CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   OpenFOAM CC Toolkits for Fluid-Structure Interaction (https://www.cfd-online.com/Forums/openfoam-cc-toolkits-fluid-structure-interaction/)
-   -   title : Question regarding multi-material simulation (https://www.cfd-online.com/Forums/openfoam-cc-toolkits-fluid-structure-interaction/223561-title-question-regarding-multi-material-simulation.html)

brunomramoa January 16, 2020 07:08

title : Question regarding multi-material simulation
 
1 Attachment(s)
Hello to all solid4Foamers,

Currently, I am doing a simulation of a bimaterial specimen deforming on a plate. The specimen is composed of a very soft material with a very hard insert [more information regarding the mechanical properties bellow].
The case is defined below:
https://i.imgur.com/G41GWcR.png


The definition of the materials was performed via topoSet [OpenFoam v1906] using the stls of the geometry.


"To create movement" I am setting a patch on the top of the specimen with a fixedDisplacement time series to move the foot 5mm along the negative y-direction.



The mechanical properties are defined with a neoHookeanElastic behaviour and a nonLinearGeometryUpdatedLagrangian solidModel. When I set the material properties of the specimen and insert to be the same, I get a complete simulation. As soon as I set them to have their respective properties, the simulation stops shortly after starting. They have a ~3 order of magnitude difference in their modulus.



I will post the dictionaries bellow.


My question is:

How can I handle this type of simulation with multi-material? Do I need to set an intermediate layer to reduce the gradient of the mechanical properties? Does solids4Foam have anything implemented in this regard?
Does anyone have any experience with multi-material simulations?








pedroavr92 January 29, 2020 05:40

Hello Ramoa,

That is an interesting question, indeed...
I am also trying to simulate some multi-Material cases and I am having problems when I set up two materials with a huge difference in elastic modulus (steel and rubber).

It would be great if someone could give some insight into this issue...

best of luck =)


All times are GMT -4. The time now is 07:53.