Yade

Calculate the induced stress

Asked by Yor1

Hello

I want to calculate the increase in stored energy Uc.

Uc=0.5*strain_rate*stress_induced*volume(sample)+strain_rate*stress_previous*volume(sample)

To apply the stress on the sapmle i use TriaxialStressController.
To calculate stress_induced i use this formula
stress_induced=stress(k)-stress(k-1) with k is the iteration number.
In the script i get stress(k) with "stress"
https://yade-dem.org/doc/yade.wrapper.html?highlight=triaxialstresscontroller#yade.wrapper.TriaxialStressController.stress
and i get stress(k-1) with "previousStress"
https://yade-dem.org/doc/yade.wrapper.html?highlight=triaxialstresscontroller#yade.wrapper.TriaxialStressController.previousStress

The problem is previousStress=0 during the simulation wheras in the reality the previousStress >0.

Best regard
Jabrane

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Bruno Chareyre (bruno-chareyre) said : 		#1

My suggestion is (assuming the triaxial engine is labeled "triax"):
triax.externalWork
It is accumulated when iterating.

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