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 35 for “"lightweight materials"”.
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Impact damage behaviour of lightweight materials
… damage resistance is an essential requirement of lightweight structural components for high-performance applications. The aim of this thesis is to study the impact damage and perforation behaviour of lightweight materials including thin aluminium alloy plates and carbon fibre reinforced epoxy …
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Polyelectrolyte complexes as building blocks for gas barrier coatings and fire-safe lightweight materials
L'abstract è presente nell'allegato / the abstract is in the attachment
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Design and Manufacturing of Hierarchical Multi-Functional Materials Via High Resolution additive Manufacturing
… challenges of undesirable thermal expansion in lightweight materials. Thermal expansion of parts or components can lead to malfunction or breakdowns of complete systems in demanding environment where a large temperature gradient often exists. This work investigates a class of lightweight …
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Digital cellular solids : reconfigurable composite materials
Digital materials are comprised of a small number of types of discrete physical building blocks, which assemble to form constructions that meet the versatility and scalability of digital computation and communication systems. This work seeks to demonstrate the applicability of a digital material …
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Dynamic exoskeleton : mechanical design of a human exoskeleton to enhance maximum dynamic performance
… freedom using carbon fiber, aluminum, and other lightweight materials. The exoskeleton actuates the hip joint by comfortably providing force to three points on the body. Human testing showed a maximum increase in jump height of 13%.
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Holistic modeling and evaluation of material recovery from materially-complex end-of-life vehicles
… recovery is a key lever to promote a sustainable materials recycling system. By capturing materials from end-of-life products and substituting primary with secondary material production, society can reduce the depletion of natural resources and prevent the accumulation of valuable materials in …
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Characterization of Powder Metallurgy Lightweight Alloys
… The mechanical and dynamic properties of four lightweight materials produced by powder metallurgy and additive manufactured are tested to determine if they are suitable to be used in a structural part within an internal combustion engine. The research concluded that an additive manufactured …
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Micro-Architected Carbon Composites
Strong, stiff, and lightweight materials are highly desirable in a variety of industries, but this combination has been unavailable in traditional monolithic materials. High stiffness and low-density micro and nano scale lattices have been produced to meet this desire but are highly brittle and …
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Fracture of aluminum naval structures
… developed. The rapidly increasing application of lightweight materials, such as aluminum alloys, in the shipbuilding industry requires fundamental understanding of mechanisms and mechanics of fracture that govern naval stiffened panels. Therefore, a comprehensive tool consisting of application of …
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The mechanical testing of single nanofiber
… filtration devices, sensors, and high strength lightweight materials. Perfectly aligned PLLA Nanofibers were fabricated by an electrospinning technique under optimum conditions and the diameter of the electrospun fibers can easily be tailored by adjusting the concentration of the polymer …
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Effect of 3D Architecture on Energy Dissipation during High-speed Particle Impact
Ultralight mechanical metamaterials enabled by additive manufacturing (AM) have previously achieved density-normalized strength and stiffness properties that are inaccessible to monolithic materials, but the majority of this work has focused on static loading while the mechanical properties of …
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Fusion of remote vision and on-board acceleration data for the vibration estimation of large space structures
… The structures will need to be made of lightweight materials and will be very flexible. Autonomous robots will require information about the vibrations of the flexible structures and their dynamic parameters in order to perform the construction efficiently. Often models of the structures …
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Design and fabrication of a test apparatus for lightweight flexible space modules for assembly
… will be constructed using modules made of lightweight materials, and will be very flexible. In MIT's Field and Space Robotics Lab (FSRL), algorithms are being developed to optimize the transportation and assembly of large, flexible structures. To test these algorithms, it is necessary to …
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Development of the Weaving Machine and 3D Woven Spacer Fabric Structures for Lightweight Composites Materials
The need for innovative lightweight materials are rapidly increased in the recent years, owing to their cost-effective, high-strength, environmentally-sound use of materials and process technologies, in addition to that they reduce the weight of a product. The characteristics of 3D-spacer fabrics …
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Characterization of new particulate MMC materials and bolted joints through applicable ASTM standards
… composites (PRMMC) comprise a new class of materials whose properties can be adjusted to suit a particular application. The main purpose of producing PRMMC is to achieve lightweight materials with added properties like high stiffness, high ultimate strength and hardness.;In this study we …
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Effect of composition and sintering temperature on silica-nickel oxide foams by slurry method
It has been a long-standing effort to create materials with low density but high strength. Foam materials are very light, but compared with bulk materials, their strength is quite low because of their random structures. Natural lightweight materials such as bone, is a cellular solid with optimized …
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Improving mechanical properties of a magnesium alloy by severe plastic deformation
Magnesium alloys are very promising materials for automotive and aerospace applications due to their low density. The market of medical implants (e.g. temporary orthopaedic and cardiovascular implants) is another field of possible applications of magnesium alloys since they can completely dissolve …
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Aerogels and films through free radical polymerization
"Aerogels are porous lightweight materials, unique among all solids in terms of low density, low thermal conductivity, low dielectric constants and high acoustic attenuation. The penalty for those exceptional properties is fragility. That issue has been addressed by bridging covalently …
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A study of optimal automotive materials choice given market and regulatory uncertainty
… may foreshadow a shift in the competitiveness of lightweight alternative materials relative to incumbent steels. To test this hypothesis, a novel automotive materials selection methodology was developed which evaluates the net present value (NPV) of vehicle projects by incorporating five …
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Tensile and Compressive Mechanical Behavior of IM7/PETI-5 at Cryogenic Temperatures
… economically viable, the extensive use of lightweight materials is critical. For spacecraft with liquid fueled rocket engines, one area identified as a potential source for significant weight reduction is the replacement of traditional metallic cryogenic fuel tanks with newer designs based …
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