Yade

strain in PeriTriaxController

Asked by zhou qian

Hi:
I use the peritriaxcontroller. My init cell size is 1.6e-3*vector3, containing about1000 spheres. dt is about 2.e-6.
my goal is
first step:
(1.e-5,1.e-5,1.e-5),mask=7,
second step:
(1.e-5,1.e-5,currentstrain-0.003),mask=3

however, if I set the goal:
first step:
(1.e-5,1.e-5,1.e-5),mask=7,
2th-4th step:
(1.e-5,1.e-5,currentstrain-0.001),mask=3

The final goal is the same, and I checked PeriIsoCompressor.cpp, I think the strain rate is also the same (except the last step), but the stress is different. Changing strain 0.001, and the stress(z axis) is more stable and relatively smaller than 0.003.

Why the result is different?
Yours,
Joe

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zhou qian
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zhou qian (zhoug15) said : 		#1

sorry I think it's a ridiculous question. because in the 0.001 example, the cell was stabilized 3 times while in 0.003 condition it was stabilized only 1 time and the error accumulated.