Carbon-Fibre-Sandwich

Altair Forum User

Hi all,

 

i want to do a topology optimisation of bending a carbon-fibre-sandwich-Panel. The carbon-fibre-plies are modeled as a solid. between them is another solid, the core-material. (see at the Picture)

When i run the optimisation, error 312 occures:

 

*** ERROR #  312 ***
  In static load case            3
  the compliance is negative or large   3.127970E+11
  Optimization/buckling analysis cannot be performed
  due to possible rigid body mode
  FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED).
 
 

can anybody tell me what i'm doing wrong?

 

Thanks for your help,

andi

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Altair Forum User

Hello,

 

large compliance means mostly, that there are still rigid body modes possible (not enough constrained model).

Also take a look at your material properties.

 

Regards,

Mario