Elmer Discussion Forum

Ok, the stress-strain curve is known. From the solver's point of view, I think the solution should be obtained with some iterations using the Newton-Raphson method starting from an initial guess as occurs in electromagnetic problems with nonlinear ferromagnetic materials. I'm not talking about Elmer...

Hi, thanks for your answer. Good to know that a piecewise curve can be used. Actually, what I would like to know is if, in 2d-plane stress, the relation between stresses and strains is still the equation below with only the exception that E is not constant but depends on strain values. [sigma] = E(s...

Hi, I'm very interested in this topic. In particular, my case study is a rotating plane disc of steel subjected to its centrifugal force only. Which is the mathematical formulation behind the bi-linear material solver? I know how the elastic solver works and its formulation. However, I don't know ho...

Thank you very much, I'll try to understand them.

Hi, Even though this is an old topic, it is very interesting for me. I would like to perform some structural analysis on 2d geometries (e.g. hollow disk) with nonlinear material law (stress-strain curve). Do you know if it is possible to run such an analysis with Elmer? If yes, could you suggest to ...

Thank you for your feedback.

FEMM uses only first order elements.
I noted that the accuracy of the torque waveform strongly depends on the mesh quality within the air-gap.

I will follow your suggestion in future analyses.

Best Regards

Cristian

Thank you Peter for your interest in my issue and for your advice. I tried your code and the solver is way faster. However, as you already observed, there are warning messages as Requesting time from non-existing timer: PeriodicProjector and Tvals too small I look forward to hearing more information...

Hi all, I've been a FEMM user for a long time. I'm trying to implement transient simulations for a simple reluctance motor with salient rotor, to understand how Elmer works. FEMM does not allow transient simulations, but I study the rotor motion with a series of magnetostatic simulations. The FEMM f...

Thank you Takala,

Now I've got what I need. I will try to test other more complex circuits.

Hi all, I'm trying to run a transient simulation with a simple C-core model (all the scripts are attached). I obtained good results with the series connection of the 2 FEM components. Now, I want to realize the parallel connection between the 2 FEM components. I tried to write the circuit code but t...