Dissertationen zum Thema „Plastic slip“
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Lloyd, Jeffrey Townsend. „Implications of limited slip in crystal plasticity“. Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34808.
Der volle Inhalt der QuelleBayerschen, 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.
Der volle Inhalt der QuelleChaloupka, Ondrej. „Modelling evolution of anisotropy in metals using crystal plasticity“. Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8435.
Der volle Inhalt der QuelleCrooks, 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.
Der volle Inhalt der QuelleAramphongphun, 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.
Der volle Inhalt der QuelleAubry, Jérôme. „Séismes au laboratoire : friction, plasticité et bilan énergétique“. Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEE053.
Der volle Inhalt der QuelleIn the lithosphere, the transition from brittle to plastic rock deformation corresponds to the semi-brittle regime. Understand how natural faults behave in the semi-brittle regime is fundamental to explain why large earthquakes generally nucleate at the base of the seismogenic zone, found at pressure and temperature conditions close to the predicted brittle-plastic transition. During an earthquake, part of the released elastic strain energy stored during the interseismic period is dissipated within a fault slip zone by frictional and fracturing processes, the rest being radiated away via elastic waves. This energy balance is influenced by the deformation of fault surfaces during slow or fast sliding, especially by frictional heating processes which could not be resolved by seismology. To investigate semi-brittle deformation and the energy balance of natural earthquakes, we performed laboratory earthquakes in triaxial conditions on experimental faults of various lithologies. We studied the influence of the confining pressure, axial loading rates, temperature and fault roughness on fault stability across the brittle-plastic transition and investigate the dynamics of laboratory earthquakes by measuring frictional heat dissipated during the propagation of shear instabilities. The main conclusions are twofold. First, laboratory earthquakes may nucleate on inherited fault interfaces at brittle-plastic transition conditions and fault slip behavior is mainly influenced by roughness. Second, we conclude that during sliding, faults exhibit a transition from a weak stage with multiple strong asperities and little overall radiation, to a highly radiative stage during which the fault behaves as a single strong asperity
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.
Der volle Inhalt der QuelleQC 20151015
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.
Der volle Inhalt der QuelleHatzikiriakos, 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.
Der volle Inhalt der QuelleSentmanat, 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.
Der volle Inhalt der QuelleA new semi-empirical model for the pressure dependence of slip was developed based on the effect of pressure on the work of adhesion and the work needed for flow. The new model indicates that pressure can both suppress and promote slip depending on the level of stress involved. At low pressures, and for a given shear stress, slip is markedly suppressed due to the increase in the work of adhesion. As pressure increases, however, the work needed for flow overcomes the work of adhesion, and slip dramatically increases. However, at higher pressure, the effect of pressure on slip becomes weaker. Numerical simulation results with the new model predict the existence of a local maximum in the shear stress distribution along the die for flow with slip.
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.
Der volle Inhalt der QuelleAit, 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.
Der volle Inhalt der QuelleManyo, 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.
Der volle Inhalt der QuelleThe recent appearance of new materials in road structures associated with surface layers thickness decreasing and the increasing of trucks loading and their passage frequency has led to new pathologies of degradation. In addition to the well-known rutting problems, top down cracking is now appearing as well as problems of decohesion at the interfaces. These new pathologies led to considerable expenditure on the entire network (around 15 billion euros per year), particularly in urbanized areas that are more prone to surface damage and do not make it possible to adequately estimate the lifetimes of the roadway, most often overestimated in current design methods. This doctoral work proposes a new approach of the tire-road contact allowing for better apprehend of the main and residual stresses in a bituminous pavement structure. Using a fast numerical tool based on a semi-analytical approach ("Semi-Analytical Methods" (SAM)), the precise geometry of the tire is integrated in order to obtain a real contact pressure distribution as well as surface shear on the pavement surface. Initially, an elastic tractive rolling contact model is implemented for simple theoretical cases and validated by analytical and numerical results from the literature.Then, this model is extended to take into account the elastoplastic behavior of the bodies in contact. This is compared to a numerical result based on the nite element method from the literature. The application for tire-pavement contact results, show a non-uniform distribution of stresses in the structure and mainly in the rst centimeters below the surface with much higher levels than can be predicted by current models that use a uniformly distributed load. The contact pressure is compared to the measurements made by a system called TekScan and the mechanical elds in sublayers are compared to those of Alizé-LCPC in the case of a simple structure. The surface shears are determined in the case of tractive rolling. An application is carried out on the modeling of surface pavement damage. Firstly, analyzes of the behavior of the surface pavement are carried out for a semi-innite semi-grit asphalt concrete layer supposed to be elastic, homogeneous under conditions of acceleration, braking and turning. For studies on top down cracking, principals deformations and directions are determined and analyzed. Then, the elastoplastic contact model is applied on a semi-innite asphalt agragate layer. Deformations and residuals stresses generated in the structure are determined for an analysis on the instability ruts. Once validated, these results will make it possible to more accurately estimate the residual life of pavements but also to understand and avoid surface or near surfacedegradation mechanisms
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.
Der volle Inhalt der QuelleTounsi, 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.
Der volle Inhalt der QuelleCheneau-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.
Der volle Inhalt der QuelleChieragatti, Rémy. „Influence de l'orientation cristallographique sur le comportement en fatigue oligocyclique du mar-m200 monocristallin“. Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0024.
Der volle Inhalt der QuelleFnaiech, 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.
Der volle Inhalt der QuelleDouin, Joël. „Structure fine des dislocations et plasticité dans Ni(3)Ai“. Poitiers, 1987. http://www.theses.fr/1987POIT2313.
Der volle Inhalt der QuelleForget, Mathilde. „Laminage asymétrique de l'alliage de magnésium AZ31“. Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00930193.
Der volle Inhalt der QuelleRichards, Andrew Walter. „Interplay of Martensitic Phase Transformation and Plastic Slip in Polycrystals“. Thesis, 2013. https://thesis.library.caltech.edu/7859/1/thesis.pdf.
Der volle Inhalt der QuelleInspired 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 on par with transformation.
We implement the framework in the setting of anti-plane shear, using a staggered implicit/explict update: we first use a Fast-Fourier Transform (FFT) solver based on an Augmented Lagrangian formulation to implicitly solve for the full-field displacements of a simulated polycrystal, then explicitly update the volume fraction of martensite and plastic slip using their respective stick-slip type kinetic laws. We observe that, even in this simple setting with an idealized material comprising four martensitic variants and four slip systems, the model recovers a rich variety of SMA type behaviors. We use this model to gain insight into the isothermal behavior of stress-stabilized martensite, looking at the effects of the relative plastic yield strength, the memory of deformation history under non-proportional loading, and several others.
We extend the framework to the generalized 3-D setting, for which the convexified potential is a lower bound on the actual internal energy, and show that the fully implicit discrete time formulation of the framework is governed by a variational principle for mechanical equilibrium. We further propose an extension of the method to finite deformations via an exponential mapping. We implement the generalized framework using an existing Optimal Transport Mesh-free (OTM) solver. We then model the $\alpha$--$\gamma$ and $\alpha$--$\varepsilon$ transformations in pure iron, with an initial attempt in the latter to account for twinning in the parent phase. We demonstrate the scalability of the framework to large scale computing by simulating Taylor impact experiments, observing nearly linear (ideal) speed-up through 256 MPI tasks. Finally, we present preliminary results of a simulated Split-Hopkinson Pressure Bar (SHPB) experiment using the $\alpha$--$\varepsilon$ model.
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.
Der volle Inhalt der QuelleAshok, 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.
Der volle Inhalt der QuelleLin, Po-Chen, und 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.
Der volle Inhalt der Quelle國立中興大學
生命科學系
92
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, which confirms that pML replicate through RCR mechanism. RT-PCR with total M. mahii RNA and primers specific for orf1 amplified an RNA species of 984 bp. DNA encoding ORF1 was cloned into Escherichia coli and a polypeptide with expected molecular mass of 38 kDa was expressed. Both the N-terminal amino acid sequence and western blotting with anti-His (C-term)-HRP antibody confirm that this overexpressed protein is the translational product of orf1. This protein binds to pMM3 which contains a putative double-stranded replication region and made this fragment sensitive to S1 nuclease indicating the site-specific nuclease activity of this Rep protein. Phylogenetic analysis based on the amino acid sequences of all known archaeal Rep indicated that Rep of pML is clustered to the plasmids of the aerobic extremely halophilic Euryarchaeota, which they inhabited together at hypersaline environment.
(6620462), Eduard Andres Caicedo Casso. „SHEAR RHEOMETRY PROTOCOLS TO ADVANCE THE DEVELOPMENT OF MICROSTRUCTURED FLUIDS“. Thesis, 2019.
Den vollen Inhalt der Quelle findenThis 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 transformation.
First, this dissertation introduces the use of rotational and oscillatory shear rheometry to quantify the solvent evaporation effect on the flow behavior of polymer solutions used to fabricate isoporous asymmetric membranes. Three different A-B-C triblock copolymer were evaluated: polyisoprene-b-polystyrene-b-poly(4-vinylpyridine) (ISV); polyisoprene-b-polystyrene-b-poly(N,N-dimethylacrylamide) (ISD); and polyisoprene-b-polystyrene-b-poly(tert-butyl methacrylate) (ISB). The resulting evaporation-induced microstructure showed a solution viscosity and film viscoelasticity strongly dependent on the chemical structure of the triblock copolymer molecules.
Furthermore, basic shear rheometry, flow birefringence, and advanced flow-velocimetry are used to deconvolute the flow-microstructure relationships of concentrated surfactant solutions. Sodium laureth sulfate in water (SLE1S) was used to replicate spherical, worm-like, and hexagonally packed micelles and lamellar structures. Interesting findings demonstrated that regular features of flow curves, such as power-law shear thinning behavior, resulted from a wide variety of experimental artifacts that appeared when measuring microstructured fluids with shear rheometry.
Finally, the successful integration of shear rheometry to calculate essential parameters to be used in a cost-effective visualization technique (still in development) used to calculate the dissolution time of polymers is addressed. The use of oscillatory rheometry successfully quantify the viscoelastic response of polyvinyl alcohol (PVA) solutions and identify formulations changes such as additive addition. The flow behavior of PVA solutions was correlated to dissolution behavior proving that the developed protocol has a high potential as a first screening tool.