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  • 1
    Electronic Resource
    Electronic Resource
    Elastic constants of a graphite-magnesium composite (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3411-3416 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This study contains three components: measurement, modeling, and inverse modeling to get the fiber elastic constants. The studied composite consisted of 70 vol % continuous uniaxial graphite fibers in a magnesium matrix. By ultrasonic-velocity methods, we measured the composite's complete orthotropic-symmetry (nine-independent-component) elastic-constant tensor: Cij in Voigt contracted notation. Approximately, the composite shows transverse-isotropic symmetry. For a model, we used a wave-scattering method in the long-wavelength limit. The model requires two inputs: the two isotropic matrix elastic constants and the five anisotropic fiber elastic constants. We measured the first and guessed the second based on graphite-fiber elastic constants reported by others. This guess gave good measurement-model agreement only for C11, C22, and C33. Especially, the shear moduli Cii (i=4,5,6) agreed poorly (a 20% difference). Using inverse modeling—calculating fiber properties from measured matrix properties and measured composite properties—we estimated the anisotropic fiber elastic constants. For the fiber we predict a Young-modulus anisotropy of 12 and a principal Poisson ratio range of 0.03–0.37.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342658
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  • 2
    Electronic Resource
    Electronic Resource
    Young modulus and internal friction of a fiber-reinforced composite (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1972-1976 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By a kilohertz-frequency resonance method we determined the Young modulus and internal friction of a uniaxially fiber-reinforced composite. The composite comprised glass fibers in an epoxy-resin matrix. We studied three fiber contents: 0, 41, and 49 vol %. The Young modulus fit a linear rule of mixture. The internal friction fit a classical free-damped-oscillator model where one assumes a linear rule of mixture for three quantities: mass, force constant, and mechanical-resistance constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336375
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comment on "The elastic stiffness coefficients of nickel-iron single-crystal alloys at room temperature'' (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 5069-5070 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We respond to the recent claim that in face-centered-cubic Fe-Ni alloys the two cubic elastic-shear coefficients, C44 and (C11−C12)/2, vary linearly with composition. Both theory and measurement support a nonlinear variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335285
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Monocrystal elastic constants of NbC (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1614-1617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using ultrasonic methods at ambient temperatures, for niobium carbide we determined the monocrystalline elastic stiffnesses: C11, C12, and C44 in Voigt's contracted notation. From these, we calculated the quasi-isotropic (polycrystalline) elastic constants and the elastic Debye characteristic temperature. Results derived from a Blackman diagram suggest that ionic forces contribute significantly to the elastic constants and to interatomic bonding. This conclusion applies not only to NbC but also to other MX carbides with an NaCl-type crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337249
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  • 5
    Electronic Resource
    Electronic Resource
    Manganese contributions to the elastic constants of face centred cubic Fe-Cr-Ni stainless steel (1985)
    Springer
    Journal of materials science 20 (1985), S. 2923-2929 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We determined experimentally the effect of manganese on the elastic constants of face centred cubic Fe-Cr-Ni alloys with chemical compositions near 304-type stainless steel. By a pulse-echo-overlap method, longitudinal and transverse soundwave velocities were determined in ten alloys containing up to 6% manganese. All the elastic stiffnesses decrease linearly with increasing manganese. The bulk modulus decreases most strongly. Poisson's ratio changes least. We consider what the elastic constants reveal concerning changes in chemical bonding, caused by manganese additions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553056
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  • 6
    Electronic Resource
    Electronic Resource
    Molybdenum effect on volume in Fe-Cr-Ni alloys (1988)
    Springer
    Journal of materials science 23 (1988), S. 3120-3124 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract By X-ray diffraction on powder specimens, we determined the unit-cell size for six facecentred-cubic Fe-Cr-Ni alloys, nominally Fe-19Cr-12Ni (at%). In these alloys, the molybdenum content ranged up to 2.4 at%. We found that molybdenum increases volume: 0.45% per at%. Usual models based on atomic volumes and elastic compressibilities fail to explain the large volume increase. We ascribe the discrepancy to changes in interatomic bonding, which we describe in terms of 3d-electron models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551282
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  • 7
    Electronic Resource
    Electronic Resource
    Low-temperature manganese contributions to the elastic constants of face-centred-cubic Fe-Cr-Ni stainless steel (1988)
    Springer
    Journal of materials science 23 (1988), S. 2129-2132 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract By ultrasonic methods, we determined the elastic constants between 295 and 4 K of nominally Fe-18Cr-8Ni alloys (in wt%) containing up to 6% manganese. We report five elastic constants:C 1 = longitudinal modulus,B = bulk modulus,E = Young modulus,G = shear modulus, and v = Poisson ratio. At all temperatures, manganese lowers all these elastic constants. With the exception of v, larger reductions occur at 4 K than at 295 K. At 4 K, the bulk modulus decreases more than the shear modulus: approximately 0.54 and 0.30% per per cent manganese, respectively. Manganese raises the magnetic-transition temperature, which occurs between 40 and 90 K, by approximately 9 K per per cent manganese. A simple model predicts the volume increase accompanying Mn alloying. However, a simple model fails to predict the elastic-constant reductions; this suggests magnetic interatomic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01115779
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Texture in stainless steel welds: an ultrasonic study (1985)
    Springer
    Journal of materials science 20 (1985), S. 1720-1724 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We studied texture effects in five AISI-316 stainless-steel welds. We measured nine independent ultrasonic velocities along the weld's principal axes. These velocities reveal a strong texture different from the 〈0 0 1〉 fibre-type usually attributed to these materials The texture is independent of delta-ferrite content and must contain a strong 〈110〉 component related to the f c c monocrystal elastic constantC′=(C 11−C 12)/2. A postulated ideal (0 0 1) [1 1 0] plate-type texture explains the range of measured longitudinal and transverse sound velocities, but not their detailed values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555276
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Low-temperature elastic properties of four wrought and annealed aluminium alloys (1975)
    Springer
    Journal of materials science 10 (1975), S. 1309-1316 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The elastic properties of four annealed polycrystalline commercial aluminium alloys were studied between 4 and 300 K using a pulse-superposition method. Results are given for longitudinal sound velocity, transverse sound velocity, Young's modulus, shear modulus, bulk modulus (reciprocal compressibility), Poisson's ratio, and elastic Debye temperature. The elastic stiffnesses of the alloys increase 4 to 13% on cooling from room temperature to liquid helium temperature. The elastic constant-temperature curves exhibit regular behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540820
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