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...
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...
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...
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....
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...
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...
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....
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...
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...
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...
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...