Fix ply thickness for free-size optimisation

Chris84
Chris84 New Altair Community Member
edited October 2020 in Community Q&A

I'm trying to set up a free-size optimisation with a fixed thickness for two layers. They're basically the cover of the part and it's a woven fabric modeled with two unidirectional plies, which are constant. The thickness of each half is 0.125, exactly half of all the other plies.

I've already tried it with a PLYMAN constraint set BYPLY with a PMMAN value set for each ply with a constant option for the thinner plies.

 

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I've also tried the PLYMAN constraint set for ALL with a PMDIS value of 0.25, PMOPT BYPLY (What does this option even do?) and the PMEXC option set to CONST.

 

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My goal was to get a fixed thickness value for all of the plies, which I also got, but the plies I set to 0.125 mm didn't keep theirs.

What am I doing wrong?

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited August 2020

    Usually I would activate the CONST field, and use BY ANGLE option. In these cases I assing a very atypical angle for these plies that i want to keep untouched.

    Lets say for a honeycomb I've assigned 0.1 degree orientation. Then I go to CONST and keep all the 0.1degree with constant thickness.

    For the woven you could do the same. Use a 90.1 degree orientation and keep 90.1 with constant thickness.

     

    PLYMAN is for manufacturability and will only be used later on for sizing purposes.

  • Chris84
    Chris84 New Altair Community Member
    edited August 2020

    That didn't do it...

  • Chris84
    Chris84 New Altair Community Member
    edited August 2020

    Found my really stupid mistake. Seems like the thickness defined in the CONST constraint doesn't overwrite the one set to the ply in the first place. Mine was set to the wrong value all the time ....

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