Multiaxial Testing and Analytical Constitutive Characterization of Granular Materials
Author | : John C. Mould |
Publisher | : |
Total Pages | : 638 |
Release | : 1979 |
Genre | : Granular materials |
ISBN | : |
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Author | : John C. Mould |
Publisher | : |
Total Pages | : 638 |
Release | : 1979 |
Genre | : Granular materials |
ISBN | : |
Author | : Dimitrios Kolymbas |
Publisher | : Springer Science & Business Media |
Total Pages | : 558 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 3642570186 |
In view of its extreme complexity the mathematical description of the mechanical behaviour of granular materials is an extremely difficult task. Today many different models compete with each other. However, the complexity of the models hinders their comparison, and the potential users are confused and, often, disencouraged. This book is expected to serve as a milestone in the present situation, to evaluate the present methodes, to clear up the situation, to focus and encourage for further research activities.
Author | : Bernard Cambou |
Publisher | : Springer |
Total Pages | : 403 |
Release | : 2014-05-04 |
Genre | : Technology & Engineering |
ISBN | : 370912526X |
This book presents a complete and comprehensive analysis of the behaviour of granular materials including the description of experimental results, the different ways to define the global behaviour from local phenomena at the particle scale, the various modellings which can be used for a D.E.M. analysis to solve practical problems and finally the analysis of strain localisation. The concepts developed in this book are applicable to many kinds of granular materials considered in civil, mechanical or chemical engineering.
Author | : T. Y. Chang |
Publisher | : |
Total Pages | : 76 |
Release | : 1967 |
Genre | : Granular materials |
ISBN | : |
Author | : Andrew Druckrey |
Publisher | : |
Total Pages | : 335 |
Release | : 2016 |
Genre | : Granular materials |
ISBN | : |
Constitutive modeling of granular material behavior has generally been based on global response of laboratory-size specimens or larger models with little understanding of the fundamental mechanics that drive the global response. Many studies have acknowledged the importance of micro-scale and meso-scale mechanics on the constitutive behavior of granular materials. However, much knowledge is still missing to develop and improve robust micromechanical constitutive models. The research in this dissertation contributes to this knowledge gap for many potential applications using novel experimental techniques to investigate the three-dimensional (3D) behavior of granular materials. Critical micromechanics measurements at multiple scales are investigated by combining 3D synchrotron micro-computed tomography (SMT), 3D image analysis, and finite element analysis (FEA). At the single particle level (micro-scale), particle fracture was examined at strain rates of 0.2 mm/min and 2 m/s using quasi-static unconfined compression, unconfined mini-Kolsky bar, and x-ray imaging techniques. Surface reconstructions of particles were generated and exported to Abaqus FEA software, where quasi-static and higher rate loading curves and crack propagation were simulated with good accuracy. Stress concentrations in oddly shaped particles during FEA simulations resulted in more realistic fracture stresses than theoretical models. A nonlinear multivariable statistical model was developed to predict force required to fracture individual particles with known internal structure and loading geometry. At the meso-scale, 3D SMT imaging during in-situ triaxial testing of granular materials were used to identify particle morphology, contacts, kinematics and interparticle behavior. Micro shear bands (MSB) were exposed during pre-peak stress using a new relative particle displacement concept developed in this dissertation. MSB for spherical particles (glass beads) had larger thickness (3d50 to 5d50) than that of angular sands (such as F35 Ottawa sand, MSB thickness of 1d50 to 3d50). Particle morphology also plays a significant role in the onset and growth of shear bands and global fabric evolution of granular materials. More spherical particles typically exhibit more homogeneous internal anisotropy. Fabric of particles within the shear band (at higher densities and confining pressures) exhibits a peak and decrease into steady-state. Also, experimental fabric produces more accurate strength and deformation predictions in constitutive models that incorporate fabric evolution.
Author | : Journal Editors |
Publisher | : Elsevier |
Total Pages | : 344 |
Release | : 2002-03-06 |
Genre | : Biography & Autobiography |
ISBN | : 9780080440958 |
"Geotechnical Compendium I" provides a collection of the best articles from the year 2000. The papers, selected by the Editors, are taken from the following journals: Computers and Geotechnics Geotextiles and Geomembranes International Journal of Rock Mechanics and Mining Sciences Journal of Terramechanics Soil Dynamics and Earthquake Engineering Tunnelling and Underground Space Technology
Author | : Chandrakant S. Desai |
Publisher | : Prentice Hall |
Total Pages | : 488 |
Release | : 1984 |
Genre | : Science |
ISBN | : |
Author | : Sreeramesh Kalluri |
Publisher | : ASTM International |
Total Pages | : 310 |
Release | : 1997 |
Genre | : Deformations (Mechanics) |
ISBN | : 0803120451 |
Fourteen papers from the May 1995 symposium focus on the advances that new materials testing equipment and digital computers have made possible. Representative topics: testing facilities for multiaxial loading of tubular specimens, biaxial deformation experiments over multiple string regimes, charac
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 1999 |
Genre | : |
ISBN | : |
The objective of this research is to obtain response and constitutive characterization for Concrete and mortar at strain rates up to 105/s, to analyze the evolution of load-carrying and energy absorption capacities, and to understand deformation and failure mechanisms under high pressures. The high rate failure mechanisms considered include fragmentation, comminution and granular flow. Our investigation has focused on (1) the dynamic response of the "G"-mix concrete under impact conditions; (2) the effect of composite microstructure and aggregate reinforcement on the material stress-carrying capacity; and (3) the failure wave phenomenon in mortar under uniaxial-strain impact loading. Experiments and numerical simulations have shown that while the quasistatic uniaxial strength for the concrete is approximately 30 MPa, the average compressive stresses carried by the concrete under the conditions of impact experiments involving elastic steel target plates and impact velocities between 290 - 330 /ma is on the order of 1600 MPa. The marked increase in stress is attributed to the effect of higher strain rates which are on the order of 104/s and to the effect of lateral confining stresses. Experiments also showed that the stresses carried by mortar (matrix phase in concrete) under the same conditions are approximately 1200 MPa or 75 % of that for the concrete (approximately 1600 MPa). Due to the composite microstructures and its relatively coarse aggregate size, the deformation and stresses are nonuniform inside the concrete.