Is there anyway to make a very high elastic modulus mesh body as a rigid body?

Tuan Nguyen over 6 years ago

I have a model with many high elastic modulus mesh bodies which can act as rigid bodies.

Now it is very slow to solve.

I suppose by transforming them to rigid body that way could make the solving much faster.

Is there anyway to make them as rigid bodies?

Thanks!

0 Kiranraj Shetty over 6 years ago

Dear Tuan Nguyen,

Yes. You can model them as rigid bodies.

You can either define them as "meshed rigid" contact bodies -There will be no deformations (Infinite Stiffness) & no structural properties required in structural analysis.

Or you can use the geometries for these bodies and define them as "rigid" contact bodies.
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0 Tuan Nguyen over 6 years ago

Dear @kiranraj shetty

Thank you for the prompt answer!

Come to my real model, you would know those "meshed rigid" contact bodies can:

1. make a contact between them as normal mesh bodies in term of I can know how much contact force they are between them and at which position?

2. connect with other elements? (Can they share nodes with other normal elements)?

It would be great if there is an example ? (I might not be able to find in the default Marc examples)

Much appreciation!
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0 Kiranraj Shetty over 6 years ago

Dear Tuan Nguyen,

I have created an example here for your reference. Contact force output is available, you can check in attached example.

Meshed rigid body can share nodes with other elements. You can play around with attached sample.

If you already have the geometry for these stiff bodies, you can define them as geometric bodies.

Regards,

Kiran

Attached Files (1)

model1.mud.zip
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0 Tuan Nguyen over 6 years ago

I tried your model. So the case is that a deform-able meshed body making contact with solid meshed body.

What I'm wondering further is that whether the solid meshed body as you ad viced can make contact with other solid meshed body or not.

In my case I have likely-solid bodies which share nodes with other soft elements and those "solid bodies" will make contact to each other.

Sorry I couldn't know how to play with your example due to my limitation using Mentat (I'm mostly go with Marc interface in Patran).

Thank you!
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0 Kiranraj Shetty over 6 years ago

Meshed rigid can come in contact with other meshed rigid body. Check attached model.

Attached Files (1)

mesh_rig_mesh_rig.mud.zip
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0 Tuan Nguyen over 6 years ago

Good day @kiranraj shetty

After playing around with rigid meshed bodies,

In the first model, the thing is that the rigid body can not transfer force when it was sandwiched between 2 deform-able bodies

or in the situation that force from deform-able body over the rigid body to other rigid body, aren't they?

In the second model, the rigid body look like a fix body to the ground

Please confirm that, attachments here are the models.

Thank you!

Attached Files (1)

meshedSolid.zip
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0 Kiranraj Shetty over 6 years ago

Hi Tuan Nguyen,

As I mentioned earlier, Meshed rigid bodies will have infinite stiffness. Hence you cannot expect to see any deformation / displacement in this body under loading.
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0 Tuan Nguyen over 6 years ago

As in the article simcompanion.mscsoftware.com/.../index

I tried to make one body as load control body, but I got Exit number 2011 " Errors encountered during application of TYING equations.

Printout indicates specific problem."

@kiranraj shetty Would you mind telling me what is the problem here? Thank you!

Attached Files (1)

model1.mud.zip
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0 Kiranraj Shetty over 6 years ago
Find the attached working model.

The nodes defined for control node should not be part of any other mesh / contact body.

Meshed rigid or geometric bodies will always be master in node to segment contact.

Hence I removed the intermediate meshed rigid body. Now you can see the meshed rigid body "lower" moves due to the free control node as explained in the article.

Attached Files (1)

2011.mud.zip
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0 Tuan Nguyen over 6 years ago

Thank you for your promt answer!

Just one more question in case of loaded meshed rigid body contacting to loaded meshed rigid body, is this posible and how to describe in contact table (is this segment to segment or must be node to segment? )
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