Hello,
My model consists of two parts, where an inner geometry made of C3D8 solid elements is embedded inside an outer cube which is also meshed with solid elements. The constraint given is "Embedded" elements.
Both materials are elastic-isotropic, however, the material for the inner geometry has a young's modulus of 112e3 GPa, whereas the outer cube (basically rubber) has E = 4 MPa.
I am running a displacement-controlled Abq Standard analysis, with NLGEOM on.
The model is at least 3 mm in length and width, however the max displacement I am getting is less than 0.2 mm after which it fails to converge.
I tried to mesh the outer cube with C3D8R along with Enhanced Hourglass option turned ON. Still facing convergence issue and getting hourglassing.
Any ideas on how I can improve my model? Thank you!
You are using reduced integration formulation. You can try with ticking off this option in element type.
If bending is relevant (can't judge from the figure), it will probably be best to switch to quadratic elements.
Hi Jonah ,
What is the Poisson's ratio attributed to the rubber-like material?
If it is greater than 0.485, the element formulation has to be changed to the hybrid formulation.
Quasi-incompressible materials (Poisson's ratio close to 0.5), such as elastomers, can exhibit volumetric locking (it seems to be the problem in your case) when the conventional formulation is used.
You can change the element formulation in Mesh module.
Best regards,
Caiuã.
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