Laboratory simulation of planetesimal collision

Details Laboratory simulation of planetesimal collision Laboratory simulation of planetesimal collision

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710968m&link_type=abstract

Journal of Geophysical Research, vol. 87, Dec. 10, 1982, p. 10968-10982.

Other

36

Collision Parameters, Impact Damage, Petrology, Protoplanets, Rock Mechanics, Space Environment Simulation, Basalt, Fragments, Mechanical Properties, Particle Size Distribution, Projectiles

Scientific paper

Low-velocity impact experiment on rocks was performed to reveal the nature of the collision process of planetesimals. Projectiles of mild steel (S15CK) and rocks (tuff and basalt) with velocities of 17 to 270 m/s were impacted against four kinds of rocks (tuff, basalt, granite, and dunite) with various shapes and sizes. Imparted energy divided by target mass Ei ranges 106 to 108 erg/g. Collisional phenomena associated with low-velocity impact experiment were shown to be different from those observed in the high-velocity impact experiment. The difference in mechanical properties between projectile and target significantly influenced the collisional behavior. For collision between rocks with similar mechanical properties, relative size between projectile and target played an important role in determining the collisional mode: only the smaller body was destroyed completely, and the larger body suffered no damage even if the released Ei was enough to destroy both colliding bodies simultaneously. This observation suggests an important implication in the early stage of planetary formation, that runaway growth of the largest planetesimal takes place even when the collision condition prefers catastrophic destruction to other collision types.

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