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No feasibility after ply shuffling optimization

Hi everybody,

I have problems reaching a feasible design at the last stage of the ply optimization. I am trying to minimize the displacement during the shuffling of the plys. After the first iteration the solver stops without a message in the Message log, if it is feasible or infeasible.

Did anybody had the same problem or can help me with this topic

Kind regards

Dean

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Altair Forum User

Hi Dean,

Do you see any error or warning message at the end of the first iteration?

Altair Forum User

Hi Prakash,

thank you for your reply. I Have attached the output_file so you can see yourself. The only warning message I get during running the optimization ist :

*** WARNING # 1569
for element id = -10003.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.

What I am wondering about is that I had stacking optimiaztions with the same warning message, that ended in a feasible solution.

I hope you can help me with this one

Kind regards

Dean

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