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  • Other Sources  (2,141)
  • FLUID MECHANICS AND HEAT TRANSFER  (1,556)
  • COMPOSITE MATERIALS  (585)
  • 1990-1994  (2,141)
  • 1992  (1,134)
  • 1991  (1,007)
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  • Other Sources  (2,141)
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  • 1990-1994  (2,141)
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  • 1
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    The Role of the Interface in Refractory Metal Alloy Composites (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-10-04
    Description: Creep-rupture and tensile tests have been used to evaluate thoriated W-wire reinforced Nb-1 percent Zr alloy matrix composites fabricated via arc-spray monotape technique. A significant creep strength enhancement was observed over the unreinforced matrix alloy while matrix integrity was maintained; the fiber/matrix interface phase is noted to be a strong and ductile W/Nb alloy, which is formed due to the mutual solubility of the constituent metals. High strength, toughness, and thermal stability are demonstrated by this material system, which is also resistant to liquid alkali metal corrosion.
    Keywords: COMPOSITE MATERIALS
    Type: In: Space nuclear power systems; Proceedings of the 8th Symposium, Albuquerque, NM, Jan. 6-10, 1991. Pt. 1 (A93-13751 03-20); p. 186-192.
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  • 2
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    Mechanics of interfaces in fiber reinforced SiC/RBSN ceramic matrix composites (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-12-09
    Description: The mechanical behavior of continuous fiber reinforced SiC/RBSN composites with strong and weak interface characteristics is evaluated. Both catastrophic and noncatastrophic failures are observed in tensile specimens. Effects of fiber/matrix interface debonding (splitting) parallel to the fibers are discussed. Micromechanical models incorporating residual stresses to calculate the critical matrix cracking strength, ultimate strength and work of pull-out are reviewed and used to predict composite response. Experimental results are compared to analytical predictions.
    Keywords: COMPOSITE MATERIALS
    Type: In: Mechanics of composites at elevated and cryogenic temperatures; Proceedings of the Symposium, ASME Applied Mechanics Conference, Columbus, OH, June 16-19, 1991 (A93-32451 12-39); p. 217-229.
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  • 3
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    Elevated temperature compressive properties of reaction milled NiAl-AlN and Zr-doped NiAl-AlN composites (1992)
    In:  Other Sources
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    Publication Date: 2011-12-09
    Description: Previous studies of a single lot of NiAl powder which had been ground under high intensity conditions in liquid nitrogen (cryomilling) indicated that this processing leads to a high strength, elevated temperature NiAl-AlN composite. Because this was the first known example of the use of the reaction milling process to produce a high temperature composite, the reproducibility of this technique was unknown. Two additional lots of NIAl powder and a lot of a Zr-doped NiAl powder have been cryomilled, and analyses indicate that AlN was formed within a NiAl matrix in all three cases. Compression testing between 1200 K and 1400 K has shown that the deformation resistance of these heats is similar to that of the first lot of NiAl-AlN; thus cryomilling can improve the creep resistance of NiAl by a factor of six. Based on this work, it is concluded that cryomilling of NiAl powder to form high temperature, high strength NiAl-AlN composites is a reproducible process.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Materials Research (ISSN 0884-2914); 7; 10; p. 2724-2732.
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  • 4
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    Finite difference solution for transient radiative cooling of a conducting semitransparent square region (1992)
    In:  Other Sources
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    Publication Date: 2011-12-09
    Description: Transient solutions were obtained for a square region of heat conducting semitransparent material cooling by thermal radiation. The region is in a vacuum environment, so energy is dissipated only by radiation from within the medium leaving through its boundaries. The effect of heat conduction during the transient is to partially equalize the internal temperature distribution. As the optical thickness of the region is increased, the temperature gradients increase near the boundaries and corners, unless heat conduction is large. The solution procedure must provide accurate temperature distributions in these regions to prevent error in the calculated radiation losses. Two-dimensional numerical Gaussian integration is used to obtain the local radiative source term. A finite difference procedure with variable space and time increments is used to solve the transient energy equation. Variable spacing was used to concentrate grid points in regions with large temperature gradients.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Heat and Mass Transfer (ISSN 0017-9310); 35; 10; p. 2579-2592.
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  • 5
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    Reaction of beta-phase Ni-Al alloys with CrB2 (1991)
    In:  Other Sources
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    Publication Date: 2011-12-09
    Description: Reaction of Ni-Al alloys within the beta-NiAl phase with CrB2 was studied at 1473 K as a function of Al concentration in the alloy. Reaction of 49-50 at. pct Al alloys with CrB2 occurred by interdiffusion of Ni into CrB2 and Cr into the alloy without forming a new product phase. On the other hand, a new product phase, rich in Ni and B, formed by the reaction of alloys having Al concentrations 48 at. pct or lower with CrB2. The reaction product was observed both at the CrB2/alloy interface and along the alloy grain boundaries.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Materials Research (ISSN 0884-2914); 6; 1664-167
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  • 6
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    Direct numerical simulations of a spatially developing plane wake (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: In the present paper, direct numerical methods by which to simulate the spatially developing free shear flows in the transitional region are described and the numerical results of a spatially developing plane wake are presented. The incompressible time-dependent Navier-Stokes equations were solved using Pade finite difference approximations in the streamwise direction, a mapped pseudospectral Fourier method in the cross-stream direction, and a third-order compact Runge-Kutta scheme for time advancement. The unstable modes of the Orr-Sommerfeld equations were used to perturb the inlet of the wake. Statistical analyses were performed and some numerical results were compared with experimental measurements. When only the fundamental mode is forced, the energy spectra show amplification of the fundamental and its higher harmonics. In this case, unperturbed alternate vortices develop in the saturation region of the wake. The phase jitter around the fundamental frequency plays a critical role in generating vortices of random shape and spacing. Large- and small-scale distortions of the fundamental structure are observed. Pairing of vortices of the same sign is observed, as well as vortex coupling of vortices of the opposite sign.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: JSME International Journal, Series II (ISSN 0914-8817); 35; 4; p. 543-548.
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  • 7
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    Thermal radiation heat transfer (3rd revised and enlarged edition) (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: This book first reviews the overall aspects and background information related to thermal radiation heat transfer and incorporates new general information, advances in analytical and computational techniques, and new reference material. Coverage focuses on radiation from opaque surfaces, radiation interchange between various types of surfaces enclosing a vacuum or transparent medium, and radiation including the effects of partially transmitting media, such as combustion gases, soot, or windows. Boundary conditions and multiple layers are discussed with information on radiation in materials with nonunity refractive indices.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ; 1090 p.
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  • 8
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    A general approach for the prediction of localized instability generation in boundary layer flows (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The present approach to the prediction of instability generation that is due to the interaction of freestream disturbances with regions of subscale variations in surface boundary conditions can account for the finite Reynolds number effects, while furnishing a framework for the study of receptivity in compressible flow and in 3D boundary layers. The approach is illustrated for the case of Tollmien-Schlichting wave generation in a Blasius boundary layer, due to the interaction of a freestream acoustic wave with a localized wall inhomogeneity. Results are presented for the generation of viscous and inviscid instabilities in adverse pressure-gradient boundary layers, supersonic boundary layer instabilities, and cross-flow vortex instabilities.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: In: Boundary layer transition and control; Proceedings of the Conference, Univ. of Cambridge, United Kingdom, Apr. 8-12, 1991 (A93-17251 04-34); p. 45.1-45.20.
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  • 9
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    Evaluation of the mechanical properties and damage tolerance of five new toughened matrix composite materials (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Notched and unnotched tension and compression properties of quasi-isotropic laminates are presently evaluated, in conjunction with compression-after-impact (CAI) strengths, for the cases of five different carbon fiber-reinforced/toughened matrix composites. For a given impact energy, CAIs were dependent on impact velocities. When compared with other matrix-toughened materials, the five presently considered were more damage-tolerant than such aircraft primary structure composite systems as T300/5208.
    Keywords: COMPOSITE MATERIALS
    Type: In: International SAMPE Symposium and Exhibition, 37th, Anaheim, CA, Mar. 9-12, 1992, Proceedings (A93-15726 04-23); p. 1312-1324.
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  • 10
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    Toughening of PMR composites by gradient semi-interpenetrating networks (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The toughening of the PMR-15 and LARC RP-46 high temperature thermosetting polyimides is presently attempted through the construction of a semiinterpenetrating network at ply interfaces through the use of the Matrimid 5218 thermoplastic polyimide powder, whose 315-320 glass transition temperature is compatible with the PMR matrices. The 60 vol pct fiber composites thus prepared for the two resins, with and without toughening, were comprehensively characterized in flexure, tension, intralaminar and short beam shear, compression and quasi-isotropic short-block compression, as well as modes I and II interlaminar fracture toughness and compression after impact.
    Keywords: COMPOSITE MATERIALS
    Type: In: International SAMPE Symposium and Exhibition, 37th, Anaheim, CA, Mar. 9-12, 1992, Proceedings (A93-15726 04-23); p. 690-704.
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