Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"process structure property"”.
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Advancing Vat Photopolymerization of Photosensitive Polyimides: Process-Structure-Property Relationships
… properties also make them challenging to process. For this reason, they are typically only found in films, tapes, rods, and plaques. Combining the geometric freedom of VPP with the material properties of aromatic polyimides would open a wide array of new applications. Existing efforts to …
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Process-Structure-Property Relationships of Cellulose Derivative/Thermoplastic Urethane Polymer Composites
… robotics, flexible electronics, and adaptive structures. However, the widespread adoption of such systems remains limited by processing challenges, particularly the difficulty of incorporating cellulose derivatives into thermoplastic matrices without compromising dispersion and thermal …
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Metal Additive Manufacturing Process-Structure-Property Relational Linkages Using Gaussian Process Surrogates
Process-structure-property (PSP) relational linkages are necessary for designing, developing, and tailoring a material to exhibit desired properties, and ultimately, performance for a targeted application. Establishing PSP linkages typically involves building and testing materials from a given …
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Data-driven Process-Structure-Property Models for Additive Manufactured Ni-base Superalloys
… complexity of the selective laser melting (SLM) process, which has shown success for shaping advanced structural alloys, has concentrated most of the research efforts to develop process-structure-property (PSP) models for fostering our understanding of the process that can ultimately serve as …
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Process-Structure-Property Relationship Study of Selective Laser Melting using Molecular Dynamics
… and high-precision end-use products. The SLM processing parameters highly influence the part quality, microstructure, and mechanical properties. The process-structure-property relationship of the SLM process is not well-understood. In the process-structure study, a quasi-2D model of …
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Process/Structure/Property Relationships of Semi-Crystalline Polymers in Material Extrusion Additive Manufacturing
… ratio and robustness. Being an extrusion process in its essence, this process enables the free form fabrication of a wide range of thermoplastic materials. However, in most typical MEX processes, only amorphous polymers are being used as feedstock material owing to their smaller …
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Evaluation of process-structure-property relationships of carbon nanotube forests using simulation and deep learning
This work is aimed to explore process-structure-property relationships of carbon nanotube (CNT) forests. CNTs have superior mechanical, electrical and thermal properties that make them suitable for many applications. Yet, due to lack of manufacturing control, there is a huge performance gap between …
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Investigating the Process-Structure-Property Relationships in Vat Photopolymerization to Enable Fabrication of Performance Polymers
… challenges in scalability stem from an inherent process paradox: the feature resolution, part size, and manufacturing throughput cannot be maximized simultaneously in standard VP platforms. In addition, VP's inability to process viscous and high-molecular weight engineering polymers limits the VP …
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Establishing the process-structure-property-performance relationship and viable repair pathways for expeditionary airfield surfacing systems.
… objective of this research seeks to establish a process-structure-property-performance (PSPP) relationship of EAF surfacing systems to enable characterization and performance predictions for legacy and next-generation designs while evaluating repair pathways that can be performed onsite at the …
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Process-structure-property relationships of resorbable desamino tyrosine derived polymers : effect of backbone chemistry and assembly on drug delivery
… material by changing backbone or pendent chain structure. L-tyrosine derived polyarylate is one of the class of these materials. This study investigates the behavior of the tyrosine derived polyarylates under in vitro conditions. The change of structure caused by incubation in phosphate buffer …
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Utilizing viruses to probe the material process - structure - property relationship : controlling catalytic properties via protein engineering and nanoscale synthesis
… of a non-petrochemical based energy infrastructure, catalysts play an important role in meeting the increasing energy and consumable demands of today without compromising the global health of tomorrow. Development of these catalysts relies on the fundamental understanding of the effects …
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Data-driven PSP linkages for atomistic datasets
… models. The development of quantitative “process-structure-property” (PSP) linkages for atomistic simulations presents a powerful route to convert atomistic simulation data into actionable knowledge. Here, a framework is presented for quantifying structure from these simulations in full- …
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INVESTIGATION OF PROCESSING-STRUCTURE-PROPERTY RELATIONS IN VAPOR PHASE MODIFIED CELLULOSIC MATERIALS
… liquid phase precursor solutions, vapor phase processing uses gas molecules as precursors to realize surface coatings with better uniformity and consistency amongst batches. Atomic layer deposition (ALD) technique can be conducted at relative lower reaction temperatures (25 – 300 ℃) and realize …
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Advancing additive friction stir deposition as a repair technology through smooth particle hydrodynamic simulations.
… is a solid-state additive manufacturing (AM) process capable of generating near net shape components though layer by layer depositions. AFSD leverages frictional and plastic heat generation to plasticize material inside of a hollow, rotating tool. In addition to the manufacture of near net …
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Modeling Heat Transfer and Densification during Laser Sintering of Viscoelastic Polymers
Laser sintering (LS) is an additive manufacturing process which uses laser surface heating to induce consolidation of powdered materials. This work investigates some of the process-structure-property relationships for LS of viscoelastic polymers. A one-dimensional closed-form analytical solution …
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Analytics-Driven Cooperative Multi-Robot Additive Manufacturing: Advancing Efficiency and Quality
… that links robot kinematics and dynamics, process parameters, and cooperation strategies to the resulting process–structure–property relationships in multi-robot AM. First, it characterizes the dimensional accuracy and energy consumption of single-robot AM through analytically grounded and …
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Binder Infill Pattern Design Strategies for Increased Mechanical Properties in Binder Jet Additive Manufacturing Parts
… to give sufficient green part strength for post-processing and to preserve part geometric accuracy. However, recent research suggests that, compared to sintering powder with no binding agent, the presence of binder limits densification during sintering. Specifically, the authors have shown that …
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Binder-Powder Interaction: Investigating the Process-Property Relations in Metal Binder Jetting
… a powder bed based additive manufacturing (AM) process where the interaction of inkjetted droplets of a binder and particles in the powder bed create 3D geometries in a layerwise fashion. The fabricated green parts are usually thermally post-processed for densification and strengthening. BJT …
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Computational and Machine Learning-Reinforced Modeling and Design of Materials under Uncertainty
… aims to develop new methodologies to design microstructures under inherent material uncertainty by incorporating machine learning techniques. To achieve this objective, the study addresses gradient-based and machine learning-driven design optimization methods to enhance homogenized linear and …
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