Quantifying Heterogeneous Deformation
Author | : Eric Horsman |
Publisher | : |
Total Pages | : 264 |
Release | : 2006 |
Genre | : |
ISBN | : |
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Author | : Eric Horsman |
Publisher | : |
Total Pages | : 264 |
Release | : 2006 |
Genre | : |
ISBN | : |
Author | : Lieven Herbots |
Publisher | : Leuven University Press |
Total Pages | : 152 |
Release | : 2006 |
Genre | : Coronary heart disease |
ISBN | : 9789058675552 |
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2003 |
Genre | : |
ISBN | : |
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.
Author | : Chengyang Mo |
Publisher | : |
Total Pages | : 206 |
Release | : 2017 |
Genre | : Magnesium alloys |
ISBN | : |
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.
Author | : Fabrice Pierron |
Publisher | : Springer Science & Business Media |
Total Pages | : 531 |
Release | : 2012-03-21 |
Genre | : Science |
ISBN | : 1461418240 |
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.
Author | : D.R. Faulkner |
Publisher | : Geological Society of London |
Total Pages | : 277 |
Release | : 2015-10-26 |
Genre | : Science |
ISBN | : 1862396884 |
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.
Author | : A. Nicolas |
Publisher | : Springer Science & Business Media |
Total Pages | : 230 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9400937431 |
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.
Author | : Huseyin Sehitoglu |
Publisher | : ASTM International |
Total Pages | : 339 |
Release | : 2000 |
Genre | : Alloys |
ISBN | : 0803128533 |
Author | : Ivan Saxl |
Publisher | : |
Total Pages | : 126 |
Release | : 1995 |
Genre | : Science |
ISBN | : |
Author | : Yan Wang |
Publisher | : Woodhead Publishing Limited |
Total Pages | : 604 |
Release | : 2020-03-12 |
Genre | : Materials science |
ISBN | : 0081029411 |
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.