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 160 for “"Structures and Materials"”.
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Foldable Structures and Materials
… folded hinges can become rigid—capable of withstanding structural loads. Depending on the organization of folds, structures can be flat-packed for ease of transport. Folding can also provide the potential to reduce production costs associated with the complexity of manufacturing parts which have …
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Surface wave techniques for the study of engineering structures and materials
… amplitude transient of high order modes of disks and for the case where there are two adjacent resonant frequencies. The techniques developed have been applied to the measurenent of the elasticities of refractory materials at high temperatures. In the experimental study of the high order in-plane …
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Origami-inspired structures and materials: analysis and metamaterial properties and seismic design of hybrid masonry structural systems
This Dissertation was approved for publication on 2015-12-04 at 08:01.
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Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels Under Edgewise Compressive Loading
… due to the lightweight properties of composite materials. Some benefits of composites include higher strength-to-weight ratio and corrosion resistance. At this point in time, the composite industry researchers are focusing on renewable and sustainable materials (bio-composites). By understanding …
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Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading
… <p>Salt water environments are very harsh on materials that are used within them. Many issues are caused by either corrosion and/or internal degradation to the materials themselves. Composites are better suited for this environment due to their high strength to weight ratios and their …
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Anticipating Detroit : a collection of instruments as a catalyst for recovery
The social, political and economic history of Detroit has been inextricably linked to the development of its most dominant industry: automotive manufacturing. This thesis suggests a strategy to overcome the disadvantages of this industrial legacy, drawing from the city's viable contemporary social …
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Developing Magnetic Tweezers for Magnetic Material Manipulation
… that are capable of manipulating very small structures and materials. Among current available methods, the magnetic tweezers show high efficiency and cost effectiveness in generating strong and direction adjustable interactions with magnetic materials. Since our research group has extensive …
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ELEMENTAL
… as well as the complex relationships of man and nature. The visual depictions of work show both a celebration of and reverence to natural objects. This is illustrated by collecting specimens from nature that are integrated into wearable objects in an amulet form. The objects created allow a …
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Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites
… that affects spacecraft surfaces by oxidizing and eroding material over time, particularly polymers. Carbon fiber/epoxy composites are a commonly used spacecraft material affected by AO exposure. Carbon composites are used as a structural material, such as on solar panels; their large surface …
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Alamo Center: A mixed - use facility
… involve the renovation of so.me of the existing structures, demolition of others, design of new linking structures, and the use of plazas and landscaping throughout the site in such a way that conflict will be minimal to the community and proper respect will be shown to the historical landmarks …
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Procedural authoring of solid models
… investigates the creation, representation, and manipulation of volumetric geometry suitable for computer graphics applications. In order to capture and reproduce the appearance and behavior of many objects, it is necessary to model the internal structures and materials, and how they change …
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Deep Deck and Cellular Deck Diaphragm Strength and Stiffness Evaluation
… cantilever diaphragm tests were performed in the Structures and Materials Laboratory at Virginia Tech. The tests included both deep deck and cellular deck profiles with varying structural and side-lap connections. The tests were conducted with three different structural connections: screws, pins …
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Spectral domain interferometry: A high-sensitivity, high-speed approach to quantitative phase imaging
Many biological specimens are transparent and in weak intensity contrast, making it invisible using conventional bright field microscopes. Therefore, the phase-based optical microscopy techniques play important roles in the development of the modern biomedical science. Furthermore, the ability to …
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Evaluation of the In-Servic Performance of the Tom's Creek Bridge
… allowance, transverse wheel load distribution and deflections under service loading, the Tom's Creek Bridge will aid in modifying current AASHTO bridge design standards for use with FRP composite materials. Second, by evaluating the FRP girders after being exposed to service conditions, the …
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Experimental Snap Loading of Synthetic Fiber Ropes
… taut state. This transfer is called a snap load and can be very violent. It is proposed to use synthetic fiber ropes as a type of passive control device in new or existing structures to mitigate seismic response. Experimental static and snap load (dynamic) tests were conducted on various …
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Engineering Anisotropic Porosity in Green Parts from Binder Jet 3D Printing
… complex geometries without the need for support structures. However, the inherent porosity in green parts, remains a challenge in achieving desired mechanical properties and performance. Instead of treating porosity as a limitation, this thesis explores engineering of anisotropic porosity …
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An Experimental Investigation of GLARE and Restructured Fiber Metal Laminates
<p>Fiber Metal Laminates (FMLs) are a group of materials fabricated by bonding glass/epoxy layers within metal layers. This class of materials can provide good mechanical properties, as well as weight savings. An FML known as Glass Laminate Aluminum Reinforced Epoxy (GLARE) was studied. An …
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Topology Optimization and Analysis of Thermal and Mechanical Metamaterials
… synthesize high-strength spatially periodic metamaterials possessing unique thermoelastic properties. A thermal and mechanical stress analysis formulation based on homogenization theory is developed and is used in a regional scaled aggregation stress constraint method, and a method of worst-case …
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An Investigation of Damage Arrestment Devices Application with Fastener/Hole Interaction
… interacts with a fastener in a composite sandwich panel. The primary objective of the damage arrestment device was to prevent the failure of the composite face sheet, such as crack propagation, around the hole/fastener joint. The damage arrestment devices are made of composite strips that …
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Design of broad-band dual-polarized microstrip patch antennas with high port isolation for millimeter-wave 5G applications
In this thesis, multiple broadband dual linearly polarized antennas are designed covering the frequency band for the next generation of 5G communications around 28 GHz. Dual polarization antennas are employed to increase the capacity of the allocated spectrum through frequency reuse. Techniques for …
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