A Combined Computational and Experimental Study of Heterogeneous Fracture
21 Sep 2015 | Contributor(s):: Wang, Neng
Advisors: Shuman Xia, Min Zhou, Ting ZhuMaterial property heterogeneity is present ubiquitously in various natural and man-made materials, such as bones, seashells, rocks, concrete, composites, and functionally graded materials. A fundamental understanding of the structure-property relationships...
A Multi-Level Upscaling and Validation Framework for Uncertainty Quantification in Additively Manufactured Lattice Structures
11 Jan 2017 | Contributor(s):: Gorguluarslan, Recep Muhammet
Advisors: Seung-Kyum Choi, David W. Rosen, David L. McDowell, Christopher J. Saldana, Rafi L. MuhannaMultiscale modeling techniques are playing an ever increasing role in the effective design of complex engineering systems including aircraft, automobiles, etc. Lightweight cellular lattice...
Additive Manufacture of Tissue Engineering Scaffolds for Bone and Cartilage
07 Jan 2016 | Contributor(s):: Eshraghi, Shaun
Advisors: Suman Das, Kyriaki Kalaitzidou, David N. Ku, Wilbur Lam, Jeannette YenBone and cartilage constructs are often plagued with mechanical failure, poor nutrient transport, poor tissue ingrowth, and necrosis of embedded cells. However, advances in computer aided design (CAD) and...
Advanced Powder Bed Fusion-Based Additive Manufacturing With Turbine Engine Hot-Section Alloys Through Scanning Laser Epitaxy
22 Jan 2018 | Contributor(s):: Basak, Amrita
Advisors: Suman Das, Kyriaki Kalaitzidou, David McDowell, Richard Neu, Hamid GarmestaniNickel-base superalloys are extensively used in the fabrication of gas turbine hot-section components as this class of alloys offers higher yield strength with increase in operating temperature due to the...
Bead Geometry, Microstructure and Texture in Multi-Axis Directed Energy Deposition
15 Sep 2021 | Contributor(s):: Elsayed, Omar Hesham
Advisors: Christopher Saldana, Thomas Kurfess, Katherine FuThe purpose of this study is to examine the effect of varying laser incidence angles on textural, microstructural and geometric characteristics of DED-processed materials, provide a more comprehensive outlook on participating laser-matter...
Digital Data Processing and Computational Design for Large Area Maskless Photopolymerization
12 Jan 2015 | Contributor(s):: Rudraraju, Anirudh V.
Advisors: Suman Das, David Rosen, Yan Wang, John Halloran, Massimo Ruzzene, Suresh K. SitaramanLarge Area Maskless Photopolymerization (LAMP) is a novel additive manufacturing technology currently being developed at Georgia Tech in collaboration with the University of Michigan at Ann Arbor and...
Effects of Spatial Energy Distribution-Induced Porosity on Mechanical Properties of Laser Powder Bed Fusion 316L Stainless Steel
20 May 2020 | Contributor(s):: Jost, Elliott
Advisors: Christopher Saldana, Kate Fu, Tom Kurfess, David MooreLaser powder bed fusion (LPBF) additive manufacturing (AM) offers a variety of advantages over traditional manufacturing, but the usefulness of AM for manufacturing of high-performance components is currently hampered by internal...
High Cycle Fatigue of Additively Manufactured Inconel 625
11 Jan 2021 | Contributor(s):: Espejo Abela, Alvaro Espejo
Advisors: Richard W. Neu, Antonia Antoniou, Aaron StebnerThis research aims to investigate the influence of the microstructure, defect features, and surface roughness on the high cycle fatigue (HCF) strength of IN625 manufactured using L-PBF (Laser Powder Based Fusion) additive manufacturing (AM)...
High Throughput Assays for Exploring Materials Space for Additive Manufacturing
20 May 2020 | Contributor(s):: Gong, Xinyi
Advisors: Surya R. Kalidindi, David McDowell, Preet Singh, Hamid Garmestani, Richard W. NeuRecent advances in additive manufacturing (AM) offer exciting opportunities to build materials with novel internal structures combined with intricate part geometries that cannot be achieved by traditional...
Integrated Multi-Media Platform for Hybrid 3D Printing
17 Aug 2017 | Contributor(s):: Dunn, Conner
Advisors: H. Jerry Qi, Suman Das, Shuman XiaThe advent of Additive Manufacturing, also commonly referred to as 3D Printing, has enabled the rapid production of parts consisting of complex geometries that are extremely labor-intensive or even unrealizable with the use of traditional manufacturing...
Investigation of Process-Structure Relationship for Additive Manufacturing With Multiphysics Simulation and Physics-Constrained Machine Learning
15 Sep 2021 | Contributor(s):: Liu, Dehao
Advisors: Yan Wang, David L. McDowell, Shreyes N. Melkote, Tuo Zhao, Sudarsanam Suresh BabuMetal additive manufacturing (AM) is a group of processes by which metal parts are built layer by layer from powder or wire feedstock with high-energy laser or electron beams. The most well-known metal AM...
Methodology for Efficiently Establishing Processing-Structure-Property Relationships for Additive-Manufactured Age-Hardened Alloys
27 Aug 2018 | Contributor(s):: Seitz, Benjamin
Advisors: Richard W. Neu, David L. McDowell, Siegfried Schmauder, Oliver SawodnyIn Additive Manufacturing (AM) of Inconel 718 the main focus lies on the primary solidification occurring in the build. The next critical processing step for age-hardened alloys is the post-built heat treatment. Since...
Multiphysics Modeling and Statistical Process Optimization of the Scanning Laser Epitaxy Process Applied to Additive Manufacturing of Turbine Engine Hot-Section Superalloy Components
07 Jan 2016 | Contributor(s):: Acharya, Ranadip
Advisors: Suman Das, Yogendra Joshi, Arun Gokhale, Jianjun Shi, Surya KalidindiScanning Laser Epitaxy (SLE) is a new laser-based layer-by-layer generative manufacturing technology being developed in the Direct Digital Manufacturing Laboratory at Georgia Tech. SLE allows creation of geometrically...
Nonlinear Ultrasonic Technique for the Characterization of Microstructure in Additive Materials
15 Sep 2021 | Contributor(s):: Bellotti, Aurelio Angelo
Advisors: Laurence J Jacobs, Jin-Yeon Kim, Christopher SaldanaThis thesis employs nonlinear ultrasonic techniques to track microstructural changes in additively manufactured (AM) metals. Adoption of AM in critical scenarios has been slowed by uncertainty stemming from variations in the resultant...
Physics Based Compressive Sensing for Additive Manufacturing Process Monitoring
11 Jan 2021 | Contributor(s):: Lu, Yanglong
Advisors: Yan Wang, Alexander Alexeev, Steven Liang, Devesh Ranjan, Christopher Saldana, Mark DavenportSensors play an important role in smart manufacturing. Different types of sensors have been used in process monitoring to ensure the quality of products. As a result, the life-cycle cost of...
Precision 3-D Metal Microstructure Array Fabrication With Direct-Write Electrodeposition
31 May 2018 | Contributor(s):: Lin, Yen-Po
Advisors: Min Zhou, Min-Feng Yu, Ting Zhu, Jerry Qi, Meilin Liu, Julian RimoliOne of the major challenges in 3-D manufacturing is to develop a parallel manufacturing process for fabricating precision metal microstructures. Its realization promises the development of high aspect-ratio metal...
Qualification of Laser Powder Bed Fusion Processed 17-4 PH Stainless Steel as a Function of Powder Condition
08 Sep 2020 | Contributor(s):: Berez, Jaime Michael Schnaier
Advisors: Christopher Saldana, Thomas Kurfess, Katherine Fu, Ramesh RamakrishnanThe metal additive manufacturing process of laser powder-bed fusion (LPBF) presents a challenge to develop qualified processes to match the rapid pace of technology development. An aspect of the LPBF process where...
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...
Rapid Digitization and Non-Rigid Registration of Aerospace Blade Geometries for Hybrid Manufacturing Component Repair
29 May 2019 | Contributor(s):: Kim, Myong Joon
Advisors: Christopher J Saldana, Thomas Kurfess, Shreyes N MelkoteUsing hybrid manufacturing strategies provides an opportunity to automate the entire process of repairing airfoil components, which involves processes that include preparing for pre-weld airfoil, wire-feed welding, on-machine...
Scan Strategy Interpolation for Laser Powder Bed Fusion in Manufacturing Applications
10 Jun 2021 | Contributor(s):: Jung, Patrick V.
Advisors: Christopher Saldana, Katherine Fu, Thomas KurfessLaser Powder Bed Fusion (L-PBF) is a technique within additive manufacturing which uses a high power density laser to build parts from fused powdered metal alloy. This technology is well equipped to produce complex parts with otherwise...