Tags: microstructure

Theses and Dissertations (1-19 of 19)

  1. Microstructure Sensitive Multiscale Modeling of Fracture in Polycrystalline Metals

    10 Jun 2021 | Contributor(s):: Roy, Ushasi

    Advisors: Min Zhou, David McDowell, Ting Zhu, Antonia Antoniou, Arash YavariSystematic exploration of the correlation between macroscale properties and microstructure attributes provides decision support to design new material microstructures with tailored properties. Currently no systematic...

  2. Fundamental Understanding of NOx Sequestration Capacity and Pathways in Nano-TiO2 Engineered Cementitious Materials

    11 Jan 2021 | Contributor(s):: Jin, Qingxu

    Advisors: Kimberly E. Kurtis, Lawrence F. Kahn, Yuanzhi Tang, Emily Grubert, Jeffrey W. BullardThe ubiquity of concrete in the urban environment and the upscaling of nanomaterial production have prompted interest in the incorporation of titania (TiO2) nanoparticles into cementitious materials....

  3. Effects of Microstructure and Chemistry on the Ignition Sensitivity of PBX Under Shock Loading

    14 Jan 2020 | Contributor(s):: Miller, Christopher M.

    Advisors: Min Zhou, Richard Neu, Ting Zhu, Julian Rimoli, Cole YarringtonThe ignition sensitivity of heterogeneous energetic materials subject to shock loading is analyzed using both a Lagrangian and Eulerian computational framework. The specific focus here is on the various microstructure...

  4. Metakaolin-Portland Limestone Cements: Evaluating the Effects of Chemical Admixtures on Early and Late Age Behavior

    20 Aug 2018 | Contributor(s):: Hosseinzadeh Zaribaf, Behnaz

    Advisors: Kimberly Kurtis, Lawrence Kahn, Susan Burns, Russel Gentry, Newell Washburn, Sharad MathurOne of the most effective and applicable ways to mitigate the greenhouse gas emissions contributed by cement production is to partially replace a portion of the cement clinker with alternative...

  5. Structure-Property Linkages for Polycrystalline Materials Using Materials Knowledge Systems

    20 Aug 2018 | Contributor(s):: Paulson, Noah H.

    Advisors: Surya R. Kalidindi, David L. McDowell, Donald S. Shih, Richard W. Neu, Hamid GarmestaniComputational tools that are capable of rapidly exploring candidate microstructures and their associated properties are required to accelerate the rate of development and deployment of novel...

  6. Hydration and Microstructural Development of Portland Limestone Cement-Based Materials

    17 Aug 2017 | Contributor(s):: Nadelman, Elizabeth Imber

    Advisors: Kimberly E. Kurtis, Lawrence F. Kahn, Susan E. Burns, Carsten Sievers, T. Russell GentryThe manufacture of portland cement contributes an estimated 5-8% of all anthropogenic carbon dioxide (CO2) emissions each year. One strategy to curb these cement-induced CO2 emissions is to reduce...

  7. Construction of Representative 3D Microstructures From Complete and Partial Statistics

    11 Jan 2017 | Contributor(s):: Turner, David M

    Advisors: Surya R Kalidindi, David L McDowell, Hamid Garmestani, Le Song, Karl I JacobThe principle concern of the material scientist is the connection between microstructure, properties, and processing. Microstructure is characterized via experimental measurements of geometry at the appropriate...

  8. Characterization of Multiscale Porosity in Cement-Based Materials: Effects of Flaw Morphology on Material Response Across Size and Time Scales

    28 Jun 2016 | Contributor(s):: Mayercsik, Nathan Paul

    Advisors: Kimberly E. Kurtis, Chloe Arson, Arun M. Gokhale, Laurence J. Jacobs, Lori L. Graham-BradyIt is perhaps paradoxical that many material properties arise from the absence of material rather than the presence of it. For example, the strength, stiffness, and toughness of a concrete are...

  9. A Unified Constitutive Material Model With Application to Machining

    12 Jan 2015 | Contributor(s):: Liu, Rui

    Advisors: Shreyes N. Melkote, Steven S. Danyluk, Richard Neu, Naresh Thadhani, Roshan VengazhiyilFinite element simulation of metal cutting processes offers a cost-effective method to optimize the cutting conditions and to select the right tool material and geometry. A key input to such...

  10. Prediction of Material Fracture Toughness as Function of Microstructure

    12 Jan 2015 | Contributor(s):: Li, Yan

    Advisors: Min Zhou, David L. McDowell, Richard Neu, Ting Zhu, Shuman Xia, Donald ShihMicrostructure determines fracture toughness of materials through the activation of different fracture mechanisms. To tailor the fracture toughness through microstructure design, it is important to establish...

  11. Microstructure-Sensitive Simulation of Shock Loading in Metals

    22 May 2014 | Contributor(s):: Lloyd, Jeffrey T.

    Advisors: David L. McDowell, John D. Clayton, Min Zhou, Julian J. Rimoli, Naresh N. Thadhani, Shuman XiaA constitutive model has been developed to model the shock response of single crystal aluminum from peak pressures ranging from 2-110 GPa. This model couples a description of higher-order...

  12. Effects of Microstructure on the Spall Behavior of Aluminum-Magnesium Alloys

    22 May 2014 | Contributor(s):: Whelchel, Ricky L.

    Advisors: Naresh N. Thadhani, Thomas H. Sanders, Arun M. Gokhale, Sunil Dwivedi, Suveen Mathaudhu, Victor DangerfieldThis research focuses on the spall properties of aluminum-magnesium (Al-Mg)alloys.Aluminum alloy 5083 (Al 5083) was used as a model alloy for the work performed in this study....

  13. Stored Energy Maps in Deformed Metals Using Spherical Nanoindentation

    22 May 2014 | Contributor(s):: Vachhani, Shraddha J.

    Advisors: Surya R. Kalidindi, Richard Neu, Antonia Antoniou, Hamid Garmestani, Roger D. DohertyMicrostructure changes that occur during the deformation and heat treatments involved in wrought processing of metals are of central importance in achieving the desired properties or performance...

  14. Crystal Plasticity Finite Element Simulations Using Discrete Fourier Transforms

    22 May 2014 | Contributor(s):: Al-Harbi, Hamad F.

    Advisors: Surya R. Kalidindi, David L. McDowell, Richard W. Neu, Hamid Garmestani, Christopher L. MuhlsteinCrystallographic texture and its evolution are known to be major sources of anisotropy in polycrystalline metals. Highly simplified phenomenological models cannot usually provide reliable...

  15. Impact of Process Parameter Modification on Poly(3-Hexylthiophene) Film Morphology and Charge Transport

    13 Jan 2014 | Contributor(s):: Lee, Jiho

    Advisors: Elsa Reichmanis, Yulin Deng, Dennis W. Hess, William J. KorosOrganic electronics based on p-conjugated semi-conductor raises new technology, such as organic film transistors, e-paper, and organic photovoltaic cells that can be implemented cost-effectively on large-area applications....

  16. Modeling the Mechanical Behavior and Deformed Microstructure of Irradiated BCC Materials Using Continuum Crystal Plasticity

    13 Jan 2014 | Contributor(s):: Patra, Anirban

    Advisors: David L. McDowell, Chaitanya Deo, Hamid Garmestani, Naresh Thadhani, Ting ZhuThe mechanical behavior of structural materials used in nuclear applications is significantly degraded as a result of irradiation, typically characterized by an increase in yield stress, localization of...

  17. Analysis and Feedback Control of the Scanning Laser Epitaxy Process Applied to Nickel-Base Superalloys

    07 Apr 2013 | Contributor(s):: Bansal, Rohan

    Advisors: Suman Das, Sudarsanam Babu, Yogendra Joshi, Nader Sadegh, Jianjun ShiScanning Laser Epitaxy (SLE) is a new layer-by-layer additive manufacturing process being developed in the Direct Digital Manufacturing Laboratory at Georgia Tech. SLE allows for the fabrication of three-dimensional...

  18. Reduced Order Constitutive Modeling of a Directionally-Solidified Nickel-Base Superalloy

    28 Feb 2013 | Contributor(s):: Neal, Sean Douglas

    Advisors: Richard Neu, Stephen Antolovich, David L. McDowellHot section components of land-based gas turbines are subject to extremely harsh, high temperature environments and require the use of advanced materials. Directionally solidified Ni-base superalloys are often chosen as materials for...

  19. Quantitative Metallography Tracking and Analysis for the Scanning Laser Epitaxy Process Applied to CMSX-4 and Rene-80 Nickel-Based Superalloys

    13 Nov 2012 | Contributor(s):: Gambone, Justin J.

    Advisors: Suman Das, Arun M. Gokhale, Yan WangThis thesis involves the development of digital algorithms for the microstructural analysis of metallic deposits produced through the use of Scanning Laser Epitaxy (SLE). SLE is a new direct digital manufacturing (DDM) technique which allows for the...