Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p21b0532u&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P21B-0532
Physics
3909 Elasticity And Anelasticity, 5100 Physical Properties Of Rocks, 5102 Acoustic Properties, 5134 Thermal Properties, 5144 Wave Attenuation
Scientific paper
Recent space exploration studies have focused attention on the composition of Martian and Lunar surfaces. These studies have found large quantities of silicates and basaltic rocks, similar to the composition of the terrestrial surface. The atmospheric conditions, however, differ wildly from that found on Earth. Mars has surface temperatures ranging from 140 K to 240 K, while the moon exhibits a more extreme environment with temperatures ranging from 80 K to 380 K. This vast difference in conditions can result in physical properties of the surface materials that are different from expected, based on our knowledge of similar materials here on Earth. Preliminary experiments investigating the properties of rocks at cold temperatures (4~K to 300~K) have shown interesting unexpected behavior in samples of Berea sandstone (a silicate) and a common basalt from Los Alamos New Mexico [Ulrich and Darling, 2001]. A simple elastic solid should show a monotonic increase in the elastic constants as temperature decreases. The basalt samples show this gross behavior while the sandstone shows a very unexpected anomalous regime between 40~K and 200~K where the elastic constants decrease with decreasing temperature. Both rocks show temperature-dependent structure in the modulus and internal friction, and significant hysteresis, indicating history and rate-dependent properties. Ulrich T.J., Darling T.W., ``Observation of anomalous elastic behavior in rock at low temperatures." Geophys. Res. Let., Vol. 28, No. 11, pgs. 2293-2296, June 1, 2001.
Darling T. W.
McCall K. R.
Ulrich T. J.
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