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  • 1
    Electronic Resource
    Electronic Resource
    Quasielastic release in shock-compressed solids (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 429-441 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Shock- and release-wave measurements are reported for 6061-T6 aluminum [J. R. Asay and L. C. Chhabildas, in Shock Waves and High-Strain-Rate Phenomena in Metals, edited by M. A. Meyers and L. E. Murr (Plenum, New York, 1981), pp. 417–431], oxygen-free-electronic copper, and a Si-bronze alloy. Significant departure from ideal elastic-plastic response is observed in all three materials. Experimentally determined release-wave profiles show evidence for the onset of reverse plastic flow immediately upon release from the shocked state. This phenomenon is analyzed in terms of internal stresses acting on straight dislocation pileups and pinned dislocation loops created by the shock-compression process. Following shock compression and prior to release, the internal stresses are opposed by the applied shear stress; that is, they exactly balance each other and no plastic flow occurs. As the applied stress is reduced in the unloading wave, reverse plastic flow occurs immediately due to internal reverse stresses acting on these pileups and pinned loops. This effect reduces the longitudinal modulus, and hence, the release-wave speed in what we normally think of as the "elastic-wave'' regime. Interpretations of quasielastic release-wave data and calculations are expressed in terms of micromechanical concepts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351871
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  • 2
    Electronic Resource
    Electronic Resource
    Shock-wave compression and release of aluminum/ceramic composites (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5706-5718 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several composite materials consisting of ceramic particles embedded in a 6061-T6 aluminum matrix have been studied under conditions of shock-wave compression and release, including spallation. The 6061-T6 matrix represents a material for which high-rate shock-wave response has been extremely well characterized for thermoelastic-plastic deformation. The ceramic particles (alumina and mullite) are also well characterized, particularly in the elastic regime. Experimental tests consist of quasistatic, uniaxial-stress compression of both virgin and shock-recovered samples as well as time-resolved velocity interferometer measurements under conditions of flat-plate impact. The latter tests were performed with lithium fluoride windows for transmitted wave studies and free surfaces for spallation measurement. Theoretical analysis of the data is carried out with a pseudodissipation model originated by Barker [J. Composite Mat. 5, 140 (1971)] for application to elastic deformation of layered composites and generalized here to include thermoelastic-plastic properties of the constituents. For a pseudodissipative model to apply to composite material response, significant geometrical randomization must be present in the composite structure; this is something that all commercially produced composites naturally possess. Randomization produces mechanical energy traps, which convert some fraction of regular, directed motion into random elastic vibrations behind the shock front. Within a few microseconds (depending on the pinned dislocation segment density) this macroscale, continuum vibrational energy is converted to heat by means of the anelastic properties of the metal matrix. The use of pseudodissipation as a means of representing dispersive composite material behavior is thus placed on a more secure physical foundation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357078
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  • 3
    Electronic Resource
    Electronic Resource
    Shock compression of tungsten and molybdenum (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1721-1728 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New high-pressure shock-wave data have been obtained for W and Mo. These data have been combined with previous data sets for these materials to extend the range of linear us–up fits for the Hugoniot to 480 GPa for Mo and 680 GPa for W. The shock-wave data, supplemented by the necessary thermodynamic information, have been used to generate several isotherms (100, 200,...1000 K). Tables of pressure versus relative volume up to 380 GPa suitable for comparison with statically obtained data are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351203
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  • 4
    Electronic Resource
    Electronic Resource
    Release isentropes of overdriven plastic-bonded explosive PBX-9501 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6287-6293 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Continuous release isentropes for the plastic-bonded explosive PBX-9501 are obtained from velocity interferometer system for any reflector measurements at a high-explosive/LiF interface. Forward calculations from a tabular representation of the isentropes to the measured u(t) data at the interface are iterated to yield isentropes that give agreement with the data. Curves for the isentropes and for the isentropic gamma, γS=−(∂lnP/∂lnV)S are presented. Because isentropes from different overdriven states differ, a crude estimate of the Grüneisen parameter is obtained. An overall representation of the data is achieved with this Grüneisen parameter and a single isentrope through the Chapman–Jouguet state. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323513
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  • 5
    Electronic Resource
    Electronic Resource
    Overdriven-detonation and sound-speed measurements in PBX-9501 and the "thermodynamic'' Chapman–Jouguet pressure (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6129-6141 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sound speeds, at pressure, and the overdriven Hugoniot were measured for the plastic-bonded explosive PBX-9501. The two curves intersect at the Chapman–Jouguet (CJ) state because of the sonic condition D=c+u. This permitted a novel determination of the "thermodynamic'' CJ pressure. A value of 34.8±0.3 GPa was obtained. The data permit a direct experimental determination of the isentropic gamma, γS=−(∂lnP/∂lnV)S, and the Grüneisen parameter, γ=V(∂P/∂E)V, in the overdriven pressure range. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363681
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  • 6
    Electronic Resource
    Electronic Resource
    Transient impact response of three polymers (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 2520-2529 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data are presented for the transient response of three polymers, Estane, Estane with a nitro-plasticizer, and adiprene, subject to flat-plate impact. These data are analyzed in terms of a generalized Maxwell model and the theory of characteristics for the dynamical motion. Comparison of theory and experiment quantifies the high-frequency component in the Maxwell description; for Adiprene the high-frequency shear modulus and relaxation time are 300 MPa and approximately 50 ns, respectively. For estane the corresponding quantities are 300 MPa and approximately 200 ns. Low-pressure Hugoniot data are also presented for estane. An estimate of the low-pressure Hugoniot is given for Adiprene. Some experimental data are also presented for the Estane/nitro-plasticizer combination; this material is used as a binder in plastic-bonded explosives. Theory is presented for a thermodynamically consistent calculation of temperature in high-rate loading of polymers whose mechanical properties are represented by a generalized Maxwell model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368413
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  • 7
    Electronic Resource
    Electronic Resource
    Thermophysical properties of molybdenum and rhenium (1992)
    Springer
    International journal of thermophysics 13 (1992), S. 477-487 
    Details
    ISSN: 1572-9567
    Keywords: density ; electrical resistivity ; enthalpy ; molybdenum ; pulse heating technique ; rhenium ; sound velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermophysical properties measurements have been made on the metals molybdenum and rhenium at high temperatures and a pressure of 0.2 GPa. These measured properties include volume, temperature, enthalpy, and electrical resistivity. Values for these quantities are shown for both solid and liquid phases. In addition, sound velocities were measured for liquid molybdenum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503884
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  • 8
    Electronic Resource
    Electronic Resource
    Thermophysical properties of liquid platinum (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 409-416 
    Details
    ISSN: 1572-9567
    Keywords: density ; electrical resistivity ; enthalpy ; platinum ; pulse heating ; sound velocity ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Material properties of liquid metals are inherently difficult to measure. Static measurements are difficult to make on most metals because of the typically high values of critical temperature and pressure, problems with sample-container contamination, and physical strength limits of high-pressure vessels. Data on thermophysical properties of metals are needed for a variety of applications, and measurements on most liquid metals are performed using dynamic techniques. Dynamic pulse heating experiments are typically performed on nanosecond to millisecond timescales, providing data that would not otherwise be obtainable. We use a resistive pulse heating method to reach high-temperature expanded liquid-metal states at a constant pressure. This technique can be used for a variety of metals and allows accurate data to be obtained over a wide range of temperature. Metallic wire-shaped samples (1×25 mm) are resistively heated in an inert gas atmosphere for a period of about 10−4 s by an almost-square current pulse (∼15×l03 A). Samples expand along an isobaric path, with remote diagnostics providing data on current, voltage, temperature, volume, and sound speed. These basic quantities are then used to calculate several derivative quantities. We report measurements of enthalpy, temperature, volume, electrical resistivity, and sound velocity of liquid platinum for temperatures from the melting point up to ∼5100 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566040
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  • 9
    Electronic Resource
    Electronic Resource
    Sound speed in liquid lead at high temperatures (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 161-165 
    Details
    ISSN: 1572-9567
    Keywords: dynamic technique ; high pressure ; high temperature ; lead ; sound speed ; thermophysical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A dynamic technique, the isobaric expansion experiment (IEX), is used to reach high-temperature and pressure states in liquid lead. A unique technique is described for making sound-speed measurements once a final equilibrium end state is obtained. Data over an extended density range are presented. The sound speed in liquid lead over this range appears to vary linearly with density and has no dependence on temperature within our experimental precision (±7 %).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503807
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  • 10
    Electronic Resource
    Electronic Resource
    Thermophysical properties of solid and liquid tungsten (1990)
    Springer
    International journal of thermophysics 11 (1990), S. 709-718 
    Details
    ISSN: 1572-9567
    Keywords: electrical resistivity ; enthalpy ; heat of fusion ; high temperatures ; liquid metals ; pulse-heating method ; sound velocity ; specific heat ; tungsten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermophysical properties of solid and liquid tungsten have been measured up to an enthalpy ofH = 1.4 MJ · kg−1 using an isobaric expansion technique. These measurements give the pressure, temperature, volume, enthalpy, electrical resistivity, and sound velocity as fundamental quantities. From these, other properties may be calculated, such as specific heat at constant volume and pressure, heat of fusion, isothermal and adiabatic bulk moduli and compressibilities, and thermodynamicγ. Results of these calculations are presented for liquid tungsten and compared with literature values where such data exist. These data will help in understanding liquid-metal phenomenology theoretically and in the design and modeling of exploding wires, foils, and fuses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01184339
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