Composite size optimization / Composite failure
Altair EmployeeDear all,
I am trying to run a composite size optimization. I want to find the optimal thickness of each ply I have created in my laminate.
My model consists in shell elements. I only have created one laminate that have multiple plies.
I want to optimize each ply thickness. I tried with the 'ply thickness' and PTMIN and PTMAN but did not work (minimize mass subjected to displacement). No iterations are run and it just gives me the results of a normal FEM analysis. Any idea why? Or how should I do it?
Second question..I inserted the control card 'global output request' CSTRESS CSTRAIN CFAILURE. The first two work fine, but I can not see the results of Composite Failure after the FEM analysis. It just gives me all value of 1.
Any suggestion on how I can see the failure results of the composite?
Thank you very much!!!!
Answers
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Hi Mike,
For 1st question, can you if Optimization is turned ON in OptiStruct panel under run options (see the image)?
<?xml version="1.0" encoding="UTF-8"?>
For 2nd question, please check whether failure criteria is provided in property card or not. A valid failure criteria is necessary to calculate failure index and strength ratios like TSAIWU, etc...
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Hi Prakash,
How do I provide failure criteria in the property card?
For first question..yes I do that. But I don't understand why is not working.
Is correct the procedure? I create a laminate with different ply. How is the best way to optimize the thickness of each global ply (and not of each element)?
Thank you a lot for your answer
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Hi Prakash,
I have attached the images of my panel and of the design variable I created in 'Composite Size'.
Does it look correct?<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
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Hi,
You can specify failure criteria in PCOMPP>>FT. You will see a selection menu where different failure criteria are listed. Select your choice and try.
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Hi Prakash,
Yes thank you I have find that.
Any idea for the optimization??
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Hi Mike,
DId you change the analysis option in OptiStruct panel to Optimization?
If possible, can you share the .out file?
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Yes I did. The .out file says that no design variables are found.
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Mike,
Can you share the model file using Filetransfer link in my signature?
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Yes done it!
Thank you for your time!!!
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Hi Mike,
I see you have created Design variable for laminate and not for plys.
Goto Size panel in optimization page and create design variables for plys and try again
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Hi Prakash,
Thank you for your answer.
So in 'Composite Size' I have to select PCOMP as type and not STACK?
I have a PCOMPP card right now. I can not set this property in the PCOMP type.
Can I run it using ply based composite?0 -
Mike,
What you did is not wrong. But apart from that you need to defines plies as design variables.
Right now what you have is plies and laminate which is a ply based model and it is perfectly fine.
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Altair Forum User said:
Mike,
What you did is not wrong. But apart from that you need to defines plies as design variables.
Right now what you have is plies and laminate which is a ply based model and it is perfectly fine.
Hello,
I am getting the same issue i have a model in which the plies are already created so i want to skip the free size optimization and would like to do directly size optimization. I am not sure how to start second step directly. What i have to give in the design variable? I have tried but it says No design material or design variable found. analysis only
If you have any idea please help me out.
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