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Topic review (newest first)
Dear Jose Jimenez,
I recommend to first check the Interface material parameters. We recommend to start with the recommendations from ATENA Troubleshooting, 2.2.14 I have problems when using the Interface (GAP) material on contacts.
If you still have problems, you can follow ATENA Troubleshooting, 2.1.1 to send us your model etc. such that we can help you find an efficient way of modelling.
In general, I do not think combining Interface elements with a layer of another material, both representing the contact, can be a good idea - you would need to make sure these 2 things represent each some aspect of the contact, and there are many parameters to be guessed...
I'm trying to make a 2D model of delamination between concrete and FRP. I would like to concentrate most nonlinear behavior on interface elements so I can calibrate them, however when using Sbeta material for concrete I get cracks in the zone immediately next to the interface elements.
I have noticed that by surrounding the interface elements with concrete modelled with Drucker Prager constitutive I avoid getting cracks, however I don't know if it's correct to model the same concrete with two different constitutives. Is there any way to avoid cracks and stress concentrations on Sbeta material?