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  • 1
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    Venus high temperature atmospheric dropsonde and extreme-environment seismometer (HADES) (2015)
    Elsevier
    Details
    Publication Date: 2015-06-01
    Print ISSN: 0094-5765
    Electronic ISSN: 1879-2030
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Venus High Temperature Atmospheric Dropsonde and Extreme-Environment Seismometer (HADES) (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The atmospheric composition and geologic structure of Venus have been identified by the US National Research Council's Decadal Survey for Planetary Science as priority targets for scientific exploration, however the high temperature and pressure at the surface, along with the highly corrosive chemistry of the Venus atmosphere, present significant obstacles to spacecraft design that have severely limited past and proposed landed missions. Following the methodology of the NASA Innovative Advanced Concepts (NIAC) proposal regime and the Collaborative Modeling and Parametric Assessment of Space Systems (COMPASS) design protocol, this paper presents a conceptual study and initial feasibility analysis for a Discovery-class Venus lander capable of an extended-duration mission at ambient temperature and pressure, incorporating emerging technologies within the field of high temperature electronics in combination with novel configurations of proven, high Technology Readiness Level (TRL) systems. Radioisotope Thermal Power (RTG) systems and silicon carbide (SiC) communications and data handling are examined in detail, and various high-temperature instruments are proposed, including a seismometer and an advanced photodiode imager. The study combines this technological analysis with proposals for a descent instrument package and a relay orbiter to demonstrate the viability of an integrated atmospheric and in-situ geologic exploratory mission that differs from previous proposals by greatly reducing the mass, power requirements, and cost, while achieving important scientific goals.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GRC-E-DAA-TN17841 , International Astronautical Congress 2014; Sep 29, 2014 - Oct 03, 2014; Toronto; Canada
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Structural CNT Composites (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Carbon nanotube (CNT) based materials promise advances in the production of high strength and multifunctional components for aerospace and other applications. Specifically, in tension dominated applications, the latest CNT based filaments are yielding composite properties comparable to or exceeding composites from more established fibers such as Kevlar and carbon fiber. However, for the properties of these materials to be fully realized at the component level, suitable manufacturing processes have to be developed. These materials handle differently from conventional fibers, with different wetting characteristics and behavior under load. The limited availability of bulk forms also requires that the equipment be scaled down accordingly to tailor the process development approach to material availability. Here, the development of hardware and software for filament winding of carbon nanotube based tapes and yarns is described. This hardware features precision guidance of the CNT material and control of the winding tension over a wide range in an open architecture that allows for effective process control and troubleshooting during winding. Use of the filament winder to develop CNT based Composite Overwrapped Pressure Vessels (COPVs) shall also be discussed.
    Keywords: Composite Materials
    Type: NF1676L-20693 , Annual Technical Conference of the American Society for Composites; Sep 28, 2015 - Sep 30, 2015; East Lansing, MI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Additive Manufacturing of Multifunctional Components Using High Density Carbon Nanotube Yarn Filaments (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Additive manufacturing allows for design freedom and part complexity not currently attainable using traditional manufacturing technologies. Fused Filament Fabrication (FFF), for example, can yield novel component geometries and functionalities because the method provides a high level of control over material placement and processing conditions. This is achievable by extrusion of a preprocessed filament feedstock material along a predetermined path. However if fabrication of a multifunctional part relies only on conventional filament materials, it will require a different material for each unique functionality printed into the part. Carbon nanotubes (CNTs) are an attractive material for many applications due to their high specific strength as well as good electrical and thermal conductivity. The presence of this set of properties in a single material presents an opportunity to use one material to achieve multifunctionality in an additively manufactured part. This paper describes a recently developed method for processing continuous CNT yarn filaments into three-dimensional articles, and summarizes the mechanical, electrical, and sensing performance of the components fabricated in this way.
    Keywords: Composite Materials
    Type: NF1676L-23685 , SAMPE 2016; May 23, 2016 - May 26, 2016; Long Beach, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    High Temperature Thermoplastic Additive Manufacturing Using Low-Cost, Open-Source Hardware (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Additive manufacturing (or 3D printing) via Fused Filament Fabrication (FFF), also known as Fused Deposition Modeling (FDM), is a process where material is placed in specific locations layer-by-layer to create a complete part. Printers designed for FFF build parts by extruding a thermoplastic filament from a nozzle in a predetermined path. Originally developed for commercial printers, 3D printing via FFF has become accessible to a much larger community of users since the introduction of Reprap printers. These low-cost, desktop machines are typically used to print prototype parts or novelty items. As the adoption of desktop sized 3D printers broadens, there is increased demand for these machines to produce functional parts that can withstand harsher conditions such as high temperature and mechanical loads. Materials meeting these requirements tend to possess better mechanical properties and higher glass transition temperatures (Tg), thus requiring printers with high temperature printing capability. This report outlines the problems and solutions, and includes a detailed description of the machine design, printing parameters, and processes specific to high temperature thermoplastic 3D printing.
    Keywords: Mechanical Engineering
    Type: NASA/TM-2016-219344 , L-20761 , NF1676L-25721
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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