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 22 for “"filler material"”.
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Study of an advanced helmet liner concept to reduce TBI : experiments & simulation using sandwich structures
… is being proposed that introduces solid or fluid filler material in channels inside the helmet liner. The main emphasis has been to improve the attenuation of incoming shock waves in the Army helmets; however, some impacts studies were also carried out for sports helmets. Directed blast …
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Microstructure and Mechanical Properties of WE43 Alloy Produced Via Additive Friction Stir Technology
… ratio. Further efforts to save on material use and machining time have focused on the use of additive manufacturing. However, anisotropic properties can be caused by both the HCP structure of magnesium alloys as well as by layered effects left by typical additive manufacturing …
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Passive materials for high frequency piezocomposite ultrasonic transducers
… in the manufacture of fine scale piezocomposite materials mean there is great potential for commercial transducers far superior to conventional devices currently in clinical use. This Thesis reports the fabrication and characterisation of passive materials suitable for use in high frequency …
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Curing Characteristics of Photopolymer Resin With Dispersed Glass Microspheres in Vat Polymerization 3D Printing
… quality of the 3D printed specimen. Dispersing filler material into the photopolymer resin changes its curing characteristics because the filler scatters and absorbs light, which modifies the curing reaction. However, the ability to cure photopolymer resin with high filler volume fraction is …
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Study of optical propulsion concepts and techniques for small-satellites
… optical forces. This research also explores how material selection affects the electromagnetic response of the closely positioned asymmetric nanostructures.</p> <p>Furthermore, a dielectrophoretic (DEP) nanoparticle injector concept and its use in a plasmonic/photonic-based nanoparticle …
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Development of Stochastic and Anisotropic Multiscale Ceramics Using High Aspect Ratio Sacrificial Fillers
… and hard-templating using the sacrificial filler method. Cellulose nanocrystals (CNCs) aerogels have been created via a ceramic suspension of 100g/mL of CNC powder and deionized water. Samples were then frozen, in cylindrical stainless-steel molds, using a directional ice-templating method, …
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Experimental and modeling analysis of near-field scattering from complex targets
… noted, which could be the waves supported by the filler material contained inside. This work, thus, presents a comprehensive treatment of near-field scattering from complicated targets and provides a framework to do future work on deciphering the arrival times of more complicated waves from …
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Performance properties optimization of triaxial ceramic-palm oil fuel ash by employing Taguchi design and flower pollination algorithm
The combustion of wasted palm oil materials leads to the formation of Palm Oil Fuel Ash (POFA). The lack of use of POFA for beneficial applications causes environmental problems. The introduction of new raw material in an original composition can affect original optimal parameters. The excessive …
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Design of a composite combat helmet liner for prevention of blast-induced traumatic brain injury
… is the inclusion of moveable or deformable materials sandwiched within foam to dissipate the blast energy, reduce the peak transmitted pressure, and stretch the blast waveform before it reaches the brain. Filler materials explored in this work include glass beads, aerogel, glycerin, and …
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Finite element analysis of composite tubes with integral ends subjected to bending loads
… constructed with bonded interface joints. The material properties of the cylinder plies were orthotropic in the fiber direction. The analytical models were developed to simulate two concentric laminated composite cylinders with a gap of 0.158 in between them. In the first part of the analysis, …
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3D FE simulation of the welding process to optimise residual stress profiles in complex geometries
… tee branch junction. The moving heat source and filler material deposition were simulated by assigning reactivated elements with a volumetric heat flux progressing along the weld path. Temperature dependent material properties, latent heat and large deformation were considered. Detailed …
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High elastic modulus nanopowder reinforced resin composites for dental applications
… and their mechanical properties are studied. Materials with higher elastic modulus, such as alumina and diamond, are used to replace the routine filler material, silica, in dental resin composites to achieve the desired properties. This class of composites is developed to serve (1) as a high …
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Performance and Cost Analysis of a Structured Concrete Thermocline Thermal Energy Storage System
… salt, and their applicability as structured filler material is assessed.</p>
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Welding Simulations of Aluminum Alloy Joints by Finite Element Analysis
… base metal is aluminum alloy 2519-T87 and the filler material is alloy 2319. The simulations are performed with the commercial software SYSWELD+®, which includes moving heat sources, material deposit, metallurgy of binary aluminum, temperature dependent material properties, metal plasticity and …
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Analysis of the Physiochemical Interactions of Recycled Materials in Concrete
This thesis broadly addresses the issue of materials sustainability in the production of Portland cement concrete. Two methods are presented, both aimed at achieving more sustainable concrete through the use of waste and recycled materials. The first method involves utilizing reclaimed asphalt …
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High Permeability/High Diffusivity Mixed Matrix Membranes For Gas Separations
… upper bound curves. The search for membrane materials that transcend Robeson's upper bound has been the critical issue in research focused on membranes for gas separation in the past decade. To that end, many researchers have explored the idea of mixed matrix membranes (MMMs). These membranes …
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Improving Bioactivity and the Anti-Bacterial Properties of Two-Solution Bone Cement Containing Cross-Linked Polymethylmethacrylate (PMMA) Nanospheres (η-TSBC)
… considered a major limitation to the use of this material. Modified two-solution cements containing cross-linked polymethylmethacrylate (PMMA) nanospheres (η-TSBC), as part of the polymer phase, were fabricated as the first step for optimization of cement viscosity for application of the material …
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Rehabilitation of Longitudinal Joints in Double-Tee Girder Bridges
… modified concrete (LMC) were selected as the filler materials because of their improved strength and durability. Thirteen large-scale beam tests were carried out to investigate the performance of the selected joint rehabilitation details and to select the best for large-scale testing. …
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Heat Transfer and Flow in Solar Energy and Bioenergy Systems
… transfer between Heat Transfer Fluid (HTF) and filler material in four different solid-fluid TES configurations, formulas of an effective heat transfer coefficient were theoretically developed and presented by extending the validity of Lumped Capacitance Method (LCM) to large Biot number, as well …
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Study of Hybrid Cellulose Nanocrystals in Polymeric Nanocomposites
… society's demand for biobased and sustainable materials is increasing annually. Environmental pollution related to petroleum-based plastics has motivated research into developing alternative bioplastics. These alternatives include carbohydrates such as starch, cellulose, pullulan, kefiran, and …
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