Ice775: std ice; Seidemann/Prior stress drop study

T = 240 K, P = 50 MPa, s = 8 MPa to e = 0.15 step (1)
T = 240 K, P = 50 MPa, s = 3 MPa to e = 0.19 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 ice ___is roughly ___ MPa/mV, with a __mV zero offset. Horizontal scale is time. 5000 ≈ 14 hrs.

     
e = 0.189

 

 

End step (2). Zero check in the middle there.

 

7/31/14 1456 hrs

e = 0.178

 

 

Start of step (2)

 

7/31/14 0850 hrs

e = 0.151

 

Watching s relax from 8 to 3 MPa, including some accidentally turning on driver motor (WBD again) a couple of times.

 

7/30/14 2001 hrs

e = 0.071

 

 

End of step (1). Bump downward in s and edot was WBD accidentally disabling motor driver for a shot period of time.

 

7/30/14 1937 hrs

e = 0.047

 

 

Step (1)

 

7/30/14 1631 hrs

e = 0.016

 

 

Very start of step (1)

 

7/30/14 1437 hrs