Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..354r&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 354 (SEE N92-10728 01-91)
Physics
Geophysics
Asteroids, Collisions, Computer Programs, Continuum Modeling, Fragmentation, Fragments, Hypervelocity Impact, Two Dimensional Models, Collision Parameters, Fracturing, Mass Distribution, Mathematical Models, Size Distribution, Strain Rate, Stress-Strain Relationships, Tensile Stress
Scientific paper
A two dimensional hydrocode based on 2-D SALE was modified to include strength effects and fragmentation equations for fracture resulting from tensile stress in one dimension. Output from this code includes a complete fragmentation summary for each cell of the modeled object: fragment size (mass) distribution, vector velocities of particles, peak values of pressure and tensile stress, and peak strain rates associated with fragmentation. Contour plots showing pressure and temperature at given times within the object are also produced. By invoking axial symmetry, three dimensional events can be modeled such as zero impact parameter collisions between asteroids. The code was tested against the one dimensional model and the analytical solution for a linearly increasing tensile stress under constant strain rate.
Aspaug Erik
Melosh Henry Jay
Ryan Eileen V.
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