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Letteratura scientifica selezionata sul tema "Multiscale deformations"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Multiscale deformations"

Shahi, Shahrokh, e Soheil Mohammadi. "A Multiscale Finite Element Simulation of Human Aortic Heart Valve". Applied Mechanics and Materials 367 (agosto 2013): 275–79. http://dx.doi.org/10.4028/www.scientific.net/amm.367.275.

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Some of the heart valve diseases can be treated by surgical replacement with either a mechanical or bioprosthetic heart valve (BHV). Recently, tissue-engineered heart valves (TEHVs) have been proposed to be the ultimate solution for treating valvular heart disease. In order to improve the durability and design of artificial heart valves, recent studies have focused on quantifying the biomechanical interaction between the organ, tissue, and cellular –level components in native heart valves. Such data is considered fundamental to designing improved BHVs. Mechanical communication from the larger scales affects active biomechanical processes. For instance any organ-scale motion deforms the tissue, which in turn deforms the interstitial cells (ICs). Therefore, a multiscale solution is required to study the behavior of human aortic valve and to predict local cell deformations. The proposed multiscale finite element approach takes into account large deformations and nonlinear anisotropic hyperelastic material models. In this simulation, the organ scale motion is computed, from which the tissue scale deformation will be extracted. Similarly, the tissue deformation will be transformed into the cell scale. Finally, each simulation is verified against a number of experimental measures.

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LI, ZHIPING. "MULTISCALE MODELLING AND COMPUTATION OF MICROSTRUCTURES IN MULTI-WELL PROBLEMS". Mathematical Models and Methods in Applied Sciences 14, n. 09 (settembre 2004): 1343–60. http://dx.doi.org/10.1142/s0218202504003647.

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A multiscale model and numerical method for computing microstructures with large and inhomogeneous deformation is established, in which the microscopic and macroscopic information is recovered by coupling the finite order rank-one convex envelope and the finite element method. The method is capable of computing microstructures which are locally finite order laminates. Numerical experiments on a double-well problem show that plenty of stress free large deformations can be achieved by microstructures consisting of piecewise simple twin laminates.

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Brozzetti, Francesco, Alessandro Cesare Mondini, Cristina Pauselli, Paolo Mancinelli, Daniele Cirillo, Fausto Guzzetti e Giusy Lavecchia. "Mainshock Anticipated by Intra-Sequence Ground Deformations: Insights from Multiscale Field and SAR Interferometric Measurements". Geosciences 10, n. 5 (15 maggio 2020): 186. http://dx.doi.org/10.3390/geosciences10050186.

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The 2016 Central Italy seismic sequence was characterized by two main events: 24 August, Mw 6, and 30 October, Mw 6.5. We carried out high-resolution field sampling and DInSAR analysis of the coseismic and intra-sequence ground deformations along the Mt Vettore-Mt Bove causative fault (VBF). We found that during the intra-sequence period (24 August–30 October), the ground experienced some deformations whose final patterns seemed to be retraced and amplified by the following mainshock. We interpreted that (i) immediately after the 24 August earthquake, the deformation observed in the southern VBF expanded northwards and westwards over a Length of Deforming Ground (LDG) ranging between 28.7 and 36.3 km, and (ii) it extended to the whole portion of the hanging wall that was later affected by mainshock coseismic deformation. Assuming the LDG to be an indicator for an expected (=coseismic) surface rupture length and using known scaling functions, we obtained 6.4 ≤ Mw ≤ 6.7 for a possible incoming earthquake, which is consistent with the mainshock magnitude. We suggest that the evolution of the ground deformations after a significant seismic event might provide insights on the occurrence of new earthquakes with magnitudes comparable to or larger than the former.

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Efendiev, Yalchin, Juan Galvis e M. Sebastian Pauletti. "Multiscale Finite Element Methods for Flows on Rough Surfaces". Communications in Computational Physics 14, n. 4 (ottobre 2013): 979–1000. http://dx.doi.org/10.4208/cicp.170512.310113a.

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AbstractIn this paper, we present the Multiscale Finite Element Method (MsFEM) for problems on rough heterogeneous surfaces. We consider the diffusion equation on oscillatory surfaces. Our objective is to represent small-scale features of the solution via multiscale basis functions described on a coarse grid. This problem arises in many applications where processes occur on surfaces or thin layers. We present a unified multiscale finite element framework that entails the use of transformations that map the reference surface to the deformed surface. The main ingredients of MsFEM are (1) the construction of multiscale basis functions and (2) a global coupling of these basis functions. For the construction of multiscale basis functions, our approach uses the transformation of the reference surface to a deformed surface. On the deformed surface, multiscale basis functions are defined where reduced (1D) problems are solved along the edges of coarse-grid blocks to calculate nodal multiscale basis functions. Furthermore, these basis functions are transformed back to the reference configuration. We discuss the use of appropriate transformation operators that improve the accuracy of the method. The method has an optimal convergence if the transformed surface is smooth and the image of the coarse partition in the reference configuration forms a quasiuniform partition. In this paper, we consider such transformations based on harmonic coordinates (following H. Owhadi and L. Zhang [Comm. Pure and Applied Math., LX(2007), pp. 675-723]) and discuss gridding issues in the reference configuration. Numerical results are presented where we compare the MsFEM when two types of deformations are used for multiscale basis construction. The first deformation employs local information and the second deformation employs a global information. Our numerical results show that one can improve the accuracy of the simulations when a global information is used.

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Zewail, Rami, e Ahmed Hag-ElSafi. "MULTISCALE SPARSE APPEARANCE MODELING AND SIMULATION OF PATHOLOGICAL DEFORMATIONS". ICTACT Journal on Image and Video Processing 8, n. 1 (1 agosto 2017): 1596–605. http://dx.doi.org/10.21917/ijivp.2017.0225.

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Grondin, F., M. Bouasker, P. Mounanga, A. Khelidj e A. Perronnet. "Physico-chemical deformations of solidifying cementitious systems: multiscale modelling". Materials and Structures 43, n. 1-2 (5 febbraio 2009): 151–65. http://dx.doi.org/10.1617/s11527-009-9477-z.

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Bakhaty, Ahmed A., Sanjay Govindjee e Mohammad R. K. Mofrad. "A Coupled Multiscale Approach to Modeling Aortic Valve Mechanics in Health and Disease". Applied Sciences 11, n. 18 (8 settembre 2021): 8332. http://dx.doi.org/10.3390/app11188332.

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Mechano-biological processes in the aortic valve span multiple length scales ranging from the molecular and cell to tissue and organ levels. The valvular interstitial cells residing within the valve cusps sense and actively respond to leaflet tissue deformations caused by the valve opening and closing during the cardiac cycle. Abnormalities in these biomechanical processes are believed to impact the matrix-maintenance function of the valvular interstitial cells, thereby initiating valvular disease processes such as calcific aortic stenosis. Understanding the mechanical behavior of valvular interstitial cells in maintaining tissue homeostasis in response to leaflet tissue deformation is therefore key to understanding the function of the aortic valve in health and disease. In this study, we applied a multiscale computational homogenization technique (also known as “FE2”) to aortic valve leaflet tissue to study the three-dimensional mechanical behavior of the valvular interstitial cells in response to organ-scale mechanical loading. We further considered calcific aortic stenosis with the aim of understanding the likely relationship between the valvular interstitial cell deformations and calcification. We find that the presence of calcified nodules leads to an increased strain profile that drives further growth of calcification.

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Karmarkar, Aditya P., Xiaopeng Xu e Karim El-Sayed. "Temperature and Process Dependent Material Characterization and Multiscale Stress Evolution Analysis for Performance and Reliability Management under Chip Package Interaction". International Symposium on Microelectronics 2017, n. 1 (1 ottobre 2017): 000013–24. http://dx.doi.org/10.4071/isom-2017-tp13_051.

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Abstract Distinct temperature and process dependent deformation behaviors under packaging temperature cycles are characterized for various packaging materials. Substrate and underfill deformations are described using Maxwell viscoelasticity model. Solder bump deformation is represented by incremental plasticity model. Anisotropic deformation in silicon and orthotropic deformation in substrate are also considered. The material deformation effects on stress evolutions during fabrication and under chip package interaction (CPI) are analyzed for a large package structure. Complex geometries spread over a large range of length scales are simulated using multi-level and multiscale sequential submodeling technique. Global package simulations show that substrate orthotropy has a significant impact on the package warpage during the assembly process. Sequential package assembly simulations are performed to examine the residual stresses at package, bump and interconnect scales. The results show that the package material behaviors during the assembly process affect not only the residual stresses in the large package structure but also in the local bump regions and the interconnect structures. The temperature dependent material non-linear behaviors under operating conditions also affect residual stresses and carrier mobility. This work demonstrates that developing performance and reliability management strategies under CPI should consider temperature and process dependent material deformations during fabrication and packaging.

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Zhou, Tingtao, Katerina Ioannidou, Franz-Josef Ulm, Martin Z. Bazant e R. J. M. Pellenq. "Multiscale poromechanics of wet cement paste". Proceedings of the National Academy of Sciences 116, n. 22 (9 maggio 2019): 10652–57. http://dx.doi.org/10.1073/pnas.1901160116.

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Capillary effects, such as imbibition drying cycles, impact the mechanics of granular systems over time. A multiscale poromechanics framework was applied to cement paste, which is the most common building material, experiencing broad humidity variations over the lifetime of infrastructure. First, the liquid density distribution at intermediate to high relative humidity is obtained using a lattice gas density functional method together with a realistic nanogranular model of cement hydrates. The calculated adsorption/desorption isotherms and pore size distributions are discussed and compare well with nitrogen and water experiments. The standard method for pore size distribution determination from desorption data is evaluated. Second, the integration of the Korteweg liquid stress field around each cement hydrate particle provided the capillary forces at the nanoscale. The cement mesoscale structure was relaxed under the action of the capillary forces. Local irreversible deformations of the cement nanograins assembly were identified due to liquid–solid interactions. The spatial correlations of the nonaffine displacements extend to a few tens of nanometers. Third, the Love–Weber method provided the homogenized liquid stress at the micrometer scale. The homogenization length coincided with the spatial correlation length of nonaffine displacements. Our results on the solid response to capillary stress field suggest that the micrometer-scale texture is not affected by mild drying, while nanoscale irreversible deformations still occur. These results pave the way for understanding capillary phenomena-induced stresses in heterogeneous porous media ranging from construction materials to hydrogels and living systems.

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Sotiropoulos, Gerasimos, e Vissarion Papadopoulos. "Nonlinear multiscale modeling of thin composite shells at finite deformations". Computer Methods in Applied Mechanics and Engineering 391 (marzo 2022): 114572. http://dx.doi.org/10.1016/j.cma.2022.114572.

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Più fonti

Tesi sul tema "Multiscale deformations"

Song, Jin E. "Hierarchical multiscale modeling of Ni-base superalloys". Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34855.

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Ni-base superalloys are widely used in hot sections of gas turbine engines due to the high resistance to fatigue and creep at elevated temperatures. Due to the demands for improved performance and efficiency in applications of the superalloys, new and improved higher temperature alloy systems are being developed. Constitutive relations for these materials need to be formulated accordingly to predict behavior of cracks at notches in components under cyclic loading with peak dwell periods representative of gas turbine engine disk materials. Since properties are affected by microstructure at various length scales ranging from 10 nm tertiary γ' precipitates to 5-30 μm grains, hierarchical multiscale modeling is essential to address behavior at the component level. The goal of this work is to develop a framework for hierarchical multiscale modeling network that features linkage of several fine scale models to incorporate relevant microstructure attributes into the framework to improve the predictability of the constitutive model. This hierarchy of models is being developed in a collaborative research program with the Ohio State University. The fine scale models include the phase field model which addresses dislocation dissociation in the γ matrix and γ' precipitate phases, and the critical stresses from the model are used as inputs to a grain scale crystal plasticity model in a bottom-up fashion. The crystal plasticity model incorporates microstructure attributes by homogenization. A major task of the present work is to link the crystal plasticity model, informed by the phase field model, to the macroscale model and calibrate models in a top-down fashion to experimental data for a range of microstructures of the improved alloy system by implementing a hierarchical optimization scheme with a parameter clustering strategy. Another key part of the strategy to be developed in this thesis is the incorporation of polycrystal plasticity simulations to model a large range of virtual microstructures that have not been experimentally realized (processed), which append the experimentally available microstructures. Simulations of cyclic responses with dwell periods for this range of virtual (and limited experimental) polycrystalline microstructures will be used to (i) provide additional data to optimize parameter fitting for a microstructure-insensitive macroscopic internal state variable (ISV) model with thermal recovery and rate dependence relevant to the temperatures of interest, and (ii) provide input to train an artificial neural network that will associate the macroscopic ISV model parameters with microstructure attributes for this material. Such microstructure sensitive macroscopic models can then be employed in component level finite element studies to model cyclic behavior with dwell times at smooth and cracked notched specimens.

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Shepherd, James Ellison. "Multiscale Modeling of the Deformation of Semi-Crystalline Polymers". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10479.

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The mechanical and physical properties of polymers are determined primarily by the underlying nano-scale structures and characteristics such as entanglements, crystallites, and molecular orientation. These structures evolve in complex manners during the processing of polymers into useful articles. Limitations of available and foreseeable computational capabilities prevent the direct determination of macroscopic properties directly from atomistic computations. As a result, computational tools and methods to bridge the length and time scale gaps between atomistic and continuum models are required. In this research, an internal state variable continuum model has been developed whose internal state variables (ISVs) and evolution equations are related to the nano-scale structures. Specifically, the ISVs represent entanglement number density, crystal number density, percent crystallinity, and crystalline and amorphous orientation distributions. Atomistic models and methods have been developed to investigate these structures, particularly the evolution of entanglements during thermo-mechanical deformations. A new method has been created to generate atomistic initial conformations of the polymer systems to be studied. The use of the hyperdynamics method to accelerate molecular dynamics simulations was found to not be able to investigate processes orders of magnitude slower that are typically measurable with traditional molecular dynamics simulations of polymer systems. Molecular dynamics simulations were performed on these polymer systems to determine the evolution of entanglements during uniaxial deformation at various strain rates, temperatures, and molecular weights. Two methods were evaluated. In the first method, the forces between bonded atoms along the backbone are used to qualitatively determine entanglement density. The second method utilizes rubber elasticity theory to quantitatively determine entanglement evolution. The results of the second method are used to gain a clearer understanding of the mechanisms involved to enhance the physical basis of the evolution equations in the continuum model and to derive the models material parameters. The end result is a continuum model that incorporates the atomistic structure and behavior of the polymer and accurately represents experimental evidence of mechanical behavior and the evolution of crystallinity and orientation.

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Shehadeh, Mu'Tasem A. "Modeling of high strain rate and strain localization in FCC single crystals multiscale dislocation dynamics analyses /". Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Spring2005/M%5FShehadeh%5F050405.pdf.

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Abou, Orm Lara. "VMS (Variational MultiScale) stabilization for Stokes-Darcy coupled flows in porous media undergoing finite deformations : application to infusion-based composite processing". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00966922.

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Resin infusion-based processes are good candidates for manufacturing thin composite materials parts such as those used in aeronautics for instance. These processes consist in infusing a liquid resin into a stacking of fibrous preforms under the action of a mechanical pressure field applied onto this stacking where a stiff- distribution medium is also placed to create a resin feeding. Both physical and mechanical properties of the final pieces are rather difficult to predict and control. Numerical simulation are perfectly suited to master these processes. In the present work a numerical finite element modeling framework is proposed to simulate infusion processes. The flow of the assumed Newtonian resin is described in the distribution medium, a highly porous medium, through Stokes' equations and through Darcy's equations in the fibrous preforms, very low permeability media. This coupled Stokes-Darcy flow is modeled in a monolithic approach which consists in using a single mesh for both media. The mixed velocity- pressure formulation is then discretized by linear-linear finite elements, stabilized by a so-called ASGS multi-scale approach. Both Stokes-Darcy interface and fluid front are represented individually thanks to "Level-Set" functions, and some specific coupling conditions are prescribed on the interface separating both fluid and porous media. During the process, orthotropic preforms undergo finite strains, either during the compaction stage when resin is not yet present, or during resin infusion. Resin pressure then tends to make the preforms swell. Preforms deformations are represented through an updated Lagrangian formulation for finite deformations. Dry preforms possess a non-linear elastic behaviour in their transverse direction - across their thickness- given by existing experimental measurements. The effect of the presence of resin in the wet preforms is accounted for using a Terzaghi's equivalent model. Also, when preforms deform their porosity will change, and so will their permeability, modifying the resin flow. A Carman-Kozeny model is then used to relate porosity and permeability. After the Stokes-Darcy coupling is validated both on numerous tests cases and using the method of manufactured solutions, various 2D and 3D simulations of injection and infusion-based processes are analyzed.The latter includ- ing preform deformations along with resin flow. Comparisons with existing experimental measurements permit to validate the approach on a simple geometry. Last, some ex- tensions to more complex 3D cases are proposed as outlooks, including curvatures and thickness variations.

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Brown, Stephen. "Analyse structurale et âge des déformations cassantes à micro- et méso-échelle dans un bassin sédimentaire intracontinental : le cas du Bassin de Paris". Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1325.

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Le domaine intracontinental est éloigné des limites des plaques tectoniques sur lesquelles sont localisées l’essentiel des déformations. La déformation intraplaque est une conséquence de la transmission de la contrainte depuis les limites de plaques vers le domaine intraplaque. Elle peut s’exprimer par un flambage lithosphérique, par des déformations régionales et des réseaux de fractures à micro- et méso-échelle. Ces déformations reflètent la nature des régimes de contraintes aux limites des plaques continentales. Elles ont une distribution hétérogène et à l'échelle régionale, révèlent souvent les directions d'un cadre structural préexistant. Le rôle de cet héritage structural à l'échelle micro et méso reste cependant mal compris. Ce travail de thèse se concentre sur les déformations cassantes à micro- (millimétrique à centimétrique) et méso-échelle (centimétrique à métrique) du domaine intra-plaque.Dans les zones urbaines avec des infrastructures souterraines importantes, il est essentiel de mieux comprendre la géométrie et la distribution des réseaux de fractures. Ces réseaux contrôlent, dans une certaine mesure, la dynamique de la circulation des fluides souterrains. Dans le cadre de cette thèse, la distribution, les géométries, les cinématiques et les chronologies relatives et absolues de ces déformations intraplaques ont été étudiées dans le Bassin de Paris. Pour ce faire, nous avons utilisé une approche multi-technique combinant travail de terrain et de laboratoire, afin d'aborder à deux échelles différentes : la micro-échelle et la méso-échelle. Les différentes méthodes utilisées sont l’inversion des données microtectoniques pour remonter à des paleo-contraintes, la datation absolue U-Pb des calcites de veines et de faille, et l'inversion des données de susceptibilité magnétique et de vitesse des ondes P afin de caractériser les microstructures internes des échantillons de roches.Les résultats nous permettent de proposer un modèle de déformations intraplaques dans le Bassin de Paris et de discuter du lien avec les événements géodynamiques de l'Europe occidentale tels que les orogénèses pyrénéenne et alpine et le système de rifting cénozoïque européen (ECRIS).Les données montrent que les déformations intraplaques dans le Bassin de Paris sont plus qu'une simple réactivation des discontinuités du socle. Ces déformations s’expriment via un vaste réseau de joints cassants, et sous forme de réseaux de failles, bien que plus rares. Enfin, grâce à la datation U-Pb de la calcite, nous montrons que la chronologie du réseau de failles spatialement hétérogène est surtout contemporaine des phases paroxysmales de déformation de l'orogenèse pyrénéenne. Ainsi, les champs de paléocontraintes déduits de l’inversion des plans de failles datés indiquent davantage l'orientation de la compression pyrénéenne que celle de la compression alpine ou de l'extension de l'ECRIS. Enfin, l'anisotropie de la vitesse des ondes P suggère que le réseau interne de fractures microstructurales des échantillons de craie reflète la nature géométrique des joints mesurés sur le terrain
The intracontinental domain is located far from tectonic plate margins, where significant stress can accumulate. Deformation of the intraplate domain is a consequence of stress transmission from plate boundaries. It results in lithospheric buckling, regional deformations, and meso to microscale fracture networks. These intraplate deformations reflect the nature of stress regimes at continental plate boundaries. They often have a heterogeneous distribution, and on a regional scale, are frequently impacted by the directions of pre-existing faults or weaknesses. The role of a structural inheritance remains to be shown on a micro and mesoscale.Understanding intraplate deformation is crucial for assessing geological hazards and fluid circulation in the context of subsurface solicitation. This is especially true in densely populated areas with substantial underground infrastructure. In this PhD, we investigate the geometries, distribution, kinematics, and timing of these intraplate deformations within the intracontinental Paris Sedimentary Basin, with the city of Paris at its center.To achieve this and to attempt to link the different scales of structures, we use multiple techniques, combining fieldwork and laboratory work, in order to approach the problem from two different scales: the mesoscale (metric to centimetric) and microscale (centimetric to millimetric). The structural analyses include calculating paleostress fields from microtectonic data collected in the field and in-situ U-Pb absolute dating of synkinematic calcites and calcitic veins. The microscale is investigated through the inversion of magnetic susceptibility and P-wave velocity data to characterize the internal microstructures of rock samples.The data show that an extensive network of multi-directional brittle joints exists and is expressed at different scales. In chalk samples for example, the measured anisotropy of P-wave velocity reflects the directions of mesoscale joints measured in the field. When the applied shear stress exceeds the shear strength of the joint, failure occurs. This can manifest as sliding or fracturing along the joint plane. Thus, some of the joints are reactivated later. Evidences of faulting, while less common than joints, also exist in the Paris Basin. Calculated paleostress tensors indicate mostly strike-slip faulting regimes with maximal principal stress axes (sigma1) roughly N-S. This direction is concordant with the N-S orientation of Pyrenean compression more so than Alpine compression or Tertiary extension at the origin of the European rifted continental basins. Furthermore, through in-situ U-Pb dating of calcite mineralized along fault planes or within veins, we show that the Late Cretaceous to Eocene timing of the fault network is more aligned with the Pyrenean Orogeny than the Alpine Orogeny or the European Cenozoic Rift System (ECRIS)

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Brödling, Nils. "Multiscale modeling of fracture and deformation in interface controlled materials". [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-36166.

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Shashkov, Ivan. "Multiscale study of the intermittency of plastic deformation by acoustic emission method". Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0326/document.

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Les études récentes de la déformation plastique à l'aide de techniques expérimentales à haute résolution témoignent que les processus de déformation sont souvent caractérisés par des effets collectifs qui émergent à une échelle mésoscopique, intermédiaire entre celle de défauts cristallins et celle d'une éprouvette macroscopique. Notamment, la méthode de l'émission acoustique (EA) révèle, dans divers conditions expérimentales, l'intermittence de la déformation plastique, qui se manifeste par une propriété de l'invariance d'échelle, caractéristique de phénomènes d'auto-organisation. L'objectif de la thèse a été d'étudier la structure inhérente de l'EA pour différents mécanismes de déformation plastique, d'examiner sa dépendance à la vitesse de déformation et à l'écrouissage du matériau, et d'appréhender les liens entre les petites échelles de temps, liées à l'organisation des défauts, et celles qui relèvent de l'approche continue de la plasticité. L'étude a été réalisée sur des alliages AlMg et des alliages base Mg, dont la déformation plastique est accompagnée d'une forte activité acoustique et contrôlée par différents mécanismes physiques : l'effet Portevin-Le Chatelier (PLC) dans les premiers et une combinaison du maclage et du glissement des dislocations dans les deuxièmes. L'utilisation de la technique d'enregistrement continue de l'EA ("data streaming") a permis de montrer que le comportement apparent - discrète ou continue - de l'EA accompagnant l'effet PLC dépend de l'échelle de temps d'observation et du paramètre physique étudié. Cependant, contrairement à une vision traditionnelle, il se trouve que l'EA a un caractère intermittent pendant l'écoulement macroscopiquement lisse tant que pendant l'instabilité macroscopique de la déformation plastique. Grace aux méthodes d'analyse issues de la théorie des systèmes dynamiques non linéaires, telles que l'analyse multifractale, une tendance à la transition entre la dynamique invariante d'échelle et les comportements caractérisés par des échelles intrinsèques a été trouvée lors de l'écrouissage des matériaux. Enfin, nous avons prouvé que les distributions statistiques en loi puissance persistent dans des larges intervalles de variation des paramètres, conventionnellement utilisés pour individualiser les événements acoustiques. Ce résultat est d'une importance générale car il s'applique à tous les processus avalancheux émergeant dans différents systèmes dynamiques
Recent studies of plastic deformation using high-resolution experimental techniques testify that deformation processes are often characterized by collective effects that emerge on a mesoscopic scale, intermediate between the scale of individual crystal defects and that of the macroscopic sample. In particular, the acoustic emission (AE) method reveals intermittency of plastic deformation in various experimental conditions, which is manifested by the property of scale invariance, a characteristic feature of self-organized phenomena. The objective of the dissertation was to study the inherent structure of AE for different mechanisms of plastic deformation, to examine its dependence on the strain rate and strain hardening of the material, and to understand the relationships between short time scales related to organization of defects and those relevant to the continuous approach of plasticity. The study was performed on AlMg and Mg-based alloys, the plastic deformation of which is accompanied by a strong acoustic activity and controlled by different physical mechanisms: the Portevin-Le Chatelier (PLC) effect in the first case and a combination of twinning and dislocation glide in the second case. Application of a technique of continuous AE recording ("data streaming") allowed proving that the apparent behavior, discrete or continuous, of AE accompanying the PLC effect depends on the time scale of observation and the physical parameters surveyed. However, unlike the traditional view, it appears that AE has an intermittent character during both stress serrations and macroscopically smooth flow. Using methods of the theory of nonlinear dynamical systems, such as the multifractal analysis, a tendency to a transition between the scale-invariant dynamics and the behaviors characterized by intrinsic scales was detected during work hardening. Finally, we proved that the power-law statistical distributions persist in wide ranges of variation of parameters conventionally used to individualize acoustic events. This result is of general importance because it applies to all avalanche-like processes emerging in dynamical systems

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Wang, Ruoya. "Novel theoretical and experimental frameworks for multiscale quantification of arterial mechanics". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47718.

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The mechanical behavior of the arterial wall is determined by the composition and structure of its internal constituents as well as the applied traction-forces, such as pressure and axial stretch. The purpose of this work is to develop new theoretical frameworks and experimental methodologies to further the understanding of arterial mechanics and role of the various intrinsic and extrinsic mechanically motivating factors. Specifically, residual deformation, matrix organization, and perivascular support are investigated in the context of their effects on the overall and local mechanical behavior of the artery. We propose new kinematic frameworks to determine the displacement field due to residual deformations previously unknown, which include longitudinal and shearing residual deformations. This allows for improved predictions of the local, intramural stresses of the artery. We found distinct microstructural differences between the femoral and carotid arteries from non-human primates. These arteries are functionally and mechanically different, but are geometrically and compositionally similar, thereby suggesting differences in their microstructural alignments, particularly of their collagen fibers. Finally, we quantified the mechanical constraint of perivascular support on the coronary artery by mechanically testing the artery in-situ before and after surgical exposure.

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Brödling, Nils [Verfasser]. "Multiscale modeling of fracture and deformation in interface controlled materials / vorgelegt von Nils C, Brödling". Stuttgart : Max-Planck-Inst. für Metallforschung, 2007. http://d-nb.info/995392145/34.

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Thuramalla, Naveen. "MULTISCALE MODELING AND ANALYSIS OF FAILURE AND STABILITY DURING SUPERPLASTIC DEFORMATION -- UNDER DIFFERENT LOADING CONDITIONS". UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/323.

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Superplastic forming (SPF) is a valuable near net shape fabrication method, used to produce very complex, contoured and monolithic structures that are often lighter, stronger and safer than the assemblies they replace. However, the widespread industrial use of Superplastic (SP) alloys is hindered by a number of issues including low production rate and limited predictive capabilities of stability during deformation and failure. Failure during SPD may result from geometrical macroscopic instabilities and/or microstructural aspects. However, the available failure criteria are either based on geometrical instabilities or microstructural features and do not account for both failure modes. The present study presents a generalized multi-scale stability criterion for SP materials, accounting for both aspects of failure under various loading conditions. A combined model accounting for cavity nucleation and plasticity controlled cavity growth along with a grain growth model and a modified microstructure based constitutive equation for SP materials is incorporated into Harts stability analysis to develop the proposed stability criterion for different loading conditions. Effects of initial grain size, initial levels of cavitation, nucleation strain, strain-rate sensitivity, and grain-growth exponent on the optimum forming curves of different SP alloys are investigated, for different loading conditions.

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Libri sul tema "Multiscale deformations"

Piero, Gianpetro, e David R. Owen, a cura di. Multiscale Modeling in Continuum Mechanics and Structured Deformations. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4.

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Fan, Jinghong. Multiscale analysis of deformation and failure of materials. Chichester, West Sussex: Wiley, 2011.

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Chuang, T. J., e J. W. Rudnicki. Multiscale deformation and fracture in materials and structures: The James R. Rice 60th anniversary volume. New York: Kluwer Academic Publishers, 2002.

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EMMM-2007, (2007 Moscow Russia). Electron microscopy and multiscale modeling: Proceedings of the EMMM-2007 international conference, Moscow, Russia, 3-7 September 2007. [Melville, N.Y.]: American Institute of Physics, 2008.

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Fan, Jinghong. Multiscale Analysis of Deformation and Failure of Materials. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470972281.

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Chuang, T. J., e J. W. Rudnicki, a cura di. Multiscale Deformation and Fracture in Materials and Structures. Dordrecht: Kluwer Academic Publishers, 2002. http://dx.doi.org/10.1007/0-306-46952-9.

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Pasternak, Elena, e Arcady Dyskin, a cura di. Multiscale Processes of Instability, Deformation and Fracturing in Geomaterials. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-22213-9.

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J, Chuang T., Rudnicki J. W e Rice J. R, a cura di. Multiscale deformation and fracture in materials and structures: The James R. Rice 60th anniversary volume. Dordrecht: Kluwer Academic Publishers, 2001.

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Piero, Gianpetro Del, e Owen David R. Multiscale Modeling in Continuum Mechanics and Structured Deformations. Springer London, Limited, 2014.

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Fan, Jinghong. Multiscale Analysis of Deformation and Failure of Materials. Wiley & Sons, Incorporated, John, 2011.

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Capitoli di libri sul tema "Multiscale deformations"

Niemunis, Andrzej, e Felipe Prada. "PARAELASTIC DEFORMATIONS IN HYPOPLASTICITY". In Multiscale and Multiphysics Processes in Geomechanics, 29–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19630-0_8.

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Deseri, L. "Crystalline Plasticity and Structured Deformations". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 203–30. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_6.

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Piero, Gianpietro. "Foundations of the Theory of Structured Deformations". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 125–75. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_4.

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Paroni, Roberto. "Second-Order Structured Deformations: Approximation Theorems and Energetics". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 177–202. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_5.

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Šilhavý, M. "Energy Minimization for Isotropic Nonlinear Elastic Bodies". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 1–51. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_1.

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Le, Khanh Chau. "Variational problems of crack equilibrium and crack propagation". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 53–81. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_2.

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Marigo, Jean-Jacques. "Griffith Theory Revisited". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 83–123. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_3.

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Owen, David R. "Elasticity with Disarrangements". In Multiscale Modeling in Continuum Mechanics and Structured Deformations, 231–75. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2770-4_7.

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Levitas, Valery I. "Phase Transformations Under High Pressure and Large Plastic Deformations: Multiscale Theory and Interpretation of Experiments". In Proceedings of the International Conference on Martensitic Transformations: Chicago, 3–10. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76968-4_1.

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Wang, Jielong. "Motion and Deformation". In Multiscale Multibody Dynamics, 59–97. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8441-9_2.

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Atti di convegni sul tema "Multiscale deformations"

Lu, Jing. "Multiscale modeling of large deformations in 3-D polycrystals". In MATERIALS PROCESSING AND DESIGN: Modeling, Simulation and Applications - NUMIFORM 2004 - Proceedings of the 8th International Conference on Numerical Methods in Industrial Forming Processes. AIP, 2004. http://dx.doi.org/10.1063/1.1766791.

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Tyumentsev, Alexander N., Anatoly S. Avilov, Sergei L. Dudarev e Laurence D. Marks. "Metal Microstructure After Large Plastic Deformations: Models and TEM Possibilities". In ELECTRON MICROSCOPY AND MULTISCALE MODELING- EMMM-2007: An International Conference. AIP, 2008. http://dx.doi.org/10.1063/1.2918113.

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Maniatty, Antoinette, Karel Matous e Jing Lu. "Multiscale Modeling of Large Deformation Processes in Polycrystalline Metals". In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43634.

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A mesoscale model for predicting the evolution of the grain structure and the mechanical response of polycrystalline aggregates subject to large deformations, such as arise in bulk metal forming processes, is presented. The gain structures modeled are either experimentally observed or are computer generated and statistically similar to experimentally observed grain structures. In order to capture the inhomogeneous deformations and the resulting grain structure characteristics, a discretized model at the mesoscale is used. This work focuses on Al-Mg-Si alloys. Scale bridging is used to link to the macroscale. Examples involving two-dimensional grain structures and current work on three-dimensional grain structures are presented. The present work provides a framework to model the mesoscopic behavior and interactions between grains during finite strains. The mesoscale is characterized by a statistically representative voluem element (RVE), which contains the grains of a polycrystal. Experimentally observed grain structures are used both as models directly (for two-dimensional cases) and to define statistical characteristics to verify the similarity of computer generated grain structures (for three-dimensional cases). A Monte Carlo method based on the Potts model is used to define three-dimensional grain structures. In order to make the representative grain structure appropriate for scale-bridging, we design them with periodicity. A three-field, updated Lagrangian finite element formulation with a kinematic split of the deformation gradient into volume preserving and volumetric parts is used to create a stable finite element method in the context of nearly incompressible behavior. A fully implicit two-level backward Euler integration scheme is derived for integrating the constitutive equations, and consistent linearization is used in Newton’s method to solve the resulting equations. In addition, the average of the boundary conditions and bulk response must match the macroscopically measured bulk response. To illustrate and verify the proposed model, we analyze examples involving two-dimensional grain structures and compare with results from a Taylor model. Current work on three-dimensional grain structures ara also presented.

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Sibole, Scott, e Ahmet Erdemir. "A Pipeline for High Throughput Post-Processing of Joint and Tissue Simulations for Estimation of Cell Level Deformations". In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53749.

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In biomechanics, the search for a better understanding of multiscale spatial interactions has become an increasingly desirable objective, in order to establish the causal mechanical relationships between the loading of joints, tissues, and cells. Experimental acquisition of mechanical data, while attainable [1], becomes more difficult to obtain as the spatial scale decreases. If one attempts to gather data at different spatial scales simultaneously, also under lifelike loading scenarios, the present technology is limited. Computational modeling, particularly when conducted in a multiscale fashion, may provide solutions and has often been employed to span spatial scales.

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Zhu, Qiang, Zhangli Peng e Robert J. Asaro. "Investigation of RBC Remodeling With a Multiscale Model". In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13121.

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Erythrocyte (red blood cell, or RBC) possesses one of the simplest and best characterized molecular architectures among all cells. It contains cytosol enclosed inside a composite membrane consisting of a fluidic lipid bilayer reinforced by a single layer of protein skeleton pinned to it. In its normal state, this system demonstrates tremendous structural stability, manifested in its ability to sustain large dynamic deformations during circulation. On the other hand, it has been illustrated in experiments that triggered by mechanical loads structural remodeling may occur. A canonical example of this remodeling is vesiculation, referring to the partial separation of the lipid bilayer from the protein skeleton and the formation of vesicles that contain lipids only.

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Weinberg, Eli, e Mohammad Mofrad. "Multiscale Fluid-Structure Simulations of the Aortic Valve". In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176730.

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In the heart aortic valve, maintenance of healthy conditions and transition to diseased conditions are modulated by the cells in the valve. The cells found within the valve leaflets and walls are the valvular interstitial cells (VICs), and those found on the fluid-facing surfaces are the endothelial cells (ECs). Both types of cell are known to respond to their mechanical state; that is, the stresses and deformations imposed on the cell by its surrounding environment. Here, we present a set of simulations to examine the mechanical states of cells as the valve goes through its opening and closing cycle. The simulations span the cell, tissue, and organ length scales. Taken together, these simulations predict the dynamic, three-dimensional mechanical state of VICs and ECs throughout the valve.

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Maute, K., M. L. Dunn, R. Bischel, M. Howard e J. M. Pajot. "Multiscale Design of Vascular Plates". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82203.

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Inspired by actuation mechanisms in plant structures and motivated by recent advances in electro-chemically driven micro-pumps, this paper is concerned with a novel concept for active materials based on distributed hydraulic actuation. Due to the similarity of the actuation principles seen in plants undergoing nastic motion, we refer to this class of active materials as nastic materials. We present a mechanical modeling approach for nastic materials representing the effects of pressure generation and fluid transport by incompressible eigenstrains. This model is embedded into a two-level macro/micro topology optimization procedure. On a macroscopic level, the integration of nastic material into a structural system is optimized. The placement and distribution of nastic material on a flexible substrate are optimized to generate target displacement and force distributions. On a microscopic level, the stress and strain generation is tailored to desired macroscopic material properties by optimizing the layout of vascular fluid channels embedded in an elastic matrix. For the layout optimization of vascular fluid channels, a novel topology optimization procedure is presented that models the effects of pressure along the fluid channels via an analogy with thermal conduction and convection. For this purpose an auxiliary heat transfer problem is solved. The macro-scale optimization procedure is studied for plate structures patterned by nastic materials in order to generate target bending and twist deformations. The results show the significant differences of the optimal distributions of active material depending on the strain model used for representing the actuation concept. The micro-scale vascular design methodology is verified with plane-stress examples. The results show that the layout of fluid channels can be optimized such that target strains are generated.

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Weinberg, Eli J., e Mohammad R. K. Mofrad. "Multiscale Simulations of the Healthy and Calcific Human Aortic Valve". In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192671.

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In the heart’s aortic valve, maintenance of a healthy state and transition to disease states are modulated by the cells in the valve. The cells found within the valve leaflets are valvular interstitial cells (VICs) and those found on the fluid-facing surfaces are endothelial cells (ECs). Both types of cell are known to respond to their mechanical state; that is, the stresses and deformations imposed on a cell by its surrounding environment. Here we present a set of simulations to examine these mechanical states of the cells as the valve goes through its opening and closing cycle. We have created models at each of the cell, tissue, and organ length scales and introduced a system of reference configurations to link the scales. Each simulation and the set of multiscale simulation are verified against experimental data. This multiscale simulation approach allows us to accurately predict the dynamic, three-dimensional mechanical state of cells throughout the valve.

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Rossi, Paolo, Cristina Castagnetti, Stefano Cattini, Giorgio Di Loro, Francesca Grassi, Luigi Parente, Sara Righi, Luigi Rovati, Roberto Simonini e Alessandro Capra. "Monitoring of underwater animal forests: geometry and biometry". In 5th Joint International Symposium on Deformation Monitoring. Valencia: Editorial de la Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/jisdm2022.2022.13891.

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The development and testing of innovative technologies and automated data analysis methodologies offer tools for investigations in numerous scenarios including the monitoring of complex marine ecosystems and the direct and indirect effects of climate change on natural heritage. In the underwater environment, the creation of products with accurate metric and colorimetric content is a scientific and technological challenge, that can offer tools for new investigations including the monitoring of ecosystems and the study of biodiversity. The research group developed a technological solution consisting of a remotely operating platform and a measuring system that includes RGB and fluorescence optical sensors for the 3D reconstruction of the underwater environment and the study of the health-state of investigated species. The proposed solution aspires to high-accuracy multiscale reconstruction of underwater animal forests with a special focus on metric content. Methodologies and technical solutions for the management and calibration of the system have been developed: the design of proper calibration frames and the fluorescence sensor, the choice of a proper illumination system, the implementation of the system on a customizable Remotely Operating Vehicle, the integration of the different sensors, the combination of metric and colorimetric results for monitoring the occurred deformations and the health status. The results of laboratory activities and preliminary tests on field tests are discussed.

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Halloran, Jason, Scott Sibole e Ahmet Erdemir. "Three Dimensional Cellular Loading and Average Microstructural Tissue Response Using Single and Three Cell Models". In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53663.

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Finite element analysis of single cells embedded in an extracellular matrix have been used widely to provide new insights into the cellular loading in cartilage [1] and meniscus [2]. Deformations derived from a homogeneous tissue model are generally used to drive simulations using microstructural representations. Implicit in this setup is the assumption of the equivalence of macrostructural (tissue) constitutive response and average stress-strain response of the microstructural (cellular) model. Higher cell densities within tissue volume [3] may increase the uncertainty introduced by this assumption and may also influence how macroscopic loads are transferred to the cells. We have previously shown, albeit with a two-dimensional simulation, the potential mismatches in such variables for increasing strain level and cell density, specifically for no cell, one, and three cell representations [4]. Hence, the objective of this study was to quantify the differences between the overall response and cellular deformation in three-dimensional nonlinearly elastic microstructural cartilage models embedded with either one or three cells. Multiscale coupling approaches targeting prediction of cell deformations from tissue and/or organ level loading will likely benefit from this investigation while balancing computational demand with accuracy requirements.

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Rapporti di organizzazioni sul tema "Multiscale deformations"

McDowell, David L. Evolving Multiscale Deformation and Damage in Polycrystals. Fort Belvoir, VA: Defense Technical Information Center, agosto 2003. http://dx.doi.org/10.21236/ada416378.

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Shen, Yu-Lin, e Tariq Khraishi. A Framework for Multiscale Modeling of Deformation in Crystalline Solids. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2006. http://dx.doi.org/10.21236/ada444522.

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Hou, Thomas, Yalchin Efendiev, Hamdi Tchelepi e Louis Durlofsky. Multiscale Simulation Framework for Coupled Fluid Flow and Mechanical Deformation. Office of Scientific and Technical Information (OSTI), maggio 2016. http://dx.doi.org/10.2172/1254120.

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Tchelepi, Hamdi. Multiscale Simulation Framework for Coupled Fluid Flow and Mechanical Deformation. Office of Scientific and Technical Information (OSTI), novembre 2014. http://dx.doi.org/10.2172/1164145.

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Ghoniem, Nasr M. Multiscale Modeling of Deformation, Fracture and Failure of Fusion Materials and Structures Final Report. Office of Scientific and Technical Information (OSTI), novembre 2017. http://dx.doi.org/10.2172/1415926.

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Nasr M. Ghoniem e Nick Kioussis. Multiscale Modeling of the Deformation of Advanced Ferritic Steels for Generation IV Nuclear Energy. Office of Scientific and Technical Information (OSTI), aprile 2009. http://dx.doi.org/10.2172/953345.

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Andrade, JosÃÂ© E., e John W. Rudnicki. Multiscale framework for predicting the coupling between deformation and fluid diffusion in porous rocks. Office of Scientific and Technical Information (OSTI), dicembre 2012. http://dx.doi.org/10.2172/1057395.

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Buehler, Markus J. Differential Multiscale Modeling of Chemically Complex Materials under Heavy Deformation: Biological, Bioinspired and Synthetic Hierarchical Materials. Fort Belvoir, VA: Defense Technical Information Center, giugno 2010. http://dx.doi.org/10.21236/ada533318.

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Sparks, Paul, Jesse Sherburn, William Heard e Brett Williams. Penetration modeling of ultra‐high performance concrete using multiscale meshfree methods. Engineer Research and Development Center (U.S.), settembre 2021. http://dx.doi.org/10.21079/11681/41963.

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Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistance over conventional strength concrete. Developing predictive numerical models of UHPC subjected to penetration is critical in understanding the material's enhanced performance. This study employs the advanced fundamental concrete (AFC) model, and it runs inside the reproducing kernel particle method (RKPM)‐based code known as the nonlinear meshfree analysis program (NMAP). NMAP is advantageous for modeling impact and penetration problems that exhibit extreme deformation and material fragmentation. A comprehensive experimental study was conducted to characterize the UHPC. The investigation consisted of fracture toughness testing, the utilization of nondestructive microcomputed tomography analysis, and projectile penetration shots on the UHPC targets. To improve the accuracy of the model, a new scaled damage evolution law (SDEL) is employed within the microcrack informed damage model. During the homogenized macroscopic calculation, the corresponding microscopic cell needs to be dimensionally equivalent to the mesh dimension when the partial differential equation becomes ill posed and strain softening ensues. Results of numerical investigations will be compared with results of penetration experiments.

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Stanek, Christopher, Carlos Tome, Robert Montgomery e Wengfeng Liu. FY14.CASL.012, L2:MPO.P9.03 Demonstration of Atomistically-�informed Multiscale Zr Alloy Deformation Models in Peregrine for Normal and Accident Scenarios. Office of Scientific and Technical Information (OSTI), ottobre 2014. http://dx.doi.org/10.2172/1159210.

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