How to Convert 2D faces into solid

Nafiseh · 2024-11-08T16:22:21+00:00

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Hello,

I have a question about converting 2D faces that I've extracted from 3D elements into a solid. I've tried using the FE Geometry option under Topology to convert the elements, but I'm facing an issue. When I convert each of the three phases (colors) into a solid one by one, parts of the same phase are getting assigned different colors. For example, while converting the green phase, some parts unexpectedly turn red.

Could you please help me with a way to convert each of these phases into solids one by one without this problem?

Thank you!

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Accepted answers

Prajval_cu

Yes you should start with Creating the faces for the 3D elements ,

Go to : Validate> Faces> Select the elements and create Faces.

Later you can create surfaces from the "from FE" tool, as I mentioned in the earlier chat.

The easiest way to check the weather the surfaces are closed volume is through

3D> Bounding tool > Find. If you just click "Find" Radio button on this tool, it will highlight the surfaces

if it makes a closed volume. This is one of the way to check and we have various ways too.

Regards

Prajval

Prajval_cu

Hypermesh has various functions to deal with Geometry edges and create Volumes.

user can rely on 2d> Surface repair functonality or under Topology you can use > Split/Stitch or Quick edit function to close the edges .

To Create a solid use 3D> Solids> Bounding function.

Regards

Prajval

All comments

Prajval_cu

Hi,

Could you share the model with us to have a look and suggest the best possible approach?

Nafiseh

Sure! here is a screenshot of the model.

Prajval_cu

To create solids from elements, you must first generate surfaces from the FE model

Go To : 2D> Surfaces> From FE ( select all the elements) > create.

This will create the surfaces. Now Make sure this surface created has the closed Volume in order to generate the Solids .

To create Solids from Surfaces

Go to : 3D > Solids> Bounding> Create.

I hope this is helpful.

Nafiseh

Thank you for your help.

The model was extracted from AVIZO and only includes 3D elements without geometry. Should I start by creating 2D faces and then create 2D surfaces?

Nafiseh

Furthermore, how could I make sure the surfaces are closed volume?

Prajval_cu

Yes you should start with Creating the faces for the 3D elements ,

Go to : Validate> Faces> Select the elements and create Faces.

Later you can create surfaces from the "from FE" tool, as I mentioned in the earlier chat.

The easiest way to check the weather the surfaces are closed volume is through

3D> Bounding tool > Find. If you just click "Find" Radio button on this tool, it will highlight the surfaces

if it makes a closed volume. This is one of the way to check and we have various ways too.

Regards

Prajval

Nafiseh

Thank you so much! I found that my model contains some open volumes. I created the material model using AVIZO software and reviewed all the modeling steps in AVIZO, which seemed fine. Do you know if there's a way to close these open volumes in HyperMesh to create a solid?

Thank you!
Nafiseh

Prajval_cu

Hypermesh has various functions to deal with Geometry edges and create Volumes.

user can rely on 2d> Surface repair functonality or under Topology you can use > Split/Stitch or Quick edit function to close the edges .

To Create a solid use 3D> Solids> Bounding function.

Regards

Prajval

Prajval_cu

Kindly refer the below Altair How To Youtube videos on Surface repair for your reference

https://www.youtube.com/@altairhowto/search?query=surface%20repair

Nafiseh

Thank you so much! The videos and the steps you mentioned were very helpful.

Nafiseh

I want to apply degrees of freedom to each surface of the model, but the constraints option is not active. Do you know why this might be?

Thanks

Prajval_cu

It is the active feature and user can just click on the Constraints GUI, which pops a new Window to create the constraints.

Nafiseh

I believe that in the previous version (HyperMesh 2019), there was an option to select the four nodes of a face, allowing the software to restrict the degrees of freedom for the specified surface. However, I couldn’t find an option to select faces in the current version. Could you please help me with how to achieve this? Additionally, the Constraints feature remains inactive when I attempt to use it as shown in the above image.

Thank you!

Nafiseh

Hello Prajval,

I am trying to export a list of solid elements along with their assigned nodes in the following format (as an example):

*ELEMENT_SOLID
$# eid pid n1 n2 n3 n4 n5 n6 n7 n8
1 2 2 32 5 4 4 4 4 4
2 2 2 29 32 28 28 28 28 28
3 2 4 32 31 28 28 28 28 28
4 2 2 4 1 28 28 28 28 28
5 2 2 28 32 4 4 4 4 4

Here’s what I’ve done so far:

Created solid elements from 3D elements exported from AVIZO.
Extracted 2D faces from these 3D elements.
Generated solids again from the 2D faces.
Created node set lists for all faces of the 3D model.

However, when I exported the .k file to import it into LS-DYNA, the file did not include the required solid element list as shown above.

Could you please guide me on how to fix this issue and properly export the solid element list in the desired format?

I attached the file for your consideration.

Thanks

3D model (copy).k

3D model (copy).hm

Prajval_cu

Hi,
Kindly rename the component name without the ^ symbol and also update the card image to "Part" and then export.

Regards

Prajval