DummyPlate E-modulus of Mohrcoulomb Eref or Eoed

Whichever you like!   Just don't forget to divide the E to a high value like 1E6, and multiplying the resulting force with the same value. Right now, it seems like you have used the actual E, not the dummy E. Read here: communities.bentley.com/.../composite-liner-approach-in-plaxis-2d

Hi Demir

Thanks. Of course I reduced the stiffness by factor like 1E6.

I don't agree that the engineer can just choose whichever he likes.

Probably it depends on the case, if the E or Eoed is the right E-Modulus.

But in my case: If I assume, that plaxis uses for the calculation of the deformations more or less E instead of Eoed (because the stress state is more dominated by E instead of Eoed), then I should use E for the dummy Plate. In the other way, like you mentioned I can chose Eoed, the structural forces by the dummy plate would be 10% to low.

Hi Demir

Thanks. Of course I reduced the stiffness by factor like 1E6.

I don't agree that the engineer can just choose whichever he likes.

Probably it depends on the case, if the E or Eoed is the right E-Modulus.

But in my case: If I assume, that plaxis uses for the calculation of the deformations more or less E instead of Eoed (because the stress state is more dominated by E instead of Eoed), then I should use E for the dummy Plate. In the other way, like you mentioned I can chose Eoed, the structural forces by the dummy plate would be 10% to low.

Regarding stiffness factor: I commented on the value I saw - 44 GPa seems unreduced to me, just to give you an heads up, but glad that you are aware of that.

Regarding E and Eoed, I am not talking about using different values, I am talking about Plaxis' implementation. If you enter E', Plaxis will automatically calculate Eoed. If you have the Eoed, Plaxis will calculate the E'. So, whichever you choose, does not matter. The only thing we have to do is entering the correct value to correct place.

Deciding on which one is correct value for (let's say) concrete, is engineer's judgement. I personally would go for E', but one can argue the otherwise.