Download or read book Quantifying Heterogeneous Deformation written by Eric Horsman and published by . This book was released on 2006 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quantification of Regional Myocardial Deformation Normal Characteristics and Clinical Use in Ischaemic Heart Disease written by Lieven Herbots and published by Leuven University Press. This book was released on 2006 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quantification of Deformation Processes in the Torlesse Accretionary Wedge New Zealand written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract:In this study deformation processes in the Torlesse accretionary wedge (New Zealand) are quantified in order to get information on the dynamics of accretionary wedges. Absolute and relative strain measurements show a heterogeneous deformation in the Torlesse wedge. The regional deformation was estimated by using a tensor average calculation, that takes into account single local strain measurements. The calculation reveals an uniaxial shortening along a subvertical maximum shortening axis. Absolute strain measurements on low grade metasandstones additionally prove an average volume loss of c. 20 SiO2. A geochemical mass balance analysis was used to estimate volume change in deeper crustal levels. Chemical compositions in higher grade rocks differ from the protolith compositions depending on the degree of volume deformation and thus show volume loss of 15% SiO2. Sinks for the dissolved material are not known, therefore a transport of the material out of the wedge must be assumed. Strain results also reveal information on the degree of coupling between the accretionary wedge and the subducting plate. Measured shear strains in the rocks are clearly lower than the expected shear values, which were calculated by using a simple model that takes into account different plate convergence velocities and exhumation rates. This proves that the Torlesse wedge was strongly decoupled from the subducted pacific plate and the deformation was mainly influenced by the flow of sediments in and out of the wedge.

Download or read book Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys written by Chengyang Mo and published by . This book was released on 2017 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deformation twinning plays a dominant role in plastic deformation of hexagonal close-packed (hcp) polycrystalline materials. Furthermore, stain localizations were previously found to be related to twinning in Magnesium alloys. To date, experiments performed at the specimen level demonstrated the formation of strain localizations at locations with pronounced twin activity. The research work presented in this dissertation attempts to quantitatively identify correlations between strain localizations and twinning activity in magnesium. This is achieved by in-situ microstructure monitoring coupled with nondestructive evaluation techniques such as acoustic emission and digital image correlation. Characteristics of acoustic emission signals from twinning are identified through a combination of mechanical testing using a variety of specimens ranging from single to polycrystals in addition to testing both inside and outside the Scanning Electron Microscope as well as machine learning techniques. A novel approach to perform quasi in-situ cyclic loading was implemented allowing full field strain measurement as well as microstructure characterization at key stages of cyclic loading. Given this approach, the contribution of twinning in the measured plastic strain was possible to be directly calculated from microstructure information during cyclic loading conditions. In addition, such microstructure-related plastic strain was demonstrated to have strong correlation with macroscopic heterogeneous strain field measured by digital image correlation. The experimental findings in this dissertation can provide key inputs to models attempting to predict deformation behavior of magnesium alloys using microstructural information.

Download or read book The Virtual Fields Method written by Fabrice Pierron and published by Springer Science & Business Media. This book was released on 2012-03-21 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Virtual Fields Method: Extracting Constitutive Mechanical Parameters from Full-field Deformation Measurements is the first and only one on the Virtual Fields Method, a recent technique to identify materials mechanical properties from full-field measurements. It contains an extensive theoretical description of the method as well as numerous examples of application to a wide range of materials (composites, metals, welds, biomaterials etc.) and situations(static, vibration, high strain rate etc.). Finally, it contains a detailed training section with examples of progressive difficulty to lead the reader to program the VFM. This is accompanied with a set of commented Matlab programs as well as with a GUI Matlab based software for more general situations.

Download or read book Rock Deformation from Field Experiments and Theory written by D.R. Faulkner and published by Geological Society of London. This book was released on 2015-10-26 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ernie Rutter has made, and continues to make, a significant impact in the field of rock deformation. He has studied brittle and plastic deformation processes that occur within both the oceanic and continental crust, as well as other key properties such as the permeability and seismic velocities of these rocks. His approach has been one that integrates field observations, laboratory experiments and theoretical analyses. This volume celebrates Ernie's key contribution to rock deformation and structural geology by bringing together a collection of papers that represent this broad approach. The papers within the volume address key issues that remain within these fields. These range from fundamental studies of brittle and plastic behaviour along with the resultant structures and microstructures from both the field and laboratory, to applied problems where a better understanding of the deformation and properties of the crust is still needed.

Download or read book Principles of Rock Deformation written by A. Nicolas and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physicists attempt to reduce natural phenomena to their essential dimensions by means of simplification and approximation and to account for them by defining natural laws. Paradoxically, whilst there is a critical need in geology to reduce the overwhelming field information to its essentials, it often re mains in an over-descriptive state. This prudent attitude of geologists is dictated by the nature of the subjects being consi dered, as it is often difficult to derive the significant parame ters from the raw data. It also follows from the way that geolo gical work is carried out. Geologists proceed, as in a police investigation, by trying to reconstruct past conditions and events from an analysis of the features preserved in rocks. In physics all knowledge is based on experiment but in the Earth Sciences experimental evidence is of very limited scope and is difficult to interpret. The geologist's cautious approach in accepting evidence gained by modelling and quantification is sometimes questionable when it is taken too far. It shuts out potentially fruitful lines of advance; for instance when refu sing order of magnitude calculations, it risks being drowned in anthropomorphic speculation. Happily nowadays, many more studies tend to separate and order the significant facts and are carried out with numerical constraints, which although they are approxi mate in nature, limit the range of hypotheses and thus give rise to new models.

Download or read book Thermo mechanical Fatigue Behavior of Materials written by Huseyin Sehitoglu and published by ASTM International. This book was released on 2000 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quantification and Modelling of Heterogeneous Systems written by Ivan Saxl and published by . This book was released on 1995 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Uncertainty Quantification in Multiscale Materials Modeling written by Yan Wang and published by Woodhead Publishing Limited. This book was released on 2020-03-12 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uncertainty Quantification in Multiscale Materials Modeling provides a complete overview of uncertainty quantification (UQ) in computational materials science. It provides practical tools and methods along with examples of their application to problems in materials modeling. UQ methods are applied to various multiscale models ranging from the nanoscale to macroscale. This book presents a thorough synthesis of the state-of-the-art in UQ methods for materials modeling, including Bayesian inference, surrogate modeling, random fields, interval analysis, and sensitivity analysis, providing insight into the unique characteristics of models framed at each scale, as well as common issues in modeling across scales.

Download or read book Modeling and Quantification of Anisotropy and Heterogeneity in Geomaterials written by Shabnam J. Semnani and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Geomaterials such as soils and rocks are inherently anisotropic, heterogeneous, sensitive to changes in temperature, and prone to strain localization, a common manifestation of material instability that has been linked traditionally to failure of materials. Accurate prediction of strength in geomaterials with distinct bedding planes requires knowledge of the bedding plane orientation relative to that of the load. In addition, thermal softening is known to have significant influence on the strength and strain localization properties of geomaterials. In this work, a thermoplastic framework is developed for modeling the coupled thermo-mechanical response and predicting the inception of shear band in transversely isotropic materials using the general framework of critical state plasticity. The formulation incorporates anisotropy in both elastic and plastic responses under the assumption of infinitesimal deformation. The model is first calibrated using experimental data from triaxial tests to demonstrate its capability in capturing anisotropy in the mechanical response. Simulations of strain localization are carried out under two different conditions, namely, isothermal localization and adiabatic localization. The adiabatic formulation investigates the effect of temperature on localization via thermo-mechanical coupling. Numerical simulations are presented to demonstrate the important role of anisotropy, hardening, and thermal softening on strain localization inception and orientation. Subsequently, simulations of the strength of two rocks, namely, Tournemire shale and a simulated transversely isotropic rock, suggest that the mechanical model can reproduce the general U-shaped variation of rock strength with bedding plane orientation quite well. It is shown that strength and shear band formation depend on many factors, including the stress loading condition, anisotropy parameters, and thermal effects. Geomaterials are also highly heterogeneous and consist of various phases that form complex structures persisting at multiple scales. Another portion of this work focuses on multi-scale quantification of heterogeneity in nanoporous geomaterials using high-resolution imaging techniques. For this purpose, Transmission X-ray microscopy and X-ray micro-tomography were used to image samples of Woodford shale, a nanoporous rock, at the length scales ranging from nano-meters to millimeters. While high-resolution imaging is crucial for characterizing the microstructure of this rock, it is generally not feasible to image a large sample at a high resolution over a large field of view (FOV), thus limiting characterization of the microstructure of this material. In this work, a stochastic framework is developed based on multiple-point statistics that uses high-resolution training images to enhance low-resolution images obtained over a large FOV. Comparison of the simulation results with true high-resolution images shows that the method can offer a solution to the trade-off between imaging resolution and FOV associated with imaging of heterogeneous materials. The described multi-scale imaging approach has vast applications to computational modeling such as computational homogenization, mesh sensitivity studies and multi-scale modeling methods.

Download or read book Quantification of Deformation Fabrics in Various Rocks Using Magnetic Anisotropy written by Bernard Arthur Housen and published by . This book was released on 1994 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Springer Handbook of Experimental Solid Mechanics written by William N. Sharpe, Jr. and published by Springer Science & Business Media. This book was released on 2008-12-04 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Handbook of Experimental Solid Mechanics documents both the traditional techniques as well as the new methods for experimental studies of materials, components, and structures. The emergence of new materials and new disciplines, together with the escalating use of on- and off-line computers for rapid data processing and the combined use of experimental and numerical techniques have greatly expanded the capabilities of experimental mechanics. New exciting topics are included on biological materials, MEMS and NEMS, nanoindentation, digital photomechanics, photoacoustic characterization, and atomic force microscopy in experimental solid mechanics. Presenting complete instructions to various areas of experimental solid mechanics, guidance to detailed expositions in important references, and a description of state-of-the-art applications in important technical areas, this thoroughly revised and updated edition is an excellent reference to a widespread academic, industrial, and professional engineering audience.

Download or read book Medical Image Computing and Computer Assisted Intervention MICCAI 2017 written by Maxime Descoteaux and published by Springer. This book was released on 2017-09-03 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three-volume set LNCS 10433, 10434, and 10435 constitutes the refereed proceedings of the 20th International Conference on Medical Image Computing and Computer-Assisted Intervention, MICCAI 2017, held inQuebec City, Canada, in September 2017. The 255 revised full papers presented were carefully reviewed and selected from 800 submissions in a two-phase review process. The papers have been organized in the following topical sections: Part I: atlas and surface-based techniques; shape and patch-based techniques; registration techniques, functional imaging, connectivity, and brain parcellation; diffusion magnetic resonance imaging (dMRI) and tensor/fiber processing; and image segmentation and modelling. Part II: optical imaging; airway and vessel analysis; motion and cardiac analysis; tumor processing; planning and simulation for medical interventions; interventional imaging and navigation; and medical image computing. Part III: feature extraction and classification techniques; and machine learning in medical image computing.

Download or read book Model Validation and Uncertainty Quantification Volume 3 written by Robert Barthorpe and published by Springer. This book was released on 2019-05-30 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model Validation and Uncertainty Quantification, Volume 3: Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics, 2019, the third volume of eight from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Model Validation and Uncertainty Quantification, including papers on: Inverse Problems and Uncertainty Quantification Controlling Uncertainty Validation of Models for Operating Environments Model Validation & Uncertainty Quantification: Decision Making Uncertainty Quantification in Structural Dynamics Uncertainty in Early Stage Design Computational and Uncertainty Quantification Tools

Download or read book Multiscale Modeling and Uncertainty Quantification of Materials and Structures written by Manolis Papadrakakis and published by Springer. This book was released on 2014-07-02 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the IUTAM Symposium on Multiscale Modeling and Uncertainty Quantification of Materials and Structures that was held at Santorini, Greece, September 9 – 11, 2013. It consists of 20 chapters which are divided in five thematic topics: Damage and fracture, homogenization, inverse problems–identification, multiscale stochastic mechanics and stochastic dynamics. Over the last few years, the intense research activity at micro scale and nano scale reflected the need to account for disparate levels of uncertainty from various sources and across scales. As even over-refined deterministic approaches are not able to account for this issue, an efficient blending of stochastic and multiscale methodologies is required to provide a rational framework for the analysis and design of materials and structures. The purpose of this IUTAM Symposium was to promote achievements in uncertainty quantification combined with multiscale modeling and to encourage research and development in this growing field with the aim of improving the safety and reliability of engineered materials and structures. Special emphasis was placed on multiscale material modeling and simulation as well as on the multiscale analysis and uncertainty quantification of fracture mechanics of heterogeneous media. The homogenization of two-phase random media was also thoroughly examined in several presentations. Various topics of multiscale stochastic mechanics, such as identification of material models, scale coupling, modeling of random microstructures, analysis of CNT-reinforced composites and stochastic finite elements, have been analyzed and discussed. A large number of papers were finally devoted to innovative methods in stochastic dynamics.

Download or read book High Temperature Deformation Mechanisms and Strain Heterogeneities in Calcite Rocks written by Lili Xu (Sh. D.) and published by . This book was released on 2008 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: In nature, carbonates often accumulate large amounts of strain in localized shear zones. Such marble sequences play a key role in crustal deformation processes. Despite extensive field and laboratory investigation, many questions remain concerning the mechanical behavior of these rocks. For example, the mechanical behavior of different limestones and marbles differ greatly, possibly owing to the presence of chemical impurities or solid-solutes. Thus, Chapter 2 examines the effect of Mg solute, a common impurity, on the mechanical behavior of calcite rocks. The results indicate that increasing Mg content increases the strength of calcite rocks during dislocation creep. The anisotropic nature of crystal slip usually entails variations in reorientation of individual grains and heterogeneous deformation within the polycrystalline material. In Chapter 3, a new technique including a series of sample preparation and image analysis algorithms is developed to provide quantitative measurements of the scale of heterogeneities produced, and to gain fundamental insight into polycrystalline plasticity. We place particular attention on quantifying variations of strain within grain interiors and at grain boundaries, and on recognizing the relative activities of different slip systems. The quantification of grain-to-grain interactions during straining is relevant for the improvement and verification of models of polycrystalline plasticity. The strain measurements obtained from Chapter 3 are compared with predictions of grain strain and reorientation obtained from the self-consistent viscoplastic method (Chapter 4). The results suggest that the self-consistent model gives a good description of global texture, but does not always predict lattice rotation and deformation within individual grains. To predict the actual deformation of individual grains will require a quantitative consideration of the effects on local strain of grain-boundary misorientation, local strain/stress state, grain-boundary sliding, and deviations in grain geometry.