Effect of strain-rate dependent yield strength on crater scaling relations

Journal Article · Wed Feb 01 04:00:00 EST 1984 · Geophys. Res. Lett.; (United States)

DOI:https://doi.org/10.1029/GL011i002p00121· OSTI ID:6653247

Gaffney, E S

For materials whose strength is controlled by various creep processes, such as ice, the yield strength (Y) is often expressed in a power law relation to the strain rate (epsilon); Yproportionalepsilon-dot/sup I/n/, where n is a constant for some range of epsilon-dot. It has been shown that, for strength-dominated craters, the crater formation time is proportional to the crater radius R and to ..sqrt..Y. But the strain associated with crater formation is approximately fixed in the strength regime so the strain rate controlling crater formation will vary as ..sqrt..YR. The result of combining these two effects is that, in materials with strain-rate dependent yield strengths, there will be a small increse in cratering efficiency (mass of ejecta/mass of explosive or impactor) as size increases in the strength-dominated regime. Explosive cratering data indicate that 1.6

• Research Organization: Los Alamos National Laboratory, Low Alamos, New Mexico 87545
• OSTI ID: 6653247
• Journal Information: Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 11:2; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAVITIES
CRATERING EXPLOSIONS
CRATERS
CREEP
EXCAVATION
EXPLOSIONS
ICE
MECHANICAL PROPERTIES
SCALING LAWS
STRAIN RATE
YIELD STRENGTH