Learning Forum

[junyi.lee]

Hello,

May I please know:

1. Whether it is possible to simulate blow molding with a multi-layer parison in Discovery AIM?
2. If so, then with reference to this application example (https://ansyskm.ansys.com/forums/topic/discovery-aim-extrusion-blow-molding-of-a-bottle), which is good, but for a multi-layer parison, should I add more parison bodies/faces in SpaceClaim?
3. It seems that without adding parison bodies in SpaceClaim/Geometry, it is possible to add more material assignments (e.g. PolyCarbonate for Extrusion (498K)) along with more corresponding Initial Layer Thicknesses in AIM. Is this the right approach to simulate multi-layer parison blow molding in AIM?
4. If this is the right approach to simulate multi-layer blow molding in AIM, then is there a way to specify the order of the different layers (e.g. which is the innermost layer, the middle one and the outermost layer)?
5. While trying to add two layers of PolyCarbonate in AIM, an error message appears: "2 materials cannot have the same name (PolyCarbonate for Extrusion (498K))". So I tried to make a copy of PolyCarbonate for Extrusion with a different name, but the error is still present. An archived file is attached for your reference. Is it possible to have two layers of the same material?
6. In terms of the material properties of PolyCarbonate for Extrusion (498K), there are several variables under Viscosity - Carreau-Yasuda Law. However, while trying to add a new material, it seems that it is only possible to specify a single value for the dynamic viscosity?
7. Is there a way to visualise the interfaces between the different layers? Or does, for example, "Thickness 3" as a result variable correspond to "Initial Layer Thickness 3" as an initial condition?
8. Or in the end, is the capability to simulate multi-layer parison blow molding only present in ANSYS Polyflow at the moment?

Looking forward to your response and thank you very much for your kind assistance.

Kind regards,

Jun

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[Subashni Ravichandran]

Hello Jun

I'm consulting with my team on your query. I will get back to you soon.

[Subashni Ravichandran]

Hello Jun

I had a discussion with the expert on this topic and here's what I gathered.
It is possible to simulate multi-layer blow moulding. I have attached an example file with 2 layers and 4 layers. Please refer.

As seen in the attached files, no additional geometry needs to be added to simulate layers. As you have rightly mentioned, adding 'Initial layers' should work.
Although, I'm not sure what is the chronology in which the layers are considered or how the layer interfaces can be viewed in the results. I will need to discuss this further with the Team.

I could recreate the error you were facing in my models as well. Changing the name does not help.
Although, when I created a completely new material but with the exact same properties of an existing material, the error did not occur. (observe Material 6 and PolyCarbonate for Extrusion in 'Bottle_4layer_Blow_molding_test' file.)
I will be discussing this issue with the experts as well and reporting this error to the development team as required.

🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions

[junyi.lee]

Hello Subashni 

Thank you for your kind assistance. It seems that the file which you have attached is 'bottle-aim_2layers'. May I please have a look at the 'Bottle_4layer_Blow_molding_test' file?

[Subashni Ravichandran]

Hello Jun

Unfortunately, the model failed to attach to my previous comment. I have attached it again here.
Also, upon further inputs from my team I gathered that the model with several layers is equivalent to a model with a single layer having material characteristics resulting from the combination of the different layers.
The model remains a shell, a surface in 3D without any thickness.

There is no interface between layers.

The deformation of each layer is the same as one assumes that there is no slipping between layers.

If a layer sees a surface extension, all the layers see the very same extension.

I hope this explanation is clear to you.

🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions