Fix ply thickness for free-size optimisation

Chris84

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.

 

 

 

 

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.

 

 

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?

Adriano_Koga

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.