Browsing School of Civil and Environmental Engineering Publications and Presentations by Title
Now showing items 94-108 of 108
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Tensile strength of calcite/HMWM and silica/HMWM interfaces: A Molecular Dynamics analysis
(Georgia Institute of Technology, 2020-03)The mechanical behavior of interfaces between high molecular weight methacrylate (HMWM) and concrete minerals (calcite and silica) is investigated from a Molecular Dynamics (MD) perspective. MD simulations of pullout tests ... -
Theoretical Bases of A Thermo-Mechanical Damage and DMT-Healing Model for Rock
(Georgia Institute of Technology, 2014-02)A theoretical framework is proposed to model thermo-mechanical (TM) crack opening, closure, and healing in rock. The model is based on Continuum Damage Mechanics and thermodynamics. The postulated free energy is a polynomial ... -
Theoretical study of damage accommodation in salt subject to viscous fatigue
(Georgia Institute of Technology, 2015-05)Underground salt cavities used for compressed air energy storage undergo cyclic loads and are subject to a fatigue phenomenon that reduces rock strength and stiffness. Understanding such behaviors and developing relevant ... -
Thermo-Hydro-Mechanical Modeling of Damage in Unsaturated Porous Media: Theoretical Framework and Numerical Study of the EDZ
(Georgia Institute of Technology, 2011-01)The damage model presented in this article (named ‘THHMD’ model) is dedicated to non-isothermal unsaturated porous media. It is formulated by means of three independent strain state variables, which are the thermodynamic ... -
A Thermo-Mechanical Damage Model for Rock Stiffness during Anisotropic Crack Opening and Closure
(Georgia Institute of Technology, 2013-11)A thermodynamic framework is proposed to couple the effect of mechanical stress and temperature on crack opening and closure in rocks. The model is based on continuum damage mechanics, with damage defined as the second-order ... -
Thermo-mechanical radial expansion of heat exchanger piles and possible effects on contact pressures at pile-soil interface
(Georgia Institute of Technology, 2014)This letter shows that the increase of heat exchanger pile capacity in response to heating, observed in several small-scale laboratory studies, cannot be directly attributed to the increase of contact pressure at the ... -
A thermodynamically consistent framework for saturated viscoplastic rock-materials subject to damage
(Georgia Institute of Technology, 2012-07)The aim of this study is to build a thermodynamically consistent theoretical framework to model viscoplasticity and damage in saturated geomaterials. The induced anisotropic damage is represented by a second-order tensor. ... -
Three Considerations for Modeling Natural Gas System Methane Emissions in Life Cycle Assessment
(Elsevier, 2019-03-13)Natural gas is a fossil fuel accounting for about 30% of US primary energy consumption. Climate change is one of the primary environmental issues associated with natural gas use: natural gas combustion releases carbon ... -
Towards a Thermodynamic Framework to Model Particle Crushing and Sieving
(Georgia Institute of Technology, 2013-06)Crushing implies the division of particles into smaller parts, and may involve a change in shape. Continuum-Based models of crushing give an average representation of elastic weakening, often in the form of a visco-plastic ... -
Transportation networks inspired by leaf venation algorithms
(2020)Biological systems have adapted to environmental constraints and limited resource availability. In the present study, we evaluate the algorithm underlying leaf venation (LV) deployment using graph theory. We compare the ... -
Using a geo-mechanical damage model to assess permeability in cracked porous media: internal length parameter issues
(Georgia Institute of Technology, 2012-01)The THHMD model is a thermo-hydro-mechanical damage model dedicated to unsaturated rocks. The present article questions one of the postulates of the model's formulation, namely using the same Representative Elementary ... -
Using Microstructure Descriptors to Model Thermo-mechanical Damage and Healing in Salt Rock
(Georgia Institute of Technology, 2014-06)Creep processes in halite (salt rock) include glide, cross-slip, diffusion and dynamic recrystallization. Diffusive Mass Transfer (DMT) can result in crack rebonding, and mechanical stiffness recovery. On the one hand, ... -
Workshop Report: "Risks and Policies of Hydraulic Fracturing: Assessment and Deliberation", Georgia Tech, November 13-14, 2014
(Georgia Institute of Technology, 2014-11)Report of the workshop: Risks and Policies of Hydraulic Fracturing: Assessment and Deliberation, held at Georgia Tech, November 2014. Report includes the following: 1. Workshop program 2. Communication: \The Fracking ... -
XFEM to couple nonlocal micromechanics damage with discrete mode I cohesive fracture
(2019-09)A computational tool is developed to simulate the propagation of a discrete fracture within a continuum damage process zone. Microcrack initiation and propagation prior to coalescence are represented by a nonlocal anisotropic ... -
θ-STOCK, a powerful tool of thermohydromechanical behaviour and damage modelling of unsaturated porous media
(Georgia Institute of Technology, 2008-09)A brief review of the basic points of a suction-based heat, moisture transfer and skeleton deformation equations for an unsaturated medium is presented. The main issues such as: two temperature-dependent state surfaces of ...