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  • 1
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    Stage-I Interstitials in Electron-Irradiated Tungsten (1969)
    American Physical Society
    Details
    Publication Date: 1969-02-15
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 2
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    High Temperature Metal and Ceramic Composites (1985)
    Springer
    Details
    Publication Date: 1985-06-01
    Print ISSN: 1047-4838
    Electronic ISSN: 1543-1851
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Polymer, metal, and ceramic matrix composites for advanced aircraft engine applications (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Advanced aircraft engine research within NASA Lewis is being focused on propulsion systems for subsonic, supersonic, and hypersonic aircraft. Each of these flight regimes requires different types of engines, but all require advanced materials to meet their goals of performance, thrust-to-weight ratio, and fuel efficiency. The high strength/weight and stiffness/weight properties of resin, metal, and ceramic matrix composites will play an increasingly key role in meeting these performance requirements. At NASA Lewis, research is ongoing to apply graphite/polyimide composites to engine components and to develop polymer matrices with higher operating temperature capabilities. Metal matrix composites, using magnesium, aluminum, titanium, and superalloy matrices, are being developed for application to static and rotating engine components, as well as for space applications, over a broad temperature range. Ceramic matrix composites are also being examined to increase the toughness and reliability of ceramics for application to high-temperature engine structures and components.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Materials for Energy Systems (ISSN 0162-9719); 8; 80-91
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Design curve for liquid helium cryostats with vapor-cooled vent tubes (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Design curve for estimating conduction heat transfer liquid He cryostats with vapor-cooled vent tubes
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; VUE SCIENTIFIQUE ET
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Observations on the deformation-induced beta internal friction peak in bcc metals (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: During a study of the effects of electron irradiation on the tungsten alpha mechanism, internal friction data were obtained. The data indicate that the mechanism underlying the beta peak does not possess the relaxation parameters generally associated with a simple dislocation process. The significance of the experimental results in the light of beta observations in other metals is discussed. It is suggested that the beta peaks in deformed bcc metals are the anelastic result of the thermally-activated relaxation of deformation-induced imperfections.
    Keywords: MATERIALS, METALLIC
    Type: Scripta Metallurgica; 8; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Fibers for structurally reliable metal and ceramic composites (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In their current state of development, commercially available reinforcing fibers fail to meet the requirements formulated for metal or ceramic matrix composites of sufficient strength and toughness. Attention is presently given to criteria for high strength and toughness in metal and ceramic matrix composites, as well as the approach adopted in fiber evaluation as a result of studies at the NASA Lewis Research Center. Two areas of special interest have been strength improvement in large diameter boron fibers for tough, impact-resistant boron/aluminum composites, and the evaluation of SiC fibers as reinforcement in tough ceramic-matrix composites with service temperatures of the order of 1400 C.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Metals (ISSN 0148-6608); 37; 44-49
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    High temperature metal and ceramic composites (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Materials Division at NASA Lewis is engaged in research and development efforts on behalf of fiber-reinforced composite materials that are lighter, stiffer, and more structurally reliable than conventional monolithic alloys and ceramics in applications that range from the cryogenic to the refractory. Attention is presently given to metal matrix composites, in which high performance depends on stiff, strong and thermally stable large diameter fibers, with chemically stable interfacial bonding and good coefficient of thermal expansion matching between fibers and matrices, and to ceramic matrix composites, in which intermediate strength interfacial bonds must allow cracks to propagate through the matrix only, while retaining good load transfer characteristics between fiber and matrix.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Metals (ISSN 0148-6608); 37; 41
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Stage-I interstitials in electron-irradiated tungsten. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Internal friction, Young modulus and resistivity measurements for stage I interstitials in electron irradiated tungsten
    Keywords: MATERIALS, METALLIC
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Factors influencing the thermally-induced strength degradation of B/Al composites (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Literature data related to the thermally-induced strength degradation of B/Al composites were examined in the light of fracture theories based on reaction-controlled fiber weakening. Under the assumption of a parabolic time-dependent growth for the interfacial reaction product, a Griffith-type fracture model was found to yield simple equations whose predictions were in good agreement with data for boron fiber average strength and for B/Al axial fracture strain. The only variables in these equations were the time and temperature of the thermal exposure and an empirical factor related to fiber surface smoothness prior to composite consolidation. Such variables as fiber diameter and aluminum alloy composition were found to have little influence. The basic and practical implications of the fracture model equations are discussed. Previously announced in STAR as N82-24297
    Keywords: COMPOSITE MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Creep of chemically vapour deposited SiC fibres (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The creep, thermal expansion, and elastic modulus properties for chemically vapor deposited SiC fibers were measured between 1000 and 1500 C. Creep strain was observed to increase logarithmically with time, monotonically with temperature, and linearly with tensile stress up to 600 MPa. The controlling activation energy was 480 + or - 20 kJ/mole. Thermal pretreatments near 1200 and 1450 C were found to significantly reduce fiber creep. These results coupled with creep recovery observations indicate that below 1400 C fiber creep is anelastic with negligible plastic component. This allowed a simple predictive method to be developed for describing fiber total deformation as a function of time, temperature, and stress. Mechanistic analysis of the property data suggests that fiber creep is the result of beta-SiC grain boundary sliding controlled by a small percent of free silicon in the grain boundaries.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Materials Science (ISSN 0022-2461); 21; 217-224
    Format: text
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    NASA TECHNICAL REPORTS
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