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Cohesive elements artificial stabilization

Altair Forum User

Hi,

I am working with radioss solver for adhesive modelling.

Material model MAT/LAW83:

Alpha: -100

Beta: 1

SN connect Failure model:

Fct_0N:4 , Fct_0S:7, Fct_FN:90, Fct_FS:16

Alpha_0 : 50, Alpha_F : 50, Beta_0_F:2

The force vs. displacement graphs when working with KSII-90° and KSII-peel simulation models is showing a significant variation in output.

Please find the graph attached, BC -000111 artificially applied to cohesive element nodes.

The observed graph with BCs are similar to my experimentation results, does that mean I need to always apply BC 000111 to cohesive elements?

Any explanation on why this is happening, could be of great help.

Regards,

Chaitanya

Master's student

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Altair Forum User

Hi Chaitanya,

From my understanding you applied a boundary condition to cohesive element nodes, that is transalational dof were fixed. And then, the simulation data was matching with experimental data. Please correct if I'm wrong.

Altair Forum User

Hi George,

No,

translations in X,Y & Z are free

Rotations along X,Y & Z are constrained.

Altair Forum User

Hi Chaitanya,

I'll check regarding this and will update you very soon.

Altair Forum User

Hi Chaitanya,
Please share the model files (before applying BCs and after applying BCs) through the secure file transfer link available in signature, so that we will check and update.

Altair Forum User

Hi,

Received your files and we are working on it. We will update you soon.

Altair Forum User

Hi George,

Any progress regarding my model ?

Regards,

Chaitanya

Altair Forum User

Hi Chaitanya,

The behavior seems to be strange as nodes of solid elements used for the cohesive layer do not have rotational DOFs. I have reported the same to the development team and waiting for their suggestions. And i'll update you the developments.

Altair Forum User

Hi George,

Did you get some update from development team?

Warm regards,

Chaitanya.

Altair Forum User

Hi Chaitanya,

This is reported and if they find any issues related to this, they will fix it up in the next update. Meanwhile we will also recheck the model.