Learning Forum

[Ayeon Hwang]

I have a question about the workbench(static structural).

As shown in the picture below,
the inner geometry is separate from the outer geometry.
I want to make the inner geometry move inward.

Do you know how to do it?

Thank you.

[Sampat Kumar]

Hi Ayeon Hwang, 
Will you please explain the question in a little bit of detail? As I can see, the inner geometry is separated from the outer geometry in the first images. Are you expecting any radial contraction of the inner part of the geometry? Are you expecting the inner geometry to move opposite the movement in the attached image? It all depends on the boundary condition that you have applied.

Regards, 
Sampat

[Sampat Kumar]

Hi, 
It all depends on the geometry and boundary condition that you have applied. Will you please upload a screenshot of the original geometry and boundary conditions that you have applied? 

Regards, 
Sampat

[Ayeon Hwang]

I made two solids in spaceclaim.
And I used the static structural function in workbench.

I don't know how to set a boundary condition here.
I've tried it on Fluent.

The two geometry have different properties.
I want the inner geometry to expand.

The initial geometry is shown in the picture below.

How can you solve it?

 

And when I changed a function, the bent shape did not come out, and it only looks like the shape below.


Please help me

Thank you.

 

[Ayeon Hwang]

I designated 'displacement' and 'fixed support' like this.

Details are attached.

 

[Sampat Kumar]

Hi Ayeon , 
Will you please check the connection that you have applied for? Please establish contact between the two parts. Are you seeing the result on a large scale? I would recommend you see the result on a true scale.

You can adjust the pinball radius to detect the contact between the inner and outer geometry. You will find the pinball radius option in the contact details. You can also check the status of the contact by using the contact tool.

Regards, 
Sampat

 

[Ayeon Hwang]

Hello.

Thank you for your answer.

I have already met the conditions.

But nothing has changed.
I changed it to Frictional, Frictionless, and no separate, but the result is the same.



Is there any other solution?

 

 

The inner geometry was defined as stent and the outer geometry as artery.

I want to see the effect of stent on the artery.

But my simulation result is that stent goes out of the artery.

The elasticity of stent was expected to inflate the artery.

How can I solve this?

 

Thank you. 

[Sampat Kumar]

Hi Ayeon,
I have performed a similar operation on a dummy model. I am able to see the impact of the expansion of inner geometry to the outer geometry.


I would suggest verifying the following points
1. Contact status- If the pinball radius is more than the geometric gap or not, if not then increase the pinball radius. right click in the connection –>Contact tool–> generate the contact information. 
2. If the applied pressure is enough to expand the inner geometry for making contact with the outer geometry in the true scale. 
3. Plot the separate deformation for the outer geometry and inner geometry to see the deformation in both parts. 
4. keep large deformation ON in the analysis setting. 

Regards, 
Sampat

 

[Ayeon Hwang]

I'm using the 2020 R1 version.
But the 2020 R3 version is also available.

Can I know what's wrong with my work?

 

 

Thank you

[Sampat Kumar]

Hi  Ayeon,
Will you please tell me the issues in detail? Where is it available? Or you can post this in the separate forum question so that this forum thread would remain separate for your model-specific and problem-related contact and boundary condition. 

Regards, 
Sampat

 

 

[Ayeon Hwang]

I did what you said, but I think I'm doing something wrong

Can you check my workbench file? I give you a link.

      >>  https://drive.google.com/file/d/1w-2-RpQeCO8ftRC7pvpprdcRqe35a87S/view?usp=sharing

Is there a problem with this warning?

 

And when 'contacts' was 'no separate', this shape came out.

 

Is it because the geometry is not flat?

 

thank you. 

[Sampat Kumar]

Hi Ayeon, 
We Ansys employees are not allowed to handle any external links or files; maybe someone outside of Ansys would help you with this file.
Your model has converged with your loading and boundary conditions. The solver has automatically added a Weak spring to converge this model.
What type of result do you obtain when you use frictional contact instead of no separation contact?

Regards,
Sampat