On the brittle-ductile behavior of iron meteorites - New experimental constraints

Details On the brittle-ductile behavior of iron meteorites - New experimental constraints On the brittle-ductile behavior of iron meteorites - New experimental constraints

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15..323m&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

Physics

1

Brittleness, Ductility, Impact Tests, Iron Meteorites, Planetary Evolution, Protoplanets, Spallation, Meteorites, Iron Meteorites, Experiments, Samples, Meteorite, Impacts, Gibeon, El Sampal, Arispe, Thermal Effects, Spallation, Fractures, Velocity, Parent Bodies, Core, Hypotheses

Scientific paper

Impact trials were performed at the NASA vertical gun range to study low-temperature brittle-ductile transitions in meteoritic, steel and iron targets. The trials were performed to enhance the data base underlying the concept of formation of planetesimals in collisional coagulation. Impact velocities of 1.6-5.5 km/sec were used, as were temperatures from 100-300 K. Spallation was observed in the tests with meteorite samples, even at room temperature, and brittleness was enhanced at temperature below 200 C. Net mass losses were induced at the higher impact velocities. It is suggested that iron meteorite agglomerations could form in the inner solar region during nebular condensation, but would not form in farther-out regions such as the asteroid belt. The protoplanets could have an iron core, with metallicity decreasing with radius from the core, which may have happened with the earth.

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