Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..233k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 233-242.
Astronomy and Astrophysics
Astrophysics
18
Asteroids, Astronomical Models, Impact Damage, Phobos, Solar System, Aluminum, Fragmentation, Gypsum, Meteorite Collisions, Planets, Satellites, Experiments, Impacts, Fracturing, Mars, Phobos, Laboratory Studies, Velocity, Procedure, Shock Effects, Patterns, Comparisons, Grooves, Surface, Features, Origin, Formation, Fragments, Asteroids, Physical Properties, Diagrams, Mass, Size, Distribution, Fragmentation, Craters, Stickney, Gravity Effects, Hypotheses
Scientific paper
Aluminum, polyacetal, and nylon projectiles were launched at gypsum ellipsoids having dimensions of 13.8 x 11.7 x 10.5 cm, the proportions of which are similar to those of Phobos. Two separate experimental series were conducted: one for low-impact velocities of 100 to 760 m/s, the other for higher velocities ranging from 2.8 to 4.2 km/s. Even for impact velocities above 2 km/s, the impact-generated fracturing was quite similar to that formed by the low-velocity impacts. This was probably due to the low shock impedance and porous nature of the targets used in this study. Comparison of the experimental results with previous studies suggests that fracture patterns are mainly dependent on the type of target material rather than the projectile's impact velocity. Differences in fracture patterns between the core-type and cone-type fragmentation indicate different fracturing mechanisms. Fracture patterns formed on the gypsum targets were compared with the distribution of grooves on Phobos and their origin was discussed.
Arakawa Masahiko
Capaccioni Fabrizio
Cerroni Pricilla
Fujiwara Akira
Kanaori Y.
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