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  • Metals and Metallic Materials  (8)
  • Composite Materials  (6)
  • PNAS Profiles  (4)
  • AIRCRAFT STABILITY AND CONTROL  (3)
  • 1
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    Profile of Yuval Peres [Profiles] (2018)
    National Academy of Sciences
    Details
    Publication Date: 2018-09-26
    Description: Yuval Peres received an early introduction to mathematics and probability. His mother studied physics and specialized in statistics, and his father was a sociologist who specialized in opinion polls. “At the breakfast table, we had discussions of chi-square tests and reliability of sampling, and I would be fascinated by these...
    Keywords: PNAS Profiles
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 2
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    Profile of Julian I. Schroeder [Profiles] (2018)
    National Academy of Sciences
    Details
    Publication Date: 2018-10-31
    Description: Julian Schroeder’s research career might have unfolded differently if he had not run into Linus Pauling in the coffee room. Schroeder was a graduate student at the Max Planck Institute for Biophysical Chemistry in Göttingen, Germany, and was torn between attending a seminar on plant science and a speech by...
    Keywords: PNAS Profiles
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 3
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    Profile of Steve Granick [Profiles] (2018)
    National Academy of Sciences
    Details
    Publication Date: 2018-02-14
    Description: Steve Granick says a simple underlying principle—the desire for an interesting life with meaningful human relations—has guided his career. During undergraduate study at Princeton University, Granick majored in sociology, mainly because he was interested in literature, humanities, and social sciences. He took just one obligatory science class—introductory physics—and found it...
    Keywords: PNAS Profiles
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 4
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    Profile of Scott W. Lowe [Profiles] (2018)
    National Academy of Sciences
    Details
    Publication Date: 2018-01-25
    Description: As a graduate student at the Massachusetts Institute of Technology, Scott Lowe became interested in cancer genetics. The phenomenon that drew his interest was called oncogene cooperation—the idea that it takes multiple oncogenes working together to turn a normal cell into a tumor cell. “That was an exciting concept because...
    Keywords: PNAS Profiles
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 5
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    Effects of Thermal Exposure on Properties of Al-Li Alloys (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Aluminum-Lithium (Al-Li) alloys offer significant performance benefits for aerospace structural applications due to their higher specific properties compared with conventional Al alloys. For example, the application of Al-Li alloy 2195 to the space shuffle external cryogenic fuel tank resulted in weight savings of over 7,000 lb, enabling successful deployment of International Space Station components. The composition and heat treatment of 2195 were optimized specifically for strength-toughness considerations for an expendable cryogenic tank. Time-dependent properties related to reliability, such as thermal stability, fatigue, and corrosion, will be of significant interest when materials are evaluated for a reusable cryotank structure. Literature surveys have indicated that there is limited thermal exposure data on Al-Li alloys. The effort reported here was designed to establish the effects of thermal exposure on the mechanical properties and microstructure of Al-Li alloys C458, L277, and 2195 in plate gages. Tensile, fracture toughness, and corrosion resistance were evaluated for both parent metal and friction stir welds (FSW) after exposure to temperatures as high as 300 F for up to 1000 hrs. Microstructural changes were evaluated with thermal exposure in order to correlate with the observed data trends. The ambient temperature parent metal data showed an increase in strength and reduction in elongation after exposure at lower temperatures. Strength reached a peak with intermediate temperature exposure followed by a decrease at highest exposure temperature. Friction stir welds of all alloys showed a drop in elongation with increased length of exposure. Understanding the effect of thermal exposure on the properties and microstructure of Al-Li alloys must be considered in defining service limiting temperatures and exposure times for a reusable cryotank structure.
    Keywords: Metals and Metallic Materials
    Type: AMPET; Sep 16, 2002 - Sep 18, 2002; Huntsville, AL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Metal Matrix Composite LOX Turbopump Housing Via Novel Tool-less Net-Shape Pressure Infiltration Casting Technology (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Metal matrix composites (MMC) offer relatively higher specific strength, specific stiffness, lower coefficient of thermal expansion (CTE) and lower density as compared with conventional alloys. These unique properties make them very attractive for aerospace turbomachinery applications where there is ever increasing emphasis to reduce weight and cost, and to increase engine performance. Through a joint effort between NASA and Metal Matrix Cast Composites, Inc., a complex liquid oxygen (LOX) compatible turbopump housing is being redesigned and manufactured from hybrid (particulate and fibers) Aluminum MMC. To this end, a revolutionary toolless pressure infiltration casting technology is being perfected. Ceramic preforms for the composite are 3-dimensionally printed using a stereolithography file, acquired from a CAD model. The preforms are then invested into a refractory material and pressure infiltrated with liquid metal. After casting, the refractory material is washed away leaving behind a near net-shape composite part. Benefits of this process include increased composite uniformity, no mold machining, short time from design to part, properties matching traditional methods, ability to make previously impossible to manufacture parts and no size limitations with a newly developed joining technology. The results of materials, manufacturing and design optimizations, preform joining, and sub-element tests will be presented.
    Keywords: Composite Materials
    Type: AMPET; Sep 16, 2002 - Sep 18, 2002; Huntsville, AL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Metal Matrix Composite LOX Turbopump Housing Via Novel Tool-Less Net-Shape Pressure Infiltration Casting Technology (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Metal matrix composites (MMC) offer relatively higher specific strength, specific stiffness, lower coefficient of thermal expansion (CTE) and lower density as compared with conventional alloys. These unique properties make them very attractive for aerospace turbomachinery applications where there is ever increasing emphasis to reduce weight and cost, and to increase engine performance. Through a joint effort between NASA and Metal Matrix Cast Composites, Inc., a complex liquid oxygen (LOX) compatible turbopump housing is being redesigned and manufactured from hybrid (particulate and Fibers) Aluminum MMC. To this end, a revolutionary tool-less pressure infiltration casting technology is being perfected. Ceramic preforms for the composite are 3-dimensionally printed using a stereolithography file, acquired from a CAD model. The preforms are then invested into a refractory material and pressure infiltrated with liquid metal. After casting, the refractory material is washed away leaving behind a near net-shape composite part. Benefits of this process include increased composite uniformity, no mold machining, short time from design to part properties matching traditional methods, ability to make previously impossible to manufacture parts and no size limitations with a newly developed joining technology. The results of materials, manufacturing and design optimizations, preform joining, and sub element tests will be presented.
    Keywords: Metals and Metallic Materials
    Type: TMS Joint Fall 2001 Meeting; Nov 04, 2001 - Nov 08, 2001; Indianapolis, IN; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Metal Matrix Composite LOX Turbopump Housing Via Novel Tool-Less Net-Shape Pressure Infiltration Casting Technology (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Metal matrix composites (MMC) offer relatively higher specific strength, specific stiffness, lower coefficient of thermal expansion (CTE) and lower density as compared with conventional alloys. These unique properties make them very attractive for aerospace turbomachinery applications where there is ever increasing emphasis to reduce weight and cost, and to increase engine performance. Through a joint effort between NASA and Metal Matrix Cast Composites, Inc., a complex liquid oxygen (LOX) compatible turbopump housing is being redesigned and manufactured from hybrid (particulate and fibers) Aluminum MMC. To this end, a revolutionary tool-less pressure infiltration casting technology is being perfected. Ceramic preforms for the composite are 3-dimensionally printed using a stereolithography file, acquired from a CAD model. The preforms are then invested into a refractory material and pressure infiltrated with liquid metal. After casting, the refractory material is washed away leaving behind a near net-shape composite part. Benefits of this process include increased composite uniformity, no mold machining, short time from design to part, properties matching traditional methods, ability to make previously impossible to manufacture parts and no size limitations with a newly developed joining technology. The results of materials, manufacturing and design optimizations, preform joining, and sub-element tests will be presented.
    Keywords: Composite Materials
    Type: Aeromat; Jun 11, 2001 - Jun 14, 2001; Long Beach, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Nanotechnology Concepts at MSFC: Engineering Directorate (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Nanotechnology is the art and science of building materials and devices at the ultimate level of finesse: atom by atom. Our nation's space program has needs for miniaturization of components, minimization of weight and maximization of performance, and nanotechnology will help us get there. MSFC - Engineering Directorate (ED) is committed to developing nanotechnology that will enable MSFC missions in space transportation, space science and space optics manufacturing. MSFC-ED has a dedicated group of technologists who are currently developing high pay-off nanotechnology concepts. This poster presentation will outline some of the concepts being developed at this time including, nanophase structural materials, carbon nanotube reinforced metal and polymer matrix composites, nanotube temperature sensors and aerogels. The poster will outline these concepts and discuss associated technical challenges in turning these concepts into real components and systems.
    Keywords: Composite Materials
    Type: Microgravity Materials Science Conference; Jun 06, 2000 - Jun 08, 2000; Huntsville, AL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The Application of Metal Matrix Composite Materials in Propulsion System Valves (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: Metal Matrix Composite (MMC) materials have been developed and used in many applications to reduce the weight of components where weight and deflection are the driving design requirement. MMC materials are being developed for use in some propulsion system components, such as turbo-pumps and thrust chambers. However, to date, no propulsion system valves have been developed that take advantage of the materials unique properties. The stiffness of MMC's could help keep valves light or improve life where deflection is the design constraint (such as seal and bearing locations). The low CTE of the materials might allow the designer to reduce tolerances and clearances producing better performance and lighter weight valves. Using unique manufacturing processes allow parts to be plated/coated for longer life and allow joining either by welding or threading/bolting. Additionally, casting of multi part pre-forms to form a single part can lead to designs that would be hard or impossible to manufacture with other methods. Therefore, NASA's Marshall Space Flight Center (MSFC) has developed and tested a prototype propulsion system valve that utilizes these materials to demonstrate these advantages. Through design and testing, this effort will determine the best use of these materials in valves designed to achieve the goal of a highly reliable and lightweight propulsion system. This paper is a continuation of the paper, The Application of Metal Matrix Composite Materials In Propulsion System Valves, presented at the JANNAF Conference held in April, 2002. Fabrication techniques employed, valve development, and valve test results will be discussed in this paper.
    Keywords: Composite Materials
    Type: JANNAF 52nd JP Meeting; May 10, 2004 - May 14, 2004; Las Vegas, NV; United States|1st LPG Meeting; May 10, 2004 - May 14, 2004; Las Vegas, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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