Good morning I'm trying to do a simple optimization of a connecting-rod with:
- material: E= 1,2e+11 poisson=0.3
- I have create a point in the centre of the big hole of the connectingrod, all the nodes of the internal surface of the big hole are connected to the central node with RB2 elements, then I have applied to the central points a constraint that constraints all the 6 degrees.
- I have applied a force of 4000N on the internal face of the little hole of the connecting-rod
- I have imposed an optimization constraint on volume with upper bound of 0,5
-The objective function is the minimization of the compliance
When I do the check of the optimization, it return me the error messagge:
ERROR # 150 FROM SUBROUTINE prepopt2
Invalid Volume or Mass Constraint.
The response type is the total VOLUME
the upper bound value = 5.000000E-01
the total volume = 8.761313E+04
the design volume = 7.718574E+04
the total mass = 0.000000E+00
the design mass = 0.000000E+00
***** FATAL OPTIMIZATION ERROR *****
I don't understand if the problem is caused by the properties of the material, the constraints or the force.
Can you suggest me how try to fix the error?
