抄録
conducted deformation experiments of ice -1μm silica beads mixtures to clarify the
e ects of silica beads volume fraction and temperature on the flow law. The silica beads volume
fraction,φ, was changed from 0 to 0.63 to simulate the surfaces of icy bodies like layered structures
on Mars polar region, and two color regions on Ganymede. Unconfined uniaxial compression tests
were made in a cold room at the temperatures from -10 to -25℃ in ILTS, Hokkaido University and
we set constant strain rates ranged from 2.9×10-3 to 8.5×10-7 s-1. We determined the flow law of
mixture written by ε=A・σmax nfrom the relationship between maximum stress,σmax, on the stressstrain
curve and applied strain rate,ε. At -10℃, the mixtures with silica volume fractions of 0.004-
0.04 had almost the same maximum stress with pure ice and the stress exponent,n,is about 3. On the
other hands, at the silica volume fractions more than 0.15 , the mixture became harder as silica
volume fraction increased, and it also had the same stress exponent, about 6. Also, we found that A
for silica volume fractions more than 0.15 was written by an exponential equation related to silica
volume fraction, A=6.86×10-8 exp (-6.35φ). Furthermore, we found that n of 0.15 was independent
of temperature, about 6.2, and the brittle-ductile boundary of φ=0.29 and 0.63 was 30-50℃ higher
than that of pure ice.
