Snap Fit Analysis

Hello,

I am doing snap fit analysis for Bottle Cap Contact. I want to check force required for capping of bottle. I used assembly of bottle neck and Cap meshed with Tetra mesh. I used Type 24 Contact, Mat Law 36 for Material and P14 Solid for property. I run the analysis. But the results are not satisfactory. when the cap is forced to fit into neck, Neck deformation seems very high as compared to practical one. Neck deformation looks like waviness which is not practically possible. Capping force is also very high. Almost 1400 N. I think there is mistake in my model. Please help me.

I attached video to observe neck behavior.

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Altair Forum User

Hi Harsh,

Instead of making the whole cap component as rigid, create a rigid on the top surface of the cap and impose the load on master node of the rigid body. Please try with this.

Harsh2610

Hi Harsh,

Instead of making the whole cap component as rigid, create a rigid on the top surface of the cap and impose the load on master node of the rigid body. Please try with this.

Hello George,

I will Try it.

Thank you.

Harsh2610

Hello,

In my simulation. I used Type 24 Contact interface. Master Surface is bottle and Slave surface is Bottle. Deformation appears in Bottle.

When I reverse the case, Still deformation is in Bottle.

My target is to deform Cap.

what can I do?

Altair Forum User

Hi,

In your case you have applied same material for both cap and bottle. You can try with a less stiffer material for the cap and a high stiffer one for the bottle.

Harsh2610

Hi,

In your case you have applied same material for both cap and bottle. You can try with a less stiffer material for the cap and a high stiffer one for the bottle.

In earlier run I try it. Still same result.

I tried High Density PE for Bottle and Low Density PE for cap.

Altair Forum User

Hi,

Please send me the same model (High Density PE for Bottle and Low Density PE for cap model) with final h3d file also.

Harsh2610

Hello George,

Please go through attachment.

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Harsh2610

Hello,

Any updates?

Altair Forum User

Hi,

The model set up is fine, but this issue is with the material properties.

Instead of making the cap model rigid model it with a less stiffer material, and by this you can make the cap deformable, but slight deformations will be there in the bottle component. The user should have the right material properties for getting the exact behavior during simulation.

Harsh2610

Hello George,

Thank you.

I already made some changes and run is going on.

I remove the plate component and apply load on top surface nodes of cap. Material is same as previous model.

Cap is master surface and bottle is Slave surface.

I will let you know once run is complete