Bibliografías temáticas / Shear localizations

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Literatura académica sobre el tema "Shear localizations"

Autor: Grafiati
Publicado: 23 de noviembre de 2024

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Artículos de revistas sobre el tema "Shear localizations"

1

Chang, L. "On the Shear Bands and Shear Localizations in Elastohydrodynamic Lubrication Films". Journal of Tribology 127, n.º 1 (1 de enero de 2005): 245–47. http://dx.doi.org/10.1115/1.1843157.

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Lee, J. H. y Y. Zhang. "A Finite-Element Work-Hardening Plasticity Model of the Uniaxial Compression and Subsequent Failure of Porous Cylinders Including Effects of Void Nucleation and Growth—Part II: Localization and Fracture Criteria". Journal of Engineering Materials and Technology 118, n.º 2 (1 de abril de 1996): 169–78. http://dx.doi.org/10.1115/1.2804883.

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In Part I [1] of this paper, Gurson’s mixed hardening plasticity model with strain and stress-controlled nucleations, was used in a large deformation finite element program to study the plastic flow and damage in the uniaxial compression of cylinders under sticking friction. Due to low stress triaxiality at the bulge of the cylinders, it was found that localization may occur before void coalescence. In this paper, necessary conditions of localizations are analyzed for the axial compression of porous cylinders under sticking friction. Shear band type of localization with a normal mode of fracture has been predicted for the majority of the cases studied. Various existing localization conditions and fracture criteria are assessed using the results from the simulation. The maximum shear stress at failure is approximately constant and a constant critical damage can not be found.
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3

Voyiadjis, George Z., Amin H. Almasri, Danial Faghihi y Anthony N. Palazotto. "Analytical solution for shear bands in cold-rolled 1018 steel". Journal of the Mechanical Behaviour of Materials 20, n.º 4-6 (1 de junio de 2012): 89–102. http://dx.doi.org/10.1515/jmbm-2012-0001.

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AbstractCold-rolled 1018 (CR-1018) carbon steel has been well known for its susceptibility to adiabatic shear banding under dynamic loadings. Analysis of these localizations highly depends on the selection of the constitutive model. To deal with this issue, a constitutive model that takes temperature and strain rate effect into account is proposed. The model is motivated by two physical-based models: the Zerilli and Armstrong and the Voyiadjis and Abed models. This material model, however, incorporates a simple softening term that is capable of simulating the softening behavior of CR-1018 steel. Instability, localization, and evolution of adiabatic shear bands are discussed and presented graphically. In addition, the effect of hydrostatic pressure is illustrated.
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Kudryashov, N. A., R. V. Muratov y P. N. Ryabov. "The collective behavior of shear strain localizations in dipolar materials". Applied Mathematics and Computation 338 (diciembre de 2018): 164–74. http://dx.doi.org/10.1016/j.amc.2018.06.005.

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Deliveris, A. V., I. E. Zevgolis y N. C. Koukouzas. "NUMERICAL MODELLING OF SLOPE STABILITY IN OPEN PIT LIGNITE MINES: A COMPARATIVE STUDY". Bulletin of the Geological Society of Greece 50, n.º 2 (27 de julio de 2017): 671. http://dx.doi.org/10.12681/bgsg.11773.

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Slope stability of an open pit lignite mine was studied using numerical methods (FEM and FDM), by means of three different software packages whose performance was compared and similarities - differences were identified. Plane strain analyses were performed using the shear strength reduction technique under drained conditions and Mohr-Coulomb constitutive models. Based on the results, all three programs demonstrated qualitatively a good agreement in the determination of safety factors and the kinetics of the collapse mechanisms. Small differences were observed in terms of shear strains localizations. Important differences were evident in the development of plastic (shear) and tensile failure indicators. Nevertheless, the problem under examination may be addressed satisfactorily by all three programs.
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Rice, James R. "Heating, weakening and shear localization in earthquake rupture". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n.º 2103 (21 de agosto de 2017): 20160015. http://dx.doi.org/10.1098/rsta.2016.0015.

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Field and borehole observations of active earthquake fault zones show that shear is often localized to principal deforming zones of order 0.1–10 mm width. This paper addresses how frictional heating in rapid slip weakens faults dramatically, relative to their static frictional strength, and promotes such intense localization. Pronounced weakening occurs even on dry rock-on-rock surfaces, due to flash heating effects, at slip rates above approximately 0.1 m s −1 (earthquake slip rates are typically of the order of 1 m s −1 ). But weakening in rapid shear is also predicted theoretically in thick fault gouge in the presence of fluids (whether native ground fluids or volatiles such as H 2 O or CO 2 released by thermal decomposition reactions), and the predicted localizations are compatible with such narrow shear zones as have been observed. The underlying concepts show how fault zone materials with high static friction coefficients, approximately 0.6–0.8, can undergo strongly localized shear at effective dynamic friction coefficients of the order of 0.1, thus fitting observational constraints, e.g. of earthquakes producing negligible surface heat outflow and, for shallow events, only rarely creating extensive melt. The results to be summarized include those of collaborative research published with Nicolas Brantut (University College London), Eric Dunham (Stanford University), Nadia Lapusta (Caltech), Hiroyuki Noda (JAMSTEC, Japan), John D. Platt (Carnegie Institution for Science, now at *gramLabs), Alan Rempel (Oregon State University) and John W. Rudnicki (Northwestern University). This article is part of the themed issue ‘Faulting, friction and weakening: from slow to fast motion’.
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Prakash, Aditya, Tawqeer Nasir Tak, Namit N. Pai, S. V. S. Narayana Murty, P. J. Guruprasad, R. D. Doherty y Indradev Samajdar. "Slip band formation in low and high solute aluminum: a combined experimental and modeling study". Modelling and Simulation in Materials Science and Engineering 29, n.º 8 (11 de noviembre de 2021): 085016. http://dx.doi.org/10.1088/1361-651x/ac3369.

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Abstract Direct ex situ observations related slip band formation with deformed microstructures in commercial AA1050 and AA2219. The samples from both grades had similar grain sizes (∼250 μm) and nearly random crystallographic textures. However, AA2219 contained significantly more solute. Slip bands, on the internal long transverse (LT) plane in split channel die specimens, were characterized by primary spacings (λ) of 2–9 μm, heights (Z) of 160–360 nm and secondary shear strains ( γ LT S ). Higher deformation temperatures for both grades increased λ, decreased, Z and r e d u c e d γ LT S . At all deformation temperatures, AA1050 had smaller λ and higher Z, while AA2219 showed higher γ LT S . In-grain misorientations, but not residual strains, were larger in grains with finer λ in AA1050, but less so in AA2219. Discrete dislocation dynamics (DDD) simulations reported realistic slip bands with slip localizations. The simulations, initiated with static obstacles and sources, led to dislocation interactions and junction formation. The probability of junction stabilization (p) determined the ratio of dynamic sources to obstacles. Slip band formation appeared to be an outcome of the release of piled up dislocations leading to dislocation avalanches. Slip localization increased weakly with finer active slip plane spacing (λ *), giving higher dynamic obstacle strengths and densities, but strongly with smaller p. In particular, the DDD simulations captured experimental patterns of higher slip localizations and dislocation densities in low solute aluminum with finer λ *.
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Boulahia, R., Taoufik Boukharouba, Fahmi Zaïri, M. Naït-Abdelaziz, J. M. Gloaguen, R. Seguela y J. M. Lefebvre. "Successive Translucent and Opaque Shear Bands Accompanied by a Pronounced Periodic Waves Observed in a Polypropylene (PP) Processed by Single ECAE Pass". Advanced Materials Research 423 (diciembre de 2011): 12–25. http://dx.doi.org/10.4028/www.scientific.net/amr.423.12.

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The equal channel angular extrusion (ECAE) is an ingenious severe plastic deformation process used to modify texture and microstructure without reducing sample cross-section. The ECAE of polypropylene (PP) was conducted under various extrusion velocities and back-pressure levels using a 90° die. The application of single ECAE pass to PP was meticulously investigated at room temperature. The ECAE-induced deformation behaviour was examined in relation to the load versus ram displacement curves. Depending on extrusion conditions, PP displayed various types of plastic flow. For ram velocities beyond 4.5 mm/min, severe shear bands consisting of successive translucent and opaque bands were observed, accompanied on the top surface by more or less pronounced periodic waves. Although the application of a back-pressure significantly reduced the wave and shear-banding phenomena, slightly inhomogeneous shear deformation was still observed. Shear bands were only suppressed by decreasing extrusion velocity. The strain-induced crystalline microstructure was investigated by X-ray scattering. Shear-banded samples exhibited a strong texturing of the (hk0) planes along the shear direction in the translucent bands whereas perfect crystalline isotropy appeared in the opaque bands. Application of backpressure and/or reducing ram velocity resulted in uniform texturing along the extruded sample. Yet, texturing changed from single shear to twin-like shear orientation about the shear direction. Mechanical properties changes of the extruded specimens due to back-pressure and extrusion velocity effects were analyzed via uniaxial tensile tests. The tensile samples displayed multiple strain localizations in shear-banded materials whereas quite homogeneous deformation appeared for non-banded ones. These effects were connected with the crystalline texturing. The results also revealed significant increase in the strain hardening after ECAE. Full-field strain was measured under tensile loading using an optical strain measuring technique based upon Digital image correlation technique, suitable for large deformation, which confirms these effects.
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Katoh, Kazuo y Yasuko Noda. "Distribution of Cytoskeletal Components in Endothelial Cells in the Guinea Pig Renal Artery". International Journal of Cell Biology 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/439349.

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The cytoskeletal components of endothelial cells in the renal artery were examined by analysis of en face preparations under confocal laser scanning microscopy. Renal arterial endothelial cells were shown to be elongated along the direction of blood flow, while stress fibers ran perpendicular to the flow in the basal portion. Focal adhesions were observed along the stress fibers in dot-like configurations. On the other hand, stress fibers in the apical portion of cells ran along the direction of flow. The localizations of stress fibers and focal adhesions in endothelial cells in the renal artery differed from those of unperturbed aortic and venous endothelial cells. Tyrosine-phosphorylated proteins were mainly detected at the sites of cell-to-cell apposition, but not in focal adhesions. Pulsatile pressure and fluid shear stress applied over endothelial cells in the renal artery induce stress fiber organization and localization of focal adhesions. These observations suggest that the morphological alignment of endothelial cells along the direction of blood flow and the organization of cytoskeletal components are independently regulated.
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Abed, Farid H. y George Z. Voyiadjis. "Adiabatic Shear Band Localizations in BCC Metals at High Strain Rates and Various Initial Temperatures". International Journal for Multiscale Computational Engineering 5, n.º 3-4 (2007): 325–49. http://dx.doi.org/10.1615/intjmultcompeng.v5.i3-4.120.

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Tesis sobre el tema "Shear localizations"

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Kim, Kwon Hee. "Shear localization in viscoplastic solids". Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14662.

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Chantry, Matthew James. "Localization in transitional shear flows". Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664975.

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In turbulent flows at low Reynolds numbers localized structures are observed which can grow or spontaneously decay. Viewed as a dynamical system, a turbulent evolution forms a path through a phase space built upon exact invariant solutions of the Navier-Stokes equations. The leading stable and unstable manifolds of these solutions organise the local dynamics. In small periodic domains many of these solutions are known. However, to understand the full spatial-temporal nature of turbulence requires localized solutions which are unstable and live in a very high dimensional system. In the first half of this thesis we consider two problems in small, periodic domains where turbulence is global. We consider the geometry of the edge of chaos, a manifold which divides phase space and how such a manifold can be understood in the context of turbulent decay. We demonstrate that the edge is not separate from the turbulent dynamics but is wrapped up into these dynamics. Next we consider how the dynamics on the edge in short pipes are affected by Reynolds number and find new high Reynolds number solutions. In this second half we attack the problem of finding and understanding the origins of localized solutions. These solutions hold the key to expanding the theory towards physically realisable systems. Building upon the short pipe research we find the origin of the first localized pipe flow solution in a bifurcation from a downstream-periodic solution. Moving to a model for plane Couette flow, we attempt to find evidence of homoclinic-snaking as a route to spanwise localization. Instead we find a different route which matches recent work in duct flow. Finally, motivated by questions of how localized structures interact, we introduce a new flow, "localized Couette flow", and investigate the stability of this flow.
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Tsang, Ting-Yu 1959. "Shear localization in plane strain metal forming". Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/291333.

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A condition for the onset of shear localization for the two-dimensional plane strain case is presented. Based on the condition, shear localization in three different problems are studied. By using the NIKE2D finite element package, a punching process for thin sheet metal with frictional surfaces is analyzed and the relationship between the frictions and shear localization is discussed.
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Kobayashi, H. "Shear localization and fracture in torsion of metals". Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374880.

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Abu-Saman, Awni. "Large plastic deformation and shear localization of crystals". Doctoral thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/4954.

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Malvick, Erik Jon. "Void redistribution-induced shear localization and deformation in slopes /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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Heinicke, Christiane. "Lithospheric-Scale Stresses and Shear Localization Induced by Density-Driven Instabilities". Thesis, Uppsala universitet, Geofysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183725.

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The initiation of subduction requires the formation of lithospheric plates which mostly deform at their edges. Shear heating is a possible candidate for producing such localized deformation. In this thesis we employ a 2D model of the mantle with a visco-elasto-plastic rheology and enabled shear heating. We are able to create a shear heating instability both in a constant strain rate and a constant stress boundary condition setup. For the rst case, localized deformation in our specic setup is found for strain rates of 10-15 1/s and mantle temperatures of 1300°C. For constant stress boundaries, the conditions for a setup to localize are more restrictive. Mantle motion is induced by large cold and hot temperature perturbations. Lithospheric stresses scale with the size of these perturbations; maximum stresses are on the order of the yield stress (1 GPa). Adding topography or large inhomogeneities does not result in lithospheric-scale fracture in our model. However, localized deformation does occur for a restricted parameter choice presented in this thesis. The perturbation size has little effect on the occurrence of localization, but large perturbations shorten its onset time.
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Wang, Xingran. "Numerical simulation of the onset and propagation of shear band localization". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0028/NQ34855.pdf.

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Bourguignon, Matthieu. "Borosilicate glasses : from viscoplasticity to indentation cracking ?" Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS247.

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Comprendre les mécanismes de rupture des verres est d'une importance cruciale en raison des vastes applications industrielles de ces matériaux, où la maîtrise de leurs propriétés mécaniques détermine leur performance et leur durabilité. L'examen approfondi des mécanismes de plasticité sous indentation dans les verres aluminoborosilicatés a mis en évidence le rôle déterminant de la composition chimique sur le comportement mécanique et à la rupture. Il est apparu que la présence et la concentration relative de modificateurs de réseau tels que les oxydes alcalino-terreux, ou bien une plus grande concentration de bore en tant que formateur de réseau, influencent significativement l'écoulement plastique localisé sous forme de bandes de cisaillement ainsi que la résistance à l'initiation et à la propagation des fissures, suggérant que des ajustements précis de la composition peuvent améliorer la résistance de ces matériaux face aux sollicitations mécaniques. D'autre part, un ensemble de caractérisations mécaniques et thermiques de ces verres a permis d'établir des premières corrélations entre leur structure et leur comportement mécanique sous indentation. Par ailleurs, l'étude de l'effet de l'irradiation électronique sur la plasticité des verres silicatés a révélé que l'exposition aux électrons peut accroître la sensibilité de ces matériaux à la déformation plastique, modifiant leur structure microscopique et leurs propriétés mécaniques. Il s'est avéré que l'irradiation électronique catalyse les réarrangements structuraux, sous contrainte, liés à la plasticité, entraînant une nette diminution de la limite d'élasticité du verre silicaté. Ces modifications ont été analysées à travers des modèles avancés de relaxation et de déformation, permettant de quantifier et de prévoir l'impact de l'irradiation sur le comportement des verres. Ces travaux contribuent à la compréhension des processus de plasticité dans les verres et ouvrent la voie à des stratégies d'optimisation de leurs propriétés mécaniques, notamment en concevant des compositions spécifiques pour renforcer leur résistance dans des environnements industriels exigeants ou soumis à des conditions sévères
Understanding the mechanisms of glass fracture is crucial due to the extensive industrial applications of these materials, where the control of their mechanical properties is key to ensuring performance and durability. In-depth examination of plasticity mechanisms under indentation in aluminoborosilicate glasses has highlighted the critical role of chemical composition in mechanical behavior and crack resistance. It has been observed that the presence and relative concentration of network modifiers, such as alkaline earth oxides, or a higher concentration of boron as a network former, significantly influence localized plastic flow in the form of shear bands, as well as the resistance to crack initiation and propagation. This suggests that precise adjustments in composition can enhance the material's resilience under mechanical stress. Additionally, a series of mechanical and thermal characterizations of these glasses have established correlations between their structure and mechanical behavior under indentation. Furthermore, the study of the effects of electron irradiation on the plasticity of silicate glasses revealed that exposure to electrons can increase these materials' susceptibility to plastic deformation, altering their microscopic structure and mechanical properties. It was found that electron irradiation catalyzes structural rearrangements under stress, leading to a marked decrease in the yield stress of silicate glasses. These changes were analyzed through advanced relaxation and deformation models, allowing for the quantification and prediction of irradiation's impact on glass behavior. This work advances the understanding of plasticity processes in glasses and paves the way for strategies to optimize their mechanical properties, particularly by designing specific compositions to enhance their resistance in demanding industrial environments or under severe conditions
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Stevens, John Boyet. "Finite Element Analysis of Adiabatic Shear Bands in Impact and Penetration Problems". Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/36650.

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We study axisymmetric deformations of depleted uranium (DU) and tungsten heavy alloy (WHA) rods impacting at normal incidence both a rigid, planar target and a thick, deformable steel target. Each deformable material is modeled as elastic thermoviscoplastic; the flow stress increases with an increase in the effective plastic strain and effective plastic strain-rate but decreases with a rise in the temperature. An objective of this work is to ascertain when and where a shear band, defined as a narrow region of rapid, intense plastic deformation, forms in each material subject to impact loading. The Taylor impact simulations show that shear bands form earlier in WHA than in DU for the material parameters used. In the penetration simulations, shear bands form continuously in the ejecta of the DU penetrator while only one shear band occurs in the WHA ejecta followed by more uniform deformations. Note: In order to view the computer animations referenced in this thesis, one must have a QuickTime movie player and download the files named Ujce.mov Uz2e.mov Uz3e.mov Wjce.mov Wz2e.mov and Wz3e.mov from the same directory the "pdf" file resides in.
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Libros sobre el tema "Shear localizations"

1

Bai, Yilong. Adiabatic shear localization: Occurrence, theories, and applications. Oxford: Pergamon Press, 1992.

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Tejchman, Jacek. Finite element modeling of shear localization in granular bodies in hypoplasticity with enhancements. Gdańsk: Gdańsk University of Technology Publishers, 2005.

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Miguel Torre do Vale Arriaga e Cunha. Stability Analysis of Metals Capturing Brittle and Ductile Fracture through a Phase Field Method and Shear Band Localization. [New York, N.Y.?]: [publisher not identified], 2016.

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4

Jara, P. Localization and sheaves: A relative point of view. Burnt Mill, Harlow, Essex, England: Longman, 1995.

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Jara, P. Localization and sheaves: A relative point of view. New York: Longman, 1996.

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Bueso, J. L. Compatibility, stability, and sheaves. New York: M. Dekker, 1995.

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Homburg, Janelle. Field and theoretical investigations of strain localization: Effects of mineralogy, shear heating and grain size evolution on deformation in the Earth. [New York, N.Y.?]: [publisher not identified], 2013.

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Adiabatic Shear Localization. Elsevier, 2012. http://dx.doi.org/10.1016/c2011-0-06979-x.

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Dodd, Bradley y Yilong Bai. Introduction to Adiabatic Shear Localization. Imperial College Press, 2014.

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Introduction to Adiabatic Shear Localization. World Scientific Publishing Co Pte Ltd, 2014.

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Capítulos de libros sobre el tema "Shear localizations"

1

Wu, Wei y Dimitrios Kolymbas. "On Oscillatory Shear Stress in Simple Shear". En Anisotropy and Localization of Plastic Deformation, 365–68. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_85.

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Boutonnet, Emmanuelle y Phillipe-Hervé Leloup. "Quartz-strain-rate-metry (QSR), an efficient tool to quantify strain localization in the continental crust". En Ductile Shear Zones, 63–92. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118844953.ch6.

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Miyauchi, Kunio. "Rotation Problems in Simple Shear Deformation". En Anisotropy and Localization of Plastic Deformation, 335–38. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_78.

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Zhang, X. T. y R. C. Batra. "Shear Band Development in a Viscoplastic Cylinder". En Anisotropy and Localization of Plastic Deformation, 103–6. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_24.

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Nesterenko, Vitali F. "Shear Localization and Shear Bands Patterning in Heterogeneous Materials". En Dynamics of Heterogeneous Materials, 307–84. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4757-3524-6_4.

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Bardet, J. P. y J. Proubet. "A Shear Band Analysis in Elastoplastic Granular Material". En Anisotropy and Localization of Plastic Deformation, 35–38. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_8.

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Tzavaras, Athanasios E. "Shear Strain Localization in Plastic Deformations". En Shock Induced Transitions and Phase Structures in General Media, 231–50. New York, NY: Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4613-8348-2_12.

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Duszek-Perzyna, Maria K. y Piotr Perzyna. "Adiabatic Shear Band Localization in Elastic-Plastic Single Crystals". En Anisotropy and Localization of Plastic Deformation, 51–55. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_12.

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Wright, T. W. "Susceptibility to Shear Band Formation in Work Hardening Materials". En Anisotropy and Localization of Plastic Deformation, 95–98. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_22.

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Wang, Xinwei, Akhtar S. Khan y Huigeng Yan. "On Subsequent Yield Surfaces after Finite Shear Pre-Straining". En Anisotropy and Localization of Plastic Deformation, 361–64. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_84.

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Actas de conferencias sobre el tema "Shear localizations"

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Chang, L. "On the Shear Bands and Shear Localizations in EHL Films". En ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64289.

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Liquid lubricants in elastohydrodynamic lubrication (EHL) are subjected to high pressures of the magnitude of 109 N/m2 (GPa). Under these high pressures, the lubricants in room temperatures are usually in the glassy state behaving as amorphous solids. Similar to the polymers, the lubricants exhibit elastic or visco-elastic behavior under low-shear-stress loading and plastic or visco-plastic behavior with high shear stresses. Recent laboratory experiments have revealed two types of localized shear responses that can take place in the lubricant bulk. The localized shear may be active in the EHL film and may play a significant role in the responses exhibited by the contact conjunction. A typical example is the EHL traction. This paper summarizes the up-to-date research related to the shear localizations.
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Chang, L. "A Parametric Analysis of the Thermal Shear Localization in EHL Films". En World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63955.

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Experiments and computer simulations [1] have revealed some unusual results of elastohydrodynamic lubrication (EHL) associated with a high degree of thermally induced inhomogeneous shear across the lubricant film, or thermal shear localization. The results include the development of a sizable film dimple in the central EHL region [2] and a dramatic reduction in EHL traction [3, 4]. In this study, a theoretical analysis is carried out to determine the conditions under which the thermal shear localization may develop in EHL films. For a Newtonian lubricant obeying the Barus law of viscosity, a dimensionless group-parameter is identified that fully governs the degree of the thermal inhomogeneous shear. Results are presented that show the critical range of values of this parameter corresponding to the onset of the shear localization. The analysis is also extended to lubricants with non-Newtonian behavior. Results suggest that the same dimensionless group-parameter may be used to measure the degree of the shear localization when the lubricant viscosity in the parameter is replaced by an effective viscosity that accounts for the non-Newtonian effect. Reference [5] presents details of the theoretical formulation and results analysis.
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3

Chen, H. C., M. A. Meyers y V. F. Nesterenko. "Shear localization in granular and comminuted alumina". En Proceedings of the conference of the American Physical Society topical group on shock compression of condensed matter. AIP, 1996. http://dx.doi.org/10.1063/1.50632.

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4

Margraf, Jonathan y Nathan Barton. "Shear band insertion for capturing strain localization". En SHOCK COMPRESSION OF CONDENSED MATTER - 2019: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP Publishing, 2020. http://dx.doi.org/10.1063/12.0000889.

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5

Anghel, Veronica, Carl P. Trujillo, Ramon M. Martinez y Jillian P. Bennett. "Microstructure dependent shear localization in 316L SS". En SHOCK COMPRESSION OF CONDENSED MATTER - 2022: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP Publishing, 2023. http://dx.doi.org/10.1063/12.0020443.

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Campbell, Triona, Reena Cole y Michael O’Donnell. "Pressure Induced Strain at Femoral Artery Bypass Graft Junctions". En ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176342.

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Femoral or femoropopliteal artery bypass graft junctions have a predilection for failure due to restenosis. It has been clinically proven that vascular reconstructions tend to restenose within a short period of time [1]. Extensive studies have cited wall shear stresses as being primarily responsible and definite correlations between hydrodynamic stresses in the arterial wall and arterial disease have been shown [2,3]. However intensive investigations into wall shear stresses have lead to conflicting arguments on the proliferation and propagation of stenoses. It was concluded by Freidman [4] that the intima at sites exposed to relatively high or unidirectional shears thickened initially, but as time progressed the greatest thicknesses were ultimately achieved at sites exposed to lower or more oscillatory shear environments. A contradicting view was expressed by Nazemi [5] that low wall shear stress contributed to the onset of atherosclerotic plaque formation, whilst high wall shear stress encouraging plaque growth. A number of studies have however established a statistically significant correlation between pressure and intimal hyperplasia and concluded that blood pressure and not blood flow is the primary factor responsible for the localization of atherosclerosis [6–8].
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Guilbault, R. "Influence of thermal shear localization on elastohydrodynamic contacts". En TRIBOLOGY AND DESIGN 2012. Southampton, UK: WIT Press, 2012. http://dx.doi.org/10.2495/td120011.

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Gu, YaBei. "Shear Localization and Patterning of Shear Bands in PTFE and Its Mixtures with Metals". En SHOCK COMPRESSION OF CONDENSED MATTER - 2003: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2004. http://dx.doi.org/10.1063/1.1780352.

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Duan, Xinjian, Don Metzger y Mukesh Jian. "Influence of Yield Criteria on the Prediction of Shear Localization Considering the Inhomogeneous Distribution of Microstructure". En ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2747.

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The occurrence of shear localization in structural materials is often associated with bifurcation in continuum solid mechanics. Many approaches such as J2 corner theory and the void model have been proposed to simulate this phenomenon by the use of FEM. In this paper, a new approach with a basis in microstructural inhomogeneity has been proposed and successfully applied to simulate large strain deformation in uniaxial tension of aluminium alloys. The method, in addition, takes advantage of a more suitable hardening law for Al alloys — namely the Voce equation. Further, the influence of various yield criteria (i.e. von Mises, Hill’s 1948 and Barlat’s 1991) on the prediction of shear localization is discussed in the present work. The predicted shear band angle is also compared with the measured value.
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Iyer, K., S. Schoenfeld, D. Casem y T. Wright. "Validation of a perturbed-continuum model for shear localization". En Proceedings. Users Group Conference. IEEE, 2004. http://dx.doi.org/10.1109/dod_ugc.2004.54.

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Informes sobre el tema "Shear localizations"

1

Lesuer, D., M. LeBlanc, B. Riddle y B. Jorgensen. Modeling of shear localization in materials. Office of Scientific and Technical Information (OSTI), febrero de 1998. http://dx.doi.org/10.2172/585518.

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Becker, R., J. Belak y G. Campbell. Shear Localization and Fracture in Shocked Metals. Office of Scientific and Technical Information (OSTI), diciembre de 2002. http://dx.doi.org/10.2172/15004900.

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LeBrun, Thomas John. Analysis of Compact-Forced Simple Shear and Compact-Forced Double Shear Test Specimens for Shear Localization in Materials. Office of Scientific and Technical Information (OSTI), mayo de 2017. http://dx.doi.org/10.2172/1356162.

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Garaizar, F., D. Trebotich, J. McNaney, M. Kumar, J. Stolken y G. Campbell. Shear Localization and Failure in Shocked Metals Final Report. Office of Scientific and Technical Information (OSTI), febrero de 2004. http://dx.doi.org/10.2172/15013902.

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Li, Mo. Search for the microscopic origin of defects and shear localization in metallic glasses. Office of Scientific and Technical Information (OSTI), noviembre de 2001. http://dx.doi.org/10.2172/821158.

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Margraf, J. D. Capturing Rate-Dependent Shear Localization Using a Traction Balance Mixed Zone Closure Model and a Shear Band Insertion Mechanism in ALE3D. Office of Scientific and Technical Information (OSTI), septiembre de 2018. http://dx.doi.org/10.2172/1608525.

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Rudnicki, J. W. Shear strain localization and fracture evolution in rock. Progress report, April 15, 1993--February 15, 1994. Office of Scientific and Technical Information (OSTI), marzo de 1994. http://dx.doi.org/10.2172/10134863.

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Rahmani, Mehran, Xintong Ji y Sovann Reach Kiet. Damage Detection and Damage Localization in Bridges with Low-Density Instrumentations Using the Wave-Method: Application to a Shake-Table Tested Bridge. Mineta Transportation Institute, septiembre de 2022. http://dx.doi.org/10.31979/mti.2022.2033.

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This study presents a major development to the wave method, a methodology used for structural identification and monitoring. The research team tested the method for use in structural damage detection and damage localization in bridges, the latter being a challenging task. The main goal was to assess capability of the improved method by applying it to a shake-table-tested prototype bridge with sparse instrumentation. The bridge was a 4-span reinforced concrete structure comprising two columns at each bent (6 columns total) and a flat slab. It was tested to failure using seven biaxial excitations at its base. Availability of a robust and verified method, which can work with sparse recording stations, can be valuable for detecting damage in bridges soon after an earthquake. The proposed method in this study includes estimating the shear (cS) and the longitudinal (cL) wave velocities by fitting an equivalent uniform Timoshenko beam model in impulse response functions of the recorded acceleration response. The identification algorithm is enhanced by adding the model’s damping ratio to the unknown parameters, as well as performing the identification for a range of initial values to avoid early convergence to a local minimum. Finally, the research team detect damage in the bridge columns by monitoring trends in the identified shear wave velocities from one damaging event to another. A comprehensive comparison between the reductions in shear wave velocities and the actual observed damages in the bridge columns is presented. The results revealed that the reduction of cS is generally consistent with the observed distribution and severity of damage during each biaxial motion. At bents 1 and 3, cS is consistently reduced with the progression of damage. The trends correctly detected the onset of damage at bent 1 during biaxial 3, and damage in bent 3 during biaxial 4. The most significant reduction was caused by the last two biaxial motions in bents 1 and 3, also consistent with the surveyed damage. In bent 2 (middle bent), the reduction trend in cS was relatively minor, correctly showing minor damage at this bent. Based on these findings, the team concluded that the enhanced wave method presented in this study was capable of detecting damage in the bridge and identifying the location of the most severe damage. The proposed methodology is a fast and inexpensive tool for real-time or near real-time damage detection and localization in similar bridges, especially those with sparsely deployed accelerometers.
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Oliynyk, Kateryna y Matteo Ciantia. Application of a finite deformation multiplicative plasticity model with non-local hardening to the simulation of CPTu tests in a structured soil. University of Dundee, diciembre de 2021. http://dx.doi.org/10.20933/100001230.

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In this paper an isotropic hardening elastoplastic constitutive model for structured soils is applied to the simulation of a standard CPTu test in a saturated soft structured clay. To allow for the extreme deformations experienced by the soil during the penetration process, the model is formulated in a fully geometric non-linear setting, based on: i) the multiplicative decomposition of the deformation gradient into an elastic and a plastic part; and, ii) on the existence of a free energy function to define the elastic behaviour of the soil. The model is equipped with two bonding-related internal variables which provide a macroscopic description of the effects of clay structure. Suitable hardening laws are employed to describe the structure degradation associated to plastic deformations. The strain-softening associated to bond degradation usually leads to strain localization and consequent formation of shear bands, whose thickness is dependent on the characteristics of the microstructure (e.g, the average grain size). Standard local constitutive models are incapable of correctly capturing this phenomenon due to the lack of an internal length scale. To overcome this limitation, the model is framed using a non-local approach by adopting volume averaged values for the internal state variables. The size of the neighbourhood over which the averaging is performed (characteristic length) is a material constant related to the microstructure which controls the shear band thickness. This extension of the model has proven effective in regularizing the pathological mesh dependence of classical finite element solutions in the post-localization regime. The results of numerical simulations, conducted for different soil permeabilities and bond strengths, show that the model captures the development of plastic deformations induced by the advancement of the cone tip; the destructuration of the clay associated with such plastic deformations; the space and time evolution of pore water pressure as the cone tip advances. The possibility of modelling the CPTu tests in a rational and computationally efficient way opens a promising new perspective for their interpretation in geotechnical site investigations.
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Kamrath, Matthew, Vladimir Ostashev, D. Wilson, Michael White, Carl Hart y Anthony Finn. Vertical and slanted sound propagation in the near-ground atmosphere : amplitude and phase fluctuations. Engineer Research and Development Center (U.S.), mayo de 2021. http://dx.doi.org/10.21079/11681/40680.

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Sound propagation along vertical and slanted paths through the near-ground atmosphere impacts detection and localization of low-altitude sound sources, such as small unmanned aerial vehicles, from ground-based microphone arrays. This article experimentally investigates the amplitude and phase fluctuations of acoustic signals propagating along such paths. The experiment involved nine microphones on three horizontal booms mounted at different heights to a 135-m meteorological tower at the National Wind Technology Center (Boulder, CO). A ground-based loudspeaker was placed at the base of the tower for vertical propagation or 56m from the base of the tower for slanted propagation. Phasor scatterplots qualitatively characterize the amplitude and phase fluctuations of the received signals during different meteorological regimes. The measurements are also compared to a theory describing the log-amplitude and phase variances based on the spectrum of shear and buoyancy driven turbulence near the ground. Generally, the theory correctly predicts the measured log-amplitude variances, which are affected primarily by small-scale, isotropic turbulent eddies. However, the theory overpredicts the measured phase variances, which are affected primarily by large-scale, anisotropic, buoyantly driven eddies. Ground blocking of these large eddies likely explains the overprediction.
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