Elmer Discussion Forum

Thank you again for all your work on this. I now get the updated equation simulated_radius - 1 = + strain_load / (1 + strain_load - pre_strain) Honestly I don't really know what we're aiming for. What is your test to know if it's working correctly? For example, without any documentation I don't know...

Hm, you're right, "Pre Strain" does have an effect on the simulations, but I can only see it when stress load is active too. I've been playing with isotropic deformations of the unit disk because it's easy to track numerically and analytically (displacement of the perimeter is the same mag...

Ok, thank you for looking into it.

So Material Pre Strain/Stress are only valid options when Eigen Analysis = True, otherwise BodyForce Stress/Strain Load should be used?

@mika, thank you for your help so far, it is very useful to have the documentation updated. I'm afraid I still can't find any combination of options which enables the Material "Pre Strain" or "Pre Stress" options to have any impact on the simulation. It appears that this question...

Coincidentally I have wanted to ask a very similar question. I have a different minimal example but the same observation: the only method for applying pre-stress/pre-strain in the StressSolver is to use "Strain Load" or "Stress Load" in a "Body Force". I'm happy to shar...

An update added by juharu has fixed the bug. There was an uninitialised parameter being used in part of the Mortar Boundary code. To be precise, this line: https://github.com/ElmerCSC/elmerfem/commit/fa05cacb836366f8b4322ad239bba42aaadf0f84 Now when I update to the latest version (latest git or late...

Hi kevinarden, Thank you for having a look. My reason for calling this a bug is that different builds of Elmer do not experience any crashing. I have a friend with an older version of the ppa installation ( https://launchpad.net/~elmer-csc-ubuntu/+archive/ubuntu/elmer-csc-ppa ) which has not crashed...

I've recently been playing with a particular mechanical simulation problem and found a surprisingly broad spectrum of behaviours. I've run the attached example 8 times this morning and had: - 5 successful executions - two overflow/underflow errors with the message "Norm of solution appears to b...

I have been playing with some contact mechanics in Elmer but feeling like there is something I'm missing. My experience so far has been that results often look a bit suspicious and can be quite fragile with lots of failed simulations for one reason or another. I'm hoping someone on this forum might ...

For completeness, here is a set of test cases which I think demonstrates the full behaviour: test.zip A quick summary, the physical setup is that there is a disk inside an annulus where the inner boundary of the annulus exactly matches the boundary of the disk. The sif file attaches an outwards forc...