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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Mechanical Property Characterization Of Polymeric Composites Reinforced By Continuous Microfibers, Ali Zubayar
Mechanical Property Characterization Of Polymeric Composites Reinforced By Continuous Microfibers, Ali Zubayar
Electronic Theses and Dissertations
Innumerable experimental works have been conducted to study the effect of polymerization on the potential properties of the composites. Experimental techniques are employed to understand the effects of various fibers, their volume fractions and matrix properties in polymer composites. However, these experiments require fabrication of various composites which are time consuming and cost prohibitive. Advances in computational micromechanics allow us to study the various polymer based composites by using finite element simulations. The mechanical properties of continuous fiber composite strands are directional. In traditional continuous fiber laminated composites, all fibers lie in the same plane. This provides very desirable increases …
Oscillating Heat Pipe Performance With Evaporator Section Modifications, Mitchell Hoesing
Oscillating Heat Pipe Performance With Evaporator Section Modifications, Mitchell Hoesing
Electronic Theses and Dissertations
The continuous development of electronic components to become faster and smaller has led to an increasing problem with thermal management. Thermal management ensures that the component operating temperatures are within a safe range, which maintains performance and improves reliability and lifespan. Traditional thermal management devices, such as the extruded-fin heat sink, are incapable of maintaining the safe operating temperature range for current and future high heat flux cooling applications. A device that has the capability to meet this growing need is the oscillating heat pipe. Oscillating heat pipes (OHPs) are passive, two-phase cooling devices that have been shown to transfer …
Characterization Of Mechanical Properties Of Gamma Irradiated Additively Manufactured Articles For In-Space Manufacturing, Behzad Rankouhi
Characterization Of Mechanical Properties Of Gamma Irradiated Additively Manufactured Articles For In-Space Manufacturing, Behzad Rankouhi
Electronic Theses and Dissertations
Recently, additive manufacturing (AM) has opened many doors to engineers across various industries, such as medical, bio-engineering, automotive and recently, aerospace. In an effort to contribute to the development of AM in aerospace industry, a series of experiments were designed to help understand the behavior of 3D printed parts and extend its capabilities and possible uses. The first chapter of this project will focus on understanding the mechanical behavior of additively manufactured articles. In this chapter, a comprehensive effort was undertaken to represent the strength of a 3D printed object as a function of layer thickness by investigating the correlation …
The Effects Of Diffuser Exit Velocity And Distance Between Supply And Return Apertures On The Efficiency Of An Air Distribution System In An Office Space, Khaled Abdel Razzaq Saadeddin
The Effects Of Diffuser Exit Velocity And Distance Between Supply And Return Apertures On The Efficiency Of An Air Distribution System In An Office Space, Khaled Abdel Razzaq Saadeddin
Electronic Theses and Dissertations
The distance between supply air diffusers and return air grilles is an important design parameter that has not been properly investigated. Sometimes, design and installation constraints force the engineer or the contractor to place the return duct close to the supply duct which can have a huge impact on the overall efficiency of air distribution in the zone. When the return grille is too close to the supply diffuser, air by-passes the room and flows directly back into the return duct. By-passing of the air in a zone of a building will prevent the heat transfer and the circulation that …
Fiber Orientation Prediction And Strength Evaluation Of Composite Spur Gears Reinforced By Discontinuous Fiber, Nawrin Jahan
Fiber Orientation Prediction And Strength Evaluation Of Composite Spur Gears Reinforced By Discontinuous Fiber, Nawrin Jahan
Electronic Theses and Dissertations
Composite materials have been extensively used for their important role in attenuation of components design, low specific weight, high mechanical performance, and excellent corrosion resistance offer significant advantages over metallic materials. These superlative properties can be attained by tailoring different material in an appropriate combination of the reinforcing phase (carbon fiber, alumina, etc.) and matrix phase (polymer, ceramic, metals, etc.). Carbon fiber reinforced composites are mostly used on intricate stress sensitive structures like wings of aero plane or gear. Amount of fiber, fiber type, and size of the fiber and the orientation of reinforcing fibers directly influence the mechanical properties …
The Effects Of Carbon Fiber Misalignment On Composite Material Strength, Luke Stangler
The Effects Of Carbon Fiber Misalignment On Composite Material Strength, Luke Stangler
Electronic Theses and Dissertations
Nondestructive Evaluation (NDE) is an effective way for determining material properties. More specifically, ultrasonic waves along with visual measurements from a microscope can be used to systematically determine the elastic modulus of single ply composites that are subject to an altered manufacturing process. In this approach, the magnitude of specific ultrasonic wave velocities is applied through Chirstoffel's equations to determine the necessary five elastic constants that describe the elastic modulus of transversely isotropic composites. On the other hand, fiber misalignment measurements are taken through via digital microscopy to satisfy a statistical approach for the determination of the same elastic modulus. …
Effects Of Defects On The Performance Of Hierarchical Honeycomb Metamaterials Realized Through Additive Manufacturing, Kazi Moshiur Rahman
Effects Of Defects On The Performance Of Hierarchical Honeycomb Metamaterials Realized Through Additive Manufacturing, Kazi Moshiur Rahman
Electronic Theses and Dissertations
Cellular metamaterials are of immense interest for many current engineering applications. Tailoring the structural organization of cellular structures leads to new metamaterials with superior properties providing lightweight and very strong/stiff structures. The incorporation of hierarchy to regular cellular structures enhances the properties and introduces novel tailorable metamaterials. For many complex cellular metamaterials, the only realistic manufacturing process is additive manufacturing (AM). The use of AM to manufacture large structures may lead to several types of defects during the manufacturing process, such as imperfect cell walls, irregular thickness, flawed joints, partially missing layers, and irregular elastic plastic behavior due to toolpath. …
Effect Of Poisson’S Ratio On Material Properties Characterization By Nanoindentation With A Cylindrical Flat Tip Indenter, Md Mehadi Hassan
Effect Of Poisson’S Ratio On Material Properties Characterization By Nanoindentation With A Cylindrical Flat Tip Indenter, Md Mehadi Hassan
Electronic Theses and Dissertations
Nano indentation technology is commonly used to determine the mechanical properties of different kinds of engineering materials. The young’s modulus of the materials can be calculated with the load depth data obtained from an indentation test with a known Poisson’s ratio. In this investigation the NANOVEA micro/nanoindentation tester with a cylindrical flat-tip indenter will be used to find the elastic modulus, hardness and Pile up. Low carbon steel AISI1018, alloy steel AISI 4340 and aluminum alloy 6061 were selected for the case study. Finite element (FE) analysis using axisymmetric 3-D models used to establish the relationship between Poisson’s ratio and …
Techno-Economic Feasibility Of Distributed Torrefaction Systems Using Corn Stover Feedstock, Evan Almberg
Techno-Economic Feasibility Of Distributed Torrefaction Systems Using Corn Stover Feedstock, Evan Almberg
Electronic Theses and Dissertations
This study investigated the economic feasibility of distributed torrefaction biorefining systems using corn stover feedstock to generate value-‐added products. Distributed torrefaction systems have the potential to operate on private agricultural enterprises as well as community-‐scale processing facilities, similar in scale to local grain elevators. Distributed systems will thus, reduce the need for large capital investments for dedicated commercial biorefining facilities and decrease logistical concerns for harvesting and marketing the torrefied corn stover products. In this study, a techno-‐economic model was developed to analyze the economics of harvesting techniques, logistics, processing requirements, and end product utilization. Results were determined using baseline …