ANEOS extensions for modeling hypervelocity impact

✍ Scribed by David L. Littlefield

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 734 KB
• Volume: 20
• Category: Article
• ISSN: 0734-743X
• DOI: 10.1016/s0734-743x(97)87442-8

✦ Synopsis

Several extensions have been implemented into the ANEOS analytical equation of state package [1]. The extensions permit more precise control of the properties of the liquid-vapor dome region of the equation of state. Different algebraic forms for the cold component were examined, including a modified form of the Morse-Coulomb potential currently used in ANEOS, the Lennard-Jones potential, and an analytic EXP-N formulation [2]. Extensions to the interpolation method for the nuclear component between the solid and vapor regions were also performed. In general, these extensions allow for more positive control over the position of the critical point and the shape of the liquid-vapor dome. The critical point and liquid-vapor dome shape can have a significant influence on the results from hyperveiocity impact events, since release isentropes often pass near the critical point and directly through the high-pressure regions of the dome. To demonstrate this, several impact calculations from projectiles striking thin shields are performed using CTH [3]. The results show that the form of the equation of state can alter the structure and properties of the resulting debris cloud.