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With recent breakthroughs in the observation of topological textures in polarization, several ferro- electric materials have garnered attention for hosting these exotic phases. Materials with a Bloch nature are particularly sought after for this purpose. Despite decades of research into it, only re- cently have non-trivial topological textures been observed or realized in Barium Titanate (BaTiO3). These swirling polarization textures present interesting physics and have far reaching applications, particularly with information storage. In this thesis we explore possible textures that can be realized in bulk BaTiO3 and we extend on prior studies and predict the realization of topological phases new to this prototypical ferroelectric. We then study the evolution of these phases with respect to temperature and external electric fields, to see the extent to which these textures are preserved and the associated transitions that occur from strong enough perturbations. The studies are performed using second-principles methods and a developed model potential for Barium Titanate. Notably we extend an observed lattice of vortices and anti-vortices and demostrate that the texture undergoes a topological phase transformation and conforms to a lattice of merons and antimerons in bulk BaTiO3. We then identify and further study a metastable skyrmionic phase previously unreported in Barium Titanate and explore how stable the phase is with respect to external fields. We also study the local strains in the structures to explore if it could provide prospects for experimental realization.
Polar Topologies --- Barium Titanate --- Polar skyrmions --- Merons --- Vortices --- Physique, chimie, mathématiques & sciences de la terre > Physique
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Additive manufacturing (AM) methods have grown and evolved rapidly in recent years. AM for polymers is an exciting field and has great potential in transformative and translational research in many fields, such as biomedical, aerospace, and even electronics. Current methods for polymer AM include material extrusion, material jetting, vat polymerisation, and powder bed fusion. With the promise of more applications, detailed understanding of AM—from the processability of the feedstock to the relationship between the process–structure–properties of AM parts—has become more critical. More research work is needed in material development to widen the choice of materials for polymer additive manufacturing. Modelling and simulations of the process will allow the prediction of microstructures and mechanical properties of the fabricated parts while complementing the understanding of the physical phenomena that occurs during the AM processes. In this book, state-of-the-art reviews and current research are collated, which focus on the process–structure–properties relationships in polymer additive manufacturing.
Technology: general issues --- Three Point Bending test --- mode I fracture toughness --- selective laser sintering --- polyamide and Alumide --- geometrical errors --- microstructure. --- 3D printing --- additive manufacturing --- material extrusion --- silicone --- meniscus implant --- material jetting --- polymer --- machine capability --- process capability --- statistical process control --- quality --- variability --- tolerance grade --- Fused Filament Fabrication --- thermoplastic polyurethane --- energy absorption --- dynamic compression --- crashworthiness --- Simplified Rubber Material --- Ls Dyna --- magnetic composites --- ferrite composites --- field structuring --- microstructure control --- rheological modifications --- fused filament fabrication --- polymers --- fibre reinforcement --- mechanical properties --- CFRP --- PLA mold --- fused deposition modeling --- vacuum bag technology --- 3D scanning --- bike saddle --- impact resistance --- bioinspired --- helicoidal structure --- electrospinning --- piezoelectric --- PVDF --- barium titanate --- nanocomposites --- printed electronics --- inkjet printing --- nanomaterial ink --- poly(ethylene terephthalate) --- bisphenol --- crystallization kinetics --- thermal property --- melt polycondensation --- polymer resin --- turbomachinery --- optimization --- Three Point Bending test --- mode I fracture toughness --- selective laser sintering --- polyamide and Alumide --- geometrical errors --- microstructure. --- 3D printing --- additive manufacturing --- material extrusion --- silicone --- meniscus implant --- material jetting --- polymer --- machine capability --- process capability --- statistical process control --- quality --- variability --- tolerance grade --- Fused Filament Fabrication --- thermoplastic polyurethane --- energy absorption --- dynamic compression --- crashworthiness --- Simplified Rubber Material --- Ls Dyna --- magnetic composites --- ferrite composites --- field structuring --- microstructure control --- rheological modifications --- fused filament fabrication --- polymers --- fibre reinforcement --- mechanical properties --- CFRP --- PLA mold --- fused deposition modeling --- vacuum bag technology --- 3D scanning --- bike saddle --- impact resistance --- bioinspired --- helicoidal structure --- electrospinning --- piezoelectric --- PVDF --- barium titanate --- nanocomposites --- printed electronics --- inkjet printing --- nanomaterial ink --- poly(ethylene terephthalate) --- bisphenol --- crystallization kinetics --- thermal property --- melt polycondensation --- polymer resin --- turbomachinery --- optimization
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Additive manufacturing is already actively used in various high-tech industries today. At the same time, there is a certain limitation and imperfection of known and widely used conventional materials when they are used in additive manufacturing. In this regard, extensive research and development are aimed at the advancements of new materials by adjusting the chemical compositions of conventional alloys, new equipment with expanded functionality and the ability to work with a wide range of materials that were previously not available for additive manufacturing. This Special Issue covers a wide scope of additive manufacturing processes, comprising investigation, characterization of materials and their properties, development and application of new materials, structures designed for additive manufacturing, as well as processes and techniques that will expand the potential applications of layer-by-layer synthesis.
Technology: general issues --- Chemical engineering --- additive manufacturing --- binder jetting --- silicon carbide --- spray drying --- pyrolysis --- n/a --- direct laser deposition (DLD) --- direct metal deposition --- additive manufacturing (AM) --- corrosion resistant steel --- heat treatment (HT) --- maraging steel --- microstructure --- mechanical characteristics --- selective laser melting --- titanium alloy --- mechanical alloying --- powder bed fusion --- nitinol --- direct laser deposition --- heat transfer --- mass transfer --- hydrodynamics --- simulation of the melt pool --- alloys --- Ti-6Al-4V --- direct energy deposition --- thermal history --- annealing --- phase composition --- tensile properties --- tungsten carbides --- cobalt --- nanopowder --- synthesis --- granulation --- spheroidization --- DC thermal plasma --- lead-free piezoceramic --- barium titanate --- sintering --- piezoelectric properties --- titanium alloys --- multimaterial 3D printing --- graded materials --- mechanical properties --- stress relaxation --- elevated temperatures --- pure tungsten --- selective electron beam melting (SEBM) --- porosity --- soft-magnetic alloy --- FeSiB --- magnetic properties
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Additive manufacturing (AM) methods have grown and evolved rapidly in recent years. AM for polymers is an exciting field and has great potential in transformative and translational research in many fields, such as biomedical, aerospace, and even electronics. Current methods for polymer AM include material extrusion, material jetting, vat polymerisation, and powder bed fusion. With the promise of more applications, detailed understanding of AM—from the processability of the feedstock to the relationship between the process–structure–properties of AM parts—has become more critical. More research work is needed in material development to widen the choice of materials for polymer additive manufacturing. Modelling and simulations of the process will allow the prediction of microstructures and mechanical properties of the fabricated parts while complementing the understanding of the physical phenomena that occurs during the AM processes. In this book, state-of-the-art reviews and current research are collated, which focus on the process–structure–properties relationships in polymer additive manufacturing.
Technology: general issues --- Three Point Bending test --- mode I fracture toughness --- selective laser sintering --- polyamide and Alumide --- geometrical errors --- microstructure. --- 3D printing --- additive manufacturing --- material extrusion --- silicone --- meniscus implant --- material jetting --- polymer --- machine capability --- process capability --- statistical process control --- quality --- variability --- tolerance grade --- Fused Filament Fabrication --- thermoplastic polyurethane --- energy absorption --- dynamic compression --- crashworthiness --- Simplified Rubber Material --- Ls Dyna --- magnetic composites --- ferrite composites --- field structuring --- microstructure control --- rheological modifications --- fused filament fabrication --- polymers --- fibre reinforcement --- mechanical properties --- CFRP --- PLA mold --- fused deposition modeling --- vacuum bag technology --- 3D scanning --- bike saddle --- impact resistance --- bioinspired --- helicoidal structure --- electrospinning --- piezoelectric --- PVDF --- barium titanate --- nanocomposites --- printed electronics --- inkjet printing --- nanomaterial ink --- poly(ethylene terephthalate) --- bisphenol --- crystallization kinetics --- thermal property --- melt polycondensation --- polymer resin --- turbomachinery --- optimization --- n/a
Choose an application
Additive manufacturing (AM) methods have grown and evolved rapidly in recent years. AM for polymers is an exciting field and has great potential in transformative and translational research in many fields, such as biomedical, aerospace, and even electronics. Current methods for polymer AM include material extrusion, material jetting, vat polymerisation, and powder bed fusion. With the promise of more applications, detailed understanding of AM—from the processability of the feedstock to the relationship between the process–structure–properties of AM parts—has become more critical. More research work is needed in material development to widen the choice of materials for polymer additive manufacturing. Modelling and simulations of the process will allow the prediction of microstructures and mechanical properties of the fabricated parts while complementing the understanding of the physical phenomena that occurs during the AM processes. In this book, state-of-the-art reviews and current research are collated, which focus on the process–structure–properties relationships in polymer additive manufacturing.
Three Point Bending test --- mode I fracture toughness --- selective laser sintering --- polyamide and Alumide --- geometrical errors --- microstructure. --- 3D printing --- additive manufacturing --- material extrusion --- silicone --- meniscus implant --- material jetting --- polymer --- machine capability --- process capability --- statistical process control --- quality --- variability --- tolerance grade --- Fused Filament Fabrication --- thermoplastic polyurethane --- energy absorption --- dynamic compression --- crashworthiness --- Simplified Rubber Material --- Ls Dyna --- magnetic composites --- ferrite composites --- field structuring --- microstructure control --- rheological modifications --- fused filament fabrication --- polymers --- fibre reinforcement --- mechanical properties --- CFRP --- PLA mold --- fused deposition modeling --- vacuum bag technology --- 3D scanning --- bike saddle --- impact resistance --- bioinspired --- helicoidal structure --- electrospinning --- piezoelectric --- PVDF --- barium titanate --- nanocomposites --- printed electronics --- inkjet printing --- nanomaterial ink --- poly(ethylene terephthalate) --- bisphenol --- crystallization kinetics --- thermal property --- melt polycondensation --- polymer resin --- turbomachinery --- optimization --- n/a
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