Ice640: 90:10 by volume ice I:MPCH

T = 210 K, P = 50 MPa, s = 4 MPa step (1)
T = 200 K, P = 50 MPa, s = 8 MPa step (2a), (2b)
T = 210 K, P = 50 MPa, s = 4 MPa step (3)

After compaction, before deformation

After deformation

Legend: Upper graph of each pair is motor speed V (proportional to edot); lower graph is load (in volts). Translate motor V to edot thus: V1.00 ≈ 6e-6/s ≈ 2%/hr. Load to stress translation for ice640 is roughly 0.27 MPa/mV, with a ~4 mV zero offset. Horizontal scale is time. 5000 ≈ 14 hrs.
 

Summary plot as of end of run. This run and the other 10% MPCH run clearly suggest textural effects. For comparison with pure ice, note that ice fraction is (and always has been for the perchlorate series) standard ice seed, not f.g. ice.

Note how much more pronounced the effect of MPCH is at 210 K than at 200 K.
  Scanned page from lab book
e=0.163 1603 hrs. End of run.
e=0.154 5/24/11 0937 hrs 5/24. Step (3) continues.
e=0.132 2023 hrs 5/23. Start step (3). edot far slower than it was 5% strain ago under the same conditions in step (1). AND note that sample was strain softening throughout step (1). Here we see a slight work _hardening_.
e=0.107 2203 hrs 5/20/11. End step (2b). Let sample sit for 2+ days at 200 K, P drifting down slowly from 50 to ~38 MPa.
e=0.102 1107 hrs 5/20/11. Step (2b) continues.
e=0.095 2313 hrs 5/19/11. Start step (2b).
   

 
e=0.088 1307 hrs 5/19/11. End of step 2(a).
e=0.085 0839 hrs 5/19/11. Step (2a) continues.
e=0.073 1927 hrs 5/18/11. Start of step (2).
e=0.062 1958 hrs 5/17/11. Step (1). Note strain softening for most of run, which is a little unusual. Plan is to probe lower Ts, and in the final step return to 210 K.