee l1::(2) et des defauts plans de cette structure. Presentation, a partir de cette analyse, des resultats des simulations atomiques de paroi d'antiphase. Calcul de forme et d'energie de dislocations en elasticite anisotrope. Analyse du mecanisme de formation des defauts d'empilement. Etude, en fonction de la temperature d'essai, de la structure fine des dislocations. Influence d'une variation de

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21

Forget, Mathilde. "Laminage asymétrique de l'alliage de magnésium AZ31." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00930193.

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L'alliage de magnésium AZ31 présente une très faible densité. Cette caractéristique en fait un matériau apprécié pour la conception de structures légères. La limitation principale de son utilisation industrielle est sa mauvaise formabilité et ce en raison de la texture cristallographique des tôles qui s'avère être peu adaptée aux procédés de mise en forme tel que l'emboutissage. Cette texture résultant du laminage initial, l'ambition de ce travail est de la modifier en utilisant la technique de laminage asymétrique et de mesurer l'impact de cette voie sur la formabilité de l'alliage. Il a été

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22

Richards, Andrew Walter. "Interplay of Martensitic Phase Transformation and Plastic Slip in Polycrystals." Thesis, 2013. https://thesis.library.caltech.edu/7859/1/thesis.pdf.

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<p>Inspired by key experimental and analytical results regarding Shape Memory Alloys (SMAs), we propose a modelling framework to explore the interplay between martensitic phase transformations and plastic slip in polycrystalline materials, with an eye towards computational efficiency. The resulting framework uses a convexified potential for the internal energy density to capture the stored energy associated with transformation at the meso-scale, and introduces kinetic potentials to govern the evolution of transformation and plastic slip. The framework is novel in the way it treats plasticity

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23

Ashok, Raj J. "Study of Synergy between Plastic Deformation Mechanisms, Tribo-oxidation And Mechanically Mixed Layers in Tribology Of Ti-6Al-4V Slid Against SS316L And Alumina." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2714.

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Alloys of titanium are highly preferred materials for their excellent strength to weight ratio but the tribological issues while using them has been posing challenging issues for the tribological analyst, which are still areas of active research. Ti-6Al-4V (Ti64) is the most popular alloy of titanium and our understanding of the fundamental mechanisms of wear and friction of this alloy is still not complete. Previous investigations related to the tribology of these alloys have suggested a synergistic effect of plastic deformation and tribo-oxidation. The present investigation described in this

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24

Ashok, Raj J. "Study of Synergy between Plastic Deformation Mechanisms, Tribo-oxidation And Mechanically Mixed Layers in Tribology Of Ti-6Al-4V Slid Against SS316L And Alumina." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2714.

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Alloys of titanium are highly preferred materials for their excellent strength to weight ratio but the tribological issues while using them has been posing challenging issues for the tribological analyst, which are still areas of active research. Ti-6Al-4V (Ti64) is the most popular alloy of titanium and our understanding of the fundamental mechanisms of wear and friction of this alloy is still not complete. Previous investigations related to the tribology of these alloys have suggested a synergistic effect of plastic deformation and tribo-oxidation. The present investigation described in this

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25

Lin, Po-Chen, and 林珀丞. "Analysis of the rep gene and protein in a RCR plasmid pML from the halophilic methanogenic archaeon-Methanohalophilus mahii SLP." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/29468544082440516199.

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碩士<br>國立中興大學<br>生命科學系<br>92<br>Plasmid pML (2158 bp) from the moderately halophilic methanogenic archaeon- Methanohalophilus mahii SLP was sequenced. The deduced amino acid sequence of the largest ORF (328 aa) shows 34 % similarity to the putative replication protein (Rep) of pGRB1 from Halobacterium sp. and contains three sequence motifs that conserved in the Rep proteins of rolling circle replication (RCR) mechanism. Based on the numbers of tyrosine residues in motif 3, pML belongs to the superfamily I of RCR. The single-stranded intermediate form of pML was detected by southern blotting, wh

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26

(6620462), Eduard Andres Caicedo Casso. "SHEAR RHEOMETRY PROTOCOLS TO ADVANCE THE DEVELOPMENT OF MICROSTRUCTURED FLUIDS." Thesis, 2019.

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<p></p><p>This doctoral dissertation takes the reader through a journey where applied shear rheology and flow-velocimetry are used to understand the mesoscopic factors that control the flow behavior of three microstructured fluids. Three individual protocols that measure relative physical and mechanical properties of the flow are developed. Each protocol aims to advance the particular transformation of novel soft materials into a commercial product converging in the demonstration of the real the chemical, physical and thermodynamical factors that could potentially drive their successful transf

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