New question #660034 on Yade:
https://answers.launchpad.net/yade/+question/660034
**,Hello Mates,
I have been trying to simulate a triaxial test on the granular (Sand) material.
The aims are:
Try the sample with a certain set of properties and Apply the triaxial
confining pressure by means of strain-loading (that is, load sample with a
certain strain rate to induce a certain confining pressure).
Then, plot the Stress-strain curve and Volumetric curve based on ENGINEERING
STRAIN (%). However, I really do not know how can I modify the Saving variables
section to get engineering strain (%) directly from YADE ( sample size is
90*109*90mm).
I really appreciate it and let me know how can I do that.
The current "function saving variables" is as follows:
#from yade import plot
### a function saving variables
def history():
plot.addData(e11=-triax.strain[0], e22=-triax.strain[1],
e33=-triax.strain[2],
ev=-triax.strain[0]-triax.strain[1]-triax.strain[2],
s11=-triax.stress(triax.wall_right_id)[0],
s22=-triax.stress(triax.wall_top_id)[1],
s33=-triax.stress(triax.wall_front_id)[2],
i=O.iter)
if 1:
## include a periodic engine calling that function in the simulation loop
O.engines=O.engines[0:5]+[PyRunner(iterPeriod=20,command='history()',label='recorder')]+O.engines[5:7]
##O.engines.insert(4,PyRunner(iterPeriod=20,command='history()',label='recorder'))
else:
## With the line above, we are recording some variables twice. We could in
fact replace the previous
## TriaxialRecorder
## by our periodic engine. Uncomment the following line:
O.engines[4]=PyRunner(iterPeriod=20,command='history()',label='recorder')
O.run(100,True)
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