# Topology optimization

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Hello! I am trying to optimizate a bellcrank for a formula student car and I am a beginner using Hyperworks. After doing some exercises from Altair Certification I am not able to do anything fine...

I have done a model and I want to do a topology optimization in order to minimize the weight. Theoretically, the holes shouldn't be modified. After running the Optistruct I cannot get any clear result... ¿Can anybody look at my model and tell me who I need to change/add?

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16 hours ago, msromero said:

Theoretically, the holes shouldn't be modified.

Yes, that's theory  But in your FEM, do you define as "non design" component?

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Hi,

You are applying load on nodes of the hole(s) and this will deform hole.

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On 14/4/2018 at 8:39 AM, Q.Nguyen-Dai said:

Yes, that's theory  But in your FEM, do you define as "non design" component?

I tried to, but I really don't know how to do it. Could you easily explain me how to do it?

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2 hours ago, Prakash Pagadala said:

Hi,

You are applying load on nodes of the hole(s) and this will deform hole.

Yes, I know it will be deformed. What I want is that the optimization doesn't delete the material around the hole in order to reduce the mass of the piece

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Hi,

You can include few of the elements around the hole in non-design space.

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1 hour ago, Prakash Pagadala said:

Hi,

You can include few of the elements around the hole in non-design space.

This problem is solved. Now what it is happening is that the holes are not conected with material. It is optimizated  with material between two holes, but the one on the top is like "flying". Do you have any idea what can it be happening?

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Hi,

From what you said, I understand that the holes are not connected with design space, correct?

You can use the Equivalnece option in Edges panel to connect them nodally. (Shift+F3) is the shortcut which leads to that panel.