Index Catalog // Arch : Northwestern University Institutional Repository

Combined In Situ Experimental and Computational Study on the Intrinsic Fracture Properties and Toughening of Two-dimensional Materials

Description:: The successful isolation of graphene marked the advent of two-dimensional (2D) materials. Their atomically thin structures enable unprecedented electrical, optical, and mechanical properties, which have triggered significant research interests in the past decade. For instance, they are promising candidates for the fabrication of flexible electronics, biological sensors, battery electrodes, and...
Keyword:: Toughening, Transmission Electron Microscopy, Molecular Dynamics Simulations, In Situ Fracture Test, Polymer, and Two-dimensional Materials
Subject:: Materials Science, Mechanical engineering, and Engineering
Creator:: Zhang, Xu
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 06/22/2022
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15978 and etdadmin_upload_889878

Numerical Simulation of Irradiation Induced Defects in Polycrystalline Solids

Description:: A framework is developed that models point defect diffusion and interaction with pre-existing microstructures during irradiation, including defect-defect interactions and defect sinks. This framework uses a modified diffusion potential that includes not only defect concentration, but also intrinsic stresses from the pre-existing microstructure. Various microstructures are studied in {Fe} by...
Keyword:: Grain boundaries, Voids, Point defects, Radiation, Crack tip, and Triple junctions
Subject:: Materials Science, Mechanical engineering, and Nuclear engineering
Creator:: Zarnas, Patrick
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 10/07/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15639 and etdadmin_upload_831637

Tribological Interface Improvement through Lubricant Additive Innovation, Surface and Material Modification

Description:: Increasingly high global energy consumption demands effective approaches to high energy efficiency and, at the same time, paths to reduced release of carbon dioxide, a primary greenhouse gas behind global climate change. Friction reduction is a vital aspect towards making energy systems more efficient and one of the most crucial...
Keyword:: wear, tribology, lubrication, and friction
Subject:: Materials Science and Mechanical engineering
Creator:: Khan, Arman Mohammad
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 06/28/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15582 and etdadmin_upload_819626

Deconvolution of Nanomechanical Atomic Force Microscopy across Interfaces in Polymer Systems in Experiment and Simulation

Description:: High performance polymers and their composites have wide ranging application in advanced and emerging material systems. The macroscale performance of these advanced materials is often defined by interfaces that induce nanoscale changes in the microstructure or molecular conformations (termed the ‘interphase’) of the polymer. Atomic force microscopy (AFM) is an...
Keyword:: Indentation, Nanoconfinement, Polymers, Atomic Force Microscopy, Nanocomposites, and Additive Manufacturing
Subject:: Nanotechnology, Materials Science, and Mechanical engineering
Creator:: Collinson, David William
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/01/2021
Date Created:: 2020-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15360 and etdadmin_upload_775260

Linear Decomposition of Atomic Orbitals: Mapping the Electronic Properties of Crystalline Materials

Description:: An extensive set of functional electronic properties depends on the electronic structure. These properties are directly connected to the reciprocal-space representation of electronic structure. However, there is a complementary, real-space perspective that is described by combinations of atomic orbitals. Atomic orbitals are the components of electronic structures, analogous to how...
Subject:: Materials Science and Mechanical engineering
Creator:: Dylla, Maxwell Thomas
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/01/2021
Date Created:: 2019-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15203 and etdadmin_upload_758137

Experiment-based Simulations for Heterogeneous Hierarchical Materials: Application to Metal Additive Manufacturing

Description:: Modeling the mechanical performance of metal produced with additive manufacturing (AM) has proven to be a challenging task. In the as-built state, these materials have been shown to exhibit strong heterogeneity and anisotropy. Even after post-processing, such as heat treatment or hot isostatic pressing and depending on the alloy, some...
Keyword:: Simulations, Additive manufacturing, Mechanical performance, and Solid mechanics
Subject:: Mechanics, Materials Science, and Mechanical engineering
Creator:: Kafka, Orion Landauer
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 04/28/2020
Date Created:: 2019-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14952 and etdadmin_upload_708678

Mechanically-Guided Deterministic Three-Dimensional Assembly for Bio-Integrated Electronics and Biomimetic Microvascular Networks

Description:: The dissertation systematically delineates the mechanically-guided deterministic assembly of three-dimensional (3D) mesostructures by compressive buckling, covering topics from mechanics concepts, design and analysis, fabrication techniques, to application opportunities. The development of approaches to form complex 3D functional mesostructures in advanced materials is a topic of broad interest, thanks to the...
Subject:: Materials Science, Mechanical engineering, and Civil engineering
Creator:: Luan, Haiwen
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2019-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14682 and etdadmin_upload_663249

Quantification of Microstructure Induced Uncertainty in Multiscale Materials with Random Processes

Description:: The heart of computational materials science lies in providing fundamental insights and understanding of materials behavior and properties across different scales. The significance of this task is highlighted by the Materials Genome Initiative and the emergence of computational tools and frameworks such as materials by design, microstructure sensitive design, and...
Keyword:: random Process, Multiscale simulation, Microstructure, Gaussian process, and Uncertainty
Subject:: Materials Science, Statistics, and Mechanical engineering
Creator:: Bostanabad, Ramin
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2019-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14508 and etdadmin_upload_638165

Multiscale Modeling of Thermoplastic Elastomers for Enhanced Mechanical Properties

Description:: To relate the mechanical responses of hard-soft copolymer systems with their microstructures, a coarse-grained molecular dynamics (CGMD) approach is employed. With the generic bead-spring polymer model mapped from atomistic simulations, this dissertation first studies the morphology of structures with various hard-soft compositions and interactions between hard beads. Following that, this...
Keyword:: coarse-grained molecular dynamics, local modulus, polyurea, micro-phase separation, interphase, and viscoelasticity
Subject:: Molecular physics, Materials Science, and Mechanical engineering
Creator:: Zhang, Min
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14464 and etdadmin_upload_626984

Laser-matter interactions in directed energy deposition

Description:: Additive manufacturing is a promising process that has the capability to build components with complex geometries for structural and biomedical applications. Due to the rapid and localized directional solidification of molten metallic alloys, unique phase transformations occur at the melt pool that can provide for components with greater strength and...
Subject:: Materials Science and Mechanical engineering
Creator:: Wolff, Sarah
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14448 and etdadmin_upload_626097

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Combined In Situ Experimental and Computational Study on the Intrinsic Fracture Properties and Toughening of Two-dimensional Materials

Numerical Simulation of Irradiation Induced Defects in Polycrystalline Solids

Tribological Interface Improvement through Lubricant Additive Innovation, Surface and Material Modification

Deconvolution of Nanomechanical Atomic Force Microscopy across Interfaces in Polymer Systems in Experiment and Simulation

Linear Decomposition of Atomic Orbitals: Mapping the Electronic Properties of Crystalline Materials

Experiment-based Simulations for Heterogeneous Hierarchical Materials: Application to Metal Additive Manufacturing

Mechanically-Guided Deterministic Three-Dimensional Assembly for Bio-Integrated Electronics and Biomimetic Microvascular Networks

Quantification of Microstructure Induced Uncertainty in Multiscale Materials with Random Processes

Multiscale Modeling of Thermoplastic Elastomers for Enhanced Mechanical Properties

Laser-matter interactions in directed energy deposition

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