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[vagelan]

Hi

I have a question related to lattice optimization in Ansys.

Do the lattice optimization use homogenized material properties or do we have to use the Material Designer in order to assign them in the topology optimization tool?

In other words:

The geometry that we get from the lattice optimization and we use it further at i.e a static analysis, does it use the homogenized young modulus or do we have to find it via the Material designer?

[Sandeep Medikonda]

When you perform Lattice Topology Optimization and you are using the optimized geometry in a design validation study, you are still using the original material properties. But please note that meshing and analyzing the topology lattice optimized model can be time-consuming due to the smaller lattice features. Note, that once you perform lattice topology optimization you would have to take it to SpaceClaim and use density attributes under the facets>shell tab to generate the lattice structure. See the help on doing this.

Now, there is a way to use Material Designer to generate the homogenized properties and use it along with an external model to analyze your structure but this is an involved process however it might save time in comparison to analyzing a lattice structure by itself.

So, the short answer to your question is you don't have to use material designer but you might want to.

Regards,
Sandeep
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[vagelan]

So when i choose 'density attributes' and use the optimized geometry in a validation study the material properties of the model, after meshing, are homogenized?

What type of mesh for lattices can you suggest for better results?

PS. Why the choice of 'density attributes' is not available at the 2d lattices like honeycomb? How can i use the optimized design in this situation and validate it?

[Sandeep Medikonda]

No, when using topology optimization only the structure is optimized.

This optimized structure might also be represented by equivalent material properties in continuum mechanics/FEA domain. This is mainly done as it would be computationally very expensive to validate a lattice structure in FEA. This is where material designer comes into the picture. Read this post.

Note that for validating lattice structures Discovery Live might be a better option.

I don't think you can use any other mesh other than patch conforming or patch independent tet mesh as many of the features might be hard to capture with hex elements.

[vagelan]

Is this Project Schematic correct then?

Why also do we have only 7 lattice-choices at the lattice topology optimization and more at Spaceclaim? Do we need to use the same lattice type both at topology optimization and at Spaceclaim? If yes which procedure can we use to assign the other lattices?

[pdurgaprasad2690]

Hi sandeep,

Need your support in Contact Analysis,

i want to simulate compound cylinders and would like to see contact pressure developed due to interference, no force applied.

will you please help me?

i have modeled 3D quarter model of compound cylinders.

i am confusing with boundary conditions where i have to give frictionless support and fixed support

and it is asking for structural load at least one.

Help me in this

any suggestion is appreciated

Thanks 

Durgaprasad