Ice771: std ice; Seidemann/Prior stress drop study

T = 240 K, P = 50 MPa, s = 6, 7 MPa; to e = 0.02? step (1)
T = 240 K, P = 50 MPa, s = 8, 7, 6 MPa; to e = 0.08 step (2)

 

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 ice767 is roughly ____ MPa/mV, with a __ mV zero offset. Horizontal scale is time. 5000 ≈ 14 hrs.
     
e = 0.017

 

 

At point of first step up from 6 ot 7 MPa, when edot was apparently slower than we wanted. Kept chasing to either get a high enough edot, or then as it started to accelerate at 8 MPa, keep edot low enough. End of run total e ~0.08.

7/21/14 ~1247 hrs