Browsing by Author "Nakshatrala, Kalyana Babu"
Now showing items 1-20 of 32
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A Scalable Variational Inequality-Based Formulation That Preserves Maximum Principles for Darcy Flow with Pressure-Dependent Viscosity
Mapakshi, Nischalkarthik (2017-08)The overarching goal of this thesis is to present a robust and scalable finite element computational framework based on Variational inequalities (VI) which models nonlinear flow through heterogeneous and anisotropic porous ... -
Application of Machine Learning in Failure Prediction of Brazed-Aluminum Based Heat Exchangers
Rahmati, Amir Hossein; 0000-0001-7246-2392 (2019-05)Brazed aluminum plate-fin heat exchangers (BAHX), extensively used by the natural gas liquid recovery and gas processing industry, are subject to a uniquely stressful and harsh environment that involves large thermal ... -
Aqueous-Based Processes for Enhanced Dissolution and Displacement/Removal of NAPLs
Saladi, Krishna Rishi Vijay; 0000-0003-1301-3663 (August 201)This dissertation addresses the aqueous-based processes associated with alcohol fuel releases and treatment of hydrocarbon impacted soils. It is comprised of two parts. In Part A, the effects of alcohols (methanol, ethanol, ... -
Atomistic Study of Fracture and Deformation Mechanisms in Nanotwinned FCC Metals
Sinha, Tanushree (August 201)Nanotwinned metals have opened up exciting avenues for the design of high-strength, high-ductility materials owing to the extraordinary properties of twin boundaries. This dissertation presents insights into the deformation ... -
Atomistic Study of Grain Boundary Sliding
Sarangi, Rutuparna 1983- (2013-05)Creep is the time-dependent mechanical plastic deformation at high temperatures (usually higher than half of the melting temperature) and stresses far below the yield stress. In both the creep deformation and damage, grain ... -
Brittle to Ductile Fracture Behavior of Isotropic Power-Law and Sigmoidal Hardening Porous Solids Using XFEM Method
Nabaa, Ali (2019-08)In order to achieve a better understanding of void growth behavior in materials, extensive experimental work was done and unit cell calculations were carried out by researchers. However, these approaches didn’t take into ... -
Characterization of a New Vegetable Oil Based Ester Drilling Fluid
Vijendra Prasad, Rashmi (August 201)This thesis presents a novel base fluid material for synthetic based drilling fluid systems. The proposed vegetable oil based ester material is biodegradable in both aerobic and anaerobic conditions as shown by the plate ... -
Characterizing and Modeling of Silicate Modified Smart Cements, Smart Cement Grouts and Drilling Muds
Ali, Md. Kausar (December 2)In this study, the effects of silicate based additives on the smart cements, smart cements grouts and drilling muds were investigated. Also the effects of clay soil contamination on the modified smart cement were investigated. ... -
Characterizing and Modeling the Dynamic Responses, Gas Leakage and Contaminations on the Behavior of the Smart Cement Composite
Amani, Niousha (December 2)Cement composites are one of the most durable construction materials, which can be used in different structures. Monitoring the behavior of the cementitious structures is critical during the construction and the entire ... -
CHARACTERIZING AND TESTING OF MODIFIED OIL WELL CEMENTS, PIPE JOINTS AND MANHOLE COATING
Ravichandran, Saravanan 1986- (2013-05)Some of the challenges in maintaining the onshore and offshore infrastructures are in monitoring the performance of cementitious materials used in construction and the performance of joints in the storm water pipelines and ... -
Characterizing the Behavior of Smart Oil Well Cement for Enhancing the Monitoring of Cement Sheath Integrity
Heidari, Mehrzad (August 201)Oil well cementing is one of the most important and yet complex steps of a drilling project. One of the challenges in maintaining the well integrity is in monitoring the performance of oil well cement (OWC) used in the ... -
Computational Methods for Multi-Scale Temporal Problems: Algorithms, Analysis, and Numerical Experiments
Karimi, Saeid; 0000-0002-5545-6406 (2016-12)A major challenge in numerical simulation of most natural phenomena is the presence of disparate temporal and spatial scales. Capturing all the fine features can be computationally prohibitive. Hence, development of efficient ... -
CONSTITUTIVE MODELING AND NUMERICAL IMPLEMENTATION OF BRITTLE AND DUCTILE MATERIAL BEHAVIOR WITH THE AID OF INELASTIC XFEM AND DAMAGE-PLASTICITY MODELS
Beizaee, Shahriyar 1985- (2013-12)Constitutive equations establish the relationship between kinetic with kinematic quantities to characterize the specific properties of the material. Mechanical constitutive relations are formulated to describe nonlinear ... -
Finite Element Analysis of FRP-to-Steel Bonded Joints with Various Non-Linear Traction Separation Laws
Berka, Vladimir M. (May 2018)This thesis presents the findings of a parametric study using a finite element analysis to investigate the influences of various traction-separation relationships on the behavior of FRP-to-steel double-lap shear coupons ... -
Interface Fracture in Masonry Composites: A Lattice Approach
Mohammadipour, Amir H.; 0000-0003-4926-9839 (2015-08)The brick-mortar bond or interface is often the weakest link in the masonry composites. The localization of fracture processes at this bi-material interface plays an important role in the failure of this assemblage. These ... -
Modeling Material Degradation Due to Moisture and Temperature
Xu, Can (2017-05)The mechanical response, serviceability, and load bearing capacity of materials and structural components can be adversely affected due to external stimuli, which include exposure to a corrosive chemical species, high ... -
Modeling the Behavior of Smart Oil Well Cements and Offshore Pipe-Soil Interaction in Very Soft Soil
Kheiri, Pooya (2014-12)It is critical to ensure the durability of the oil and gas production infrastructures from borehole to pipelines. Rheology properties and hardening characteristics are some of the important parameters for cementing slurry ... -
Modification to Darcy Model for High Pressure and High Velocity Applications and Associated Mixed Finite Element Formulations
Chang, Justin (2013-05)The Darcy model is based on a plethora of assumptions. One of the most important assumptions is that the Darcy model assumes the drag coefficient to be constant. However, there is irrefutable experimental evidence that ... -
Multi-Scale and Interface Mechanics for Porous Media: Mathematical Models and Computational Frameworks
Sarraf Joshaghani, Mohammad; 0000-0003-3932-6254 (2019-08)There are many challenges in subsurface modeling. First, many important subsurface processes occur at the interfaces, either the interface of two different porous media (e.g., layered media) or the interface of free-porous ... -
Nonlinear Finite Element Analysis with 2D Lattice Models
Isidienu, Brendan (December 2)Linear elastic models are often sufficient in the engineering design of structural and mechanical systems. Given that the yield capacity of the material is not reached or exceeded one finds a reasonable design. However, ...