Composite Shuffle Optimization with plys not in 45 -45° angle
Hey all,
currently I am working on a composite optimization process that involves no 45 and -45° plies.
What I experienced was, that with the step 3 (shuffle optimization), optistruct did not consider my constraint of maximum ply successor. Is this a knows issue?
Additionally, why can't we define pairing constraints between other plies than the 45 and -45° ? Is there a physical reason why you would do that just with 45 and -45 ?
Thanks and best regards /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />
Merula
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Sure. .out attached... we noticed that the constraint was violated, so we increased it to see if it would have any results...
I attached the .html as well for you to see what changes with every iteration...
Unfortunatly I cant share the .fem file.
Thanks Prakash.
Altair EmployeeHi @Merula
Optimization finished in two iterations and from .out file I couldn't find anything.
Is it possible to share the model file?
I will create an academic example I can share, which I will send to you shortly. Thanks
As promised, here are the files.
Altair EmployeeHi @Merula
If you look at the stack after shuffling, only 0, 90 plies followed MAXSUCC rule but rest were ignored (0, 60). This is intended. The current mechanism accepts only 0/90/45/-45
Developers are already working on in to make a more robust optimization tool.
as far as I understood this, maxsucc is a constraint from manufacturing side... Why is it limited to 0 90 45 -45 ? Is there a physical reason for this or just a TODO in the feature list?
Best regards
Altair EmployeeWell, maybe this how it was programmed at the beginning. Proposed, In next version shuffling with MAXSUCC constraint will support all angles.
Thanks for this clarification. Looking forward to this update.
Altair EmployeeIs this still the case in Altair 2019 (Optistruct 2019) i.e. if I have a stack with -30/30/90 plies will it ignore the MAXSUCC constraint completely and not be able to pair +/-30 plies?
Hi @Merula
Could you please the .out file of shuffling part?
Pairing 45 and -45 reduces in-plane shear stress.