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  • 1
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    Acoustic imaging at the planetary scale (1991)
    Department of Earth and Planetary Sciences, Harvard University
    In:  Cambridge, Department of Earth and Planetary Sciences, Harvard University, vol. LXXVIII, no. 2, pp. 125-169, (ISBN 0-521-00098-X)
    Details
    Publication Date: 1991
    Keywords: Tomography ; Seismology ; Acoustics ; Dziewonski
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
    Electronic Resource
    Electronic Resource
    Comparative structure and physical properties of W—Ni—Fe alloys containing 95 and 25wt% tungsten (1986)
    Springer
    Journal of materials science 5 (1986), S. 413-414 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01672345
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    High strain rate properties of three liquid phase sintered tungsten alloys (1990)
    Springer
    Journal of materials science 9 (1990), S. 187-191 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727711
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Failure mechanisms in impacting penetrators (1992)
    Springer
    Journal of materials science 27 (1992), S. 6411-6416 
    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 Experiments are described on (i) the simple Taylor test where a flat-ended projectile mushrooms against a semi-infinite “rigid target”, (ii) penetration of conically tipped cylindrical projectiles into semi-infinite targets, (iii) the use of modified nose geometries to direct the pattern of shear failure and (iv) the impact of balls on thin plates. Macro- and micro-structural investigation of fractured penetrators illustrates mechanisms of ductile fracture, intergranular and transgranular brittle fractures, and adiabatic shear. Stress analysis highlights those regions subjected to prolonged hydrostatic tensile stresses during impact indicating fracture by spalling, and those regions where persistent velocity discontinuities or planes of maximum shear strain rate indicate adiabatic shear failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576292
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of sinter duration on the mechanical properties of a tungsten alloy (1992)
    Springer
    Journal of materials science 27 (1992), S. 6490-6494 
    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 effect of sinter duration on the tensile strength and ductility in tension of a 95%W-3.5%Ni-1.5%Fe alloy was shown to be negligible. The alloy showed a broad ductile to brittle transition as the testing temperature was reduced below 100°C, and this was also unaffected by the sinter duration. Despite the negligible change in mechanical properties with sinter duration, the fracture mode changed with an increased proportion of transgranular tungsten grain fracture at the expense of tungsten-tungsten interface fracture, at the longer sintering times. Quantitative metallography showed that grain size increases and tungsten-tungsten spheroid interface area decreased with increasing sintering time. The mechanical property and fracture morphology observations have been interpreted in terms of these microstructural changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576302
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of microstructural anisotropy on the mode of plate failure during projectile impact (1985)
    Springer
    Journal of materials science 20 (1985), S. 854-858 
    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 Changes in the failure mode of rolled steel plate during projectile impact were examined in terms of the angle between the planes of microstructural inhomogenieties in the steel and the plane of the target. Two failure modes were identified: (1) discing failure involving multiple shear band formation in the rolling plane with separation along the shear bands to form a disc segment, and (2) tensile star cracking with the propagation of a tensile tear through the rear surface of the plate. Both the ballistic resistance and the predominant mode of failure were critically dependent on the orientation of the microstructural banding in the plate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585726
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  • 7
    Electronic Resource
    Electronic Resource
    Tensile rupture of tungsten alloys by the cascade of crack nucleation events (2000)
    Springer
    Journal of materials science 35 (2000), S. 4067-4072 
    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 Quantitative metallographic methods are used to relate alloy ductility to microstructural fracture mechanisms for ten tungsten-nickel-iron alloys with Ni/Fe ratios of 7 : 3 and 1 : 1 and over the tungsten composition range 87.5 to 97.5 weight percent. These techniques are used to characterize the crack nucleation state at the rupture strain. The observations are consistent with fracture by load shedding and a cascade of nucleation events within a narrow zone in the sample. An instability analysis is presented which includes reduction in area due to both tensile plastic strain and to the development of crack nuclei within the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004886221158
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of temperature on the fracture of a W-Ni-Fe alloy (2000)
    Springer
    Journal of materials science 35 (2000), S. 4319-4324 
    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 A 95wt%W 3.5wt%Ni 1.5wt%Fe alloy is strained to failure in uniaxial tension at temperatures in the range −100°C to 300°C. The fracture surfaces of the tensile specimens are examined and the contributions from the fracture mechanisms: tungsten-tungsten intergranular decohesion, tungsten-binder interface decohesion, binder rupture and tungsten cleavage, are identified as a function of temperature. The observed variations are explained in terms of the flow stress temperature dependence of the two phases within the alloy. The results are consistent with a changing mode of specimen rupture from one of a localized cascade of nucleation events at low temperatures to one of crack propagation through linking of cracks within the necked region of the specimens deformed at higher temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004840503664
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  • 9
    Electronic Resource
    Electronic Resource
    Failure examination of composite materials using standard metallographic techniques (1991)
    Springer
    Journal of materials science 10 (1991), S. 333-334 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00719700
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of strain rate on the properties of an aluminium-lithium alloy (1992)
    Springer
    Journal of materials science 11 (1992), S. 785-787 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00729493
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