| Legend: top graph of each pair is motor speed V (i.e., edot), bottom is load. Top graph is the one to pay attention to. Translate V to edot thus: V0.05 ≈ 3e-8/s (for 10:1 gearing V0.05 ≈ 3e-7/s). Horizontal scale is time. 5000 pts ≈ 14 hrs. |
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e=0.1043.png) |
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...2312 hrs 2/21. At point # 19453 ± ~4, i.e. ~12 ± 1 min after previous screen shot was taken, the jacket perforated. Coincidence? What else could it be?
Luckily HJL happened to check, caught the problem, and a few mins later (at # 19838) stopped the piston. Probably little additional deformation to sample after jacket failure aside from elasticity of loading column.
Sample looks excellent. Stay tuned for photos. |
e=0.1031.png) |
e=0.1031 |
2145 hrs 2/21, looking almost perfect. No real need to carry on much longer.
And then... |
e=0.0994.png) |
e=0.0994 |
0915 hrs 2/21. Sorry it took so long to get the waviness out; we were a little nervous about damping the control parameters (P,I) lest we react too slowly to rapid hardening of the sample. |
e=0.0949.png) |
e=0.0949 |
2000 hrs 2/20. Running about 7x faster at 50 MPa vs 30 MPa, still slowing. Will run for at least 24 more hrs. |
e=0.0892.png) |
e=0.0892 |
0830 hrs 2/20. Note change to 100:1 gears. |
coarse.png) |
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Same as previous, coarser y axes. We turned up s from 30 to 50 MPa in a couple of steps, keeping in mind the runaway situation we encountered with 565. No runaways here. |
e=0.0835.png) |
e=0.0835 |
~1730 hrs 2/19. Start of step (2). 10:1 gears. |
e=0.0720.png) |
e=0.0720 |
0830 hrs 2/19. Acts like the new s.s., but will take months to prove at this rate. Look for step (2), see above, in a couple of hours. |
e=0.0713.png) |
e=0.0713 |
~2000 hrs 2/18. |
e=0.0707.png) |
e=0.0707 |
0830 hrs 2/18. As predicted, sort of. |
e=0.0697.png) |
e=0.0687 |
1915 hrs 2/17. Uh-oh, a time to worry? Nah. My theory: we hit a hard spot and the sample will soften back up again, the exception thus proving the rule. |
e=0.0688.png) |
e=0.0688 |
0700 hrs 2/17 |
e=0.0680.png) |
e=0.0680 |
Start step (1c), ~1500 hrs 2/16 |
e=0.jpg) |
e=0.0674 |
End step (1b), 1015 hrs 2/16 |
e=0.0666.png) |
e=0.0666 |
0845 2/16. Looks like a smoking gun to me. We'll stop this in an hour or two for another unload/rebound cycle, then continue at same load. |
e=0.0654.png) |
e=0.0654 |
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e=0.0642.png) |
e=0.0642 |
0915 hrs 2/15. I see no drift whatever in edot in the past 24 hrs. |
e=0.0628.png) |
e=0/0628 |
2200 hrs 2/14. |
e=0.0615.png) |
e=0.0615 |
1015 hrs 2/14. Looks like we might be falling short of s.s. |
e=0.0596.png) |
e-0.0596 |
~2200 hrs 2/13, start of step (1b), including gearing change to 100:1. Not that much enhanced strain. We're waiting optimistically to see about s.s. |
e=0.0577.png) |
e=0.0577 |
end of step (1a), just a couple of hours later. Too bad edot had to dip there... |
e=0.0566.png) |
e=0.0566 |
0700 hrs 2/13. Steady edot ≈ 6e-8/s, just under 1%/day. Hard to see how this could be anything but s.s.; will rezero today, then keep going. |
e=0.0529.png) |
e=0.0529 |
2100 hrs 2/12. See where the 100:1 gearing went in. Except for this dip over the past hour, edot has been unchanged over the past 12 hrs. |
e=0.0491.png) |
e=0.0491 |
0845 hrs 2/12. Still have 10:1 gearing. |
e=0.0410.png) |
e=0.0410 |
~2100 hrs 2/11 |
e=0.0359.png) |
e = 0.0359 |
1630 hrs 2/11/08; got started 5.5 hours ago. 10:1 gears still in, so it's going quite fast and has covered the first 3.5% of strain faster than any of the rest. Still slowing, albeit slowly. |
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