cylindrical Triaxial test with stress controlled Cylic Loading

Hi Yogesh,

you can use http://woodem.eu/doc/woo.dem.html#woo.dem.WeirdTriaxControl and set the doneHook parameter to call your custom function once a desired stress level has been reached. In the Triax preprocessor, it calls compactionDone, and then triaxDone the next time. So you could do seomthing along those lines:

doneHook='myFunction(S,engine,0)' # set this as initial parameter of WeirdTriaxControl; engine is the instance of WeirdTriaxControl

def doneHook(S,e,i):
   # change doneHook to call with incremented step next time
   e.doneHook='myFunction(s,engine,%d)'%i+1
   # change the target stress depending on i
   e.goal=...

The disadvantage of WeirdTriaxControl is, as its name suggests, that its feedback algorithm is a bit weird - it depends on the "mass" parameter, as you might have already noticed (which is not even mass in the physical sense); if there were some more reasonable algorithm available, it would be nice.

An idea I had was to modify WeirdTriaxControl to something similar to LawTester, which takes a number of LawTesterStage objects, which describe what is to be reached in each stage; this way you can generate cyclic loading - see e.g. in examples/law-test-pellet.py (you need to delete the sigConfine=..., that is an older parameter; I will fix that) or examples/law-test-hertz.py . Would that be useful?

Do you use the Triax preprocessor? Perhaps if you need to experiment and tune by hand, you might be better off to use a plain script instead of modifying the preprocessor, though it is up to you.

Cheers, Vaclav