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  • 1990-1994  (4)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Shock wave equation of state of powder material (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 809-813 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A model is proposed to predict the following quantities for powder materials compacted by shock waves: the pressure, the specific volume, the internal energy behind the shock wave, and the shock-wave velocity Us. They are calculated as a function of flyerplate velocity up and initial powder specific volume V00. The model is tested on Cu, Al2024, and Fe. Calculated Us vs up curves agree well with experiments provided V00 is smaller than about two times the solid specific volume. The model can be used to predict shock-wave state points of powder or solid material with a lower or higher initial temperature than room temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356434
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  • 2
    Digitale Medien
    Digitale Medien
    Scanning tunneling microscopy imaging of transition-metal dichalcogenides (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2402-2404 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Structural features of TiS2 were studied by scanning tunneling microscopy (STM) and single-crystal x-ray diffraction was applied as a complementary technique. STM images in air and at room temperature revealed, besides the trigonal symmetry of the lattice, several new features having this symmetry as well. We conclude that these features are not only to be described by structural defect phenomena which affect sites in the 1T-CdI2 structure but tetrahedral sites as well. Sample orientation determination by x-ray diffraction provides a unique relation between feature types and sites. A model is proposed in which displaced Ti atoms account for the observed features.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103250
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Shock wave velocity and shock pressure for low density powders: A novel approach (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 933-935 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A novel approach is presented to predict the shock wave velocity as well as the shock wave pressure in powder materials. It is shown that the influence of the specific volume behind the shock wave on shock wave velocity and shock pressure decreases with decreasing initial powder density. The new model is compared with experimental data of various materials: Fe, Cu, Al, C, UO2, Ce2O3, SiO2 (quartz), NaCl, and polystyrene. It is concluded that the model holds in particular for initial powder densities less than 50% and for flyer plate velocities up to 5 km/s.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.110976
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  • 4
    Digitale Medien
    Digitale Medien
    Thermodynamic model of the compaction of powder materials by shock waves (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 203-209 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: For powder materials a model is proposed to predict the mean temperature behind the shock wave, the ratio between the increase of thermal energy and increase of total internal energy, as well as the mean final temperature after release of adiabatic pressure. Further, the change of pressure, specific volume, and the internal energy behind the shock wave are calculated together with the shock-wave velocity. All these variables are supposed to depend exclusively on flyer plate velocity, initial powder density, and initial powder temperature. The ratio between the increase of thermal energy and increase of total internal energy decreases rapidly upon decreasing initial powder density, resulting in a higher shock temperature and a lower shock pressure; therefore, a lower initial powder density results in a better bonding between the particles and fewer cracks after pressure release. Calculations are carried out for copper and agree fairly well with experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.355885
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