Instability of Slopes with Nonassociated Flow
Experimental investigations of the conditions for instability have shown that granular materials may become unstable inside the failure surface. For states of stress below the failure...
Densification/Creep Behavior of Experimental Glass-Ceramic Waste Forms for Immobilization of High-Level Calcined Waste at the Idaho Chemical Processing Plant
A mixture of simulated high-level calcined waste (HLW) and Frit additives was hot isostatically pressed (HIPed) to a dense glass-ceramic waste form. A densification mapping software was...
Mechanical Response of Cellular Materials Used in Waste Shipping Containers
Material behavior of impact limiters such as aluminum honeycombs and polyurethane foams has been studied experimentally. Four densities of aluminum honeycombs were tested: 3, 8, 12, and...
Direct Tensile Test: Stability and Bifurcation
Unnotched specimens of quasibrittle materials that exhibit post-peak strain softening do not deform symmetrically in a direct tension test. The phenomenon (which is similar to the recently...
Two-Dimensional Statistical Micromechanical Models for Microcracked Brittle Solids
Recent development undertaken by the authors in two-dimensional statistical micromechanical models for brittle solids with randomly located interacting microcracks is presented. Overall...
The Initiation of Bifurcations and Localization in Damaging Materials
Criteria for diffuse and discontinuous bifurcations have previously been developed and used to investigate the initiation of necking and localization in elastic-plastic materials. In this...
Softening Models for Concrete: Stability and Uniqueness
A microstructurally-based, numerically oriented, fracture-induced softening model for concrete is presented. Rate-dependent evolution equations for microcrack nucleation, growth, and coalescence...
Basic Aspects of Damage Mesomodelling
The basic aspects of a general damage computational approach which enable to simulate the complete fracture phenomenon are presented. It is a semi-discrete modelling where the material,...
Damage Mechanics Modeling of the Cyclic Behavior of Plain Concrete
The sudden stiffening behavior of concrete under cyclic loading is discussed and the available experimental investigations to delocalize damage is reviewed. A discussion on the applicability...
Three-Dimensional Thermal Jump in Stratified Cooling Channel
This study is concerned with basic properties of three-dimensional thermal jumps. Temperature measurements obtained in three-dimensional thermal jumps are presented. The jumps analyzed...
Three-Dimensional Fracture Process Zone Detection in Concrete
Process zones in concrete have been under intensive investigations during the past several years. Techniques have successfully been used to detect and map the 2-D superficial process zone....
Evaluating Polymer Concrete Bridge Expansion Joints Using Acoustic Emission
This study is to simulate the acoustic emission (A/E) of polymer concrete bridge expansion joints subjected to controlled representative loads by a rotating test apparatus on a circular...
Micromechanical Simulation of Wave Propagation in Dense Granular Assemblies
Two-dimensional DEM with modified Mindlin's contact law has been used to study the load transfer mechanisms in 'consolidated' granular assemblies. Results of simulation are presented and...
Neural Network Modeling of the Mechanical Behavior of Sand
Given a set of triaxial test data, an artificial neural network (ANN) has been trained to model the mechanical behavior of a medium-to-fine sand. Once trained, the ANN was tested by simulating...
Computer Simulation of Direct Shear Test
This paper presents a pilot study of a computer simulation of direct shear test on sands using the Discrete Element Method. The numerical test setup is described first, which is followed...
Stochastic Modeling of Fatigue Crack Growth with Retardation
This paper develops a new methodology for modeling fatigue crack growth accounting for both material inhomogeneity and the random nature of the loading process by modeling the crack growth...
Probabilistic Micromechanics in Constitutive Modeling of Granular Material
This paper gives a review of newly developed probabilistic methods for analysis of the effect of randomness in geometry and physical properties at the microscale on their macroscale response...
Joint Network Modeling and Scale Effects in Rock
Joint networks play a vital role in the mechanical and hydraulic behavior of rock masses. A realistic representation of joint geometry in rock masses and correct understanding of the mechanical...
Constitutive Modeling for Material with Perfect Disordered Heterogeneity
Finite element analysis with large number of elements are performed to simulate perfect disordered heterogenous material. The probabilistic nature of the micromechanical behavior of the...
On the Modelling of Damage Due to Volumic Variations in Cementitious Composites
Two kinds of volumic variations are considered. Those due to thermal gradients on hardened concrete and those due to hydration processes at early ages. Models based on damage mechanics...
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