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optimization of a carbon fiber laminate

Hi! I want to know how is possible to optimize the thickness and so the number of plies of a carbon fiber panel.
This model concern in a sandwich panel made plies of M46J and an honeycomb core. My goal will be optimize only the two laminates of carbon fibers, not the core.
please give me an help!
Thank you

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Simon Križnik

Hi @antonio.dortona95

There is a three stage process for composite optimization: free-size, size and shuffle.

Please go through following videos

2017 Winter Directed Learning Webinar Series – OptiStruct for Composite Analysis & Optimization - Altair University

antonio.dortona95

Thank you very much @Ivan for your answer. The error was the unit of mass measurement so the solver didn't reach a significant solution.