Learning Forum

[zxhurs]

Hello all, 

I saw a brief mention in the LS-DYNA Manual Volume R12 about the possibility of transferring MF data to LS-DYNA (generating an Initial_Stress_Shell), but the actual process doesn’t seem to work well in practice. Does anyone know the detailed steps? Also, how can I verify if the imported data is correct after importing?

Thanks

[Reno Genest]

Hello,

You can use the "Injection Molding Data" system in Ansys Workbench to import Moldflow data and map it onto an LS-DYNA model:

You will find more information in the Ansys documentation:

Injection Molding Data (ansys.com)

 

Let me know how it goes.

 

Reno.

[Reno Genest]

Hello,

There are some limitations for the LS-DYNA system and you will find them in the documentation:

5.3. LS-DYNA Analyses (ansys.com)

 

There is more information about the injection molding workflow in the Short Fiber Composites Guide:

Short Fiber Composites Guide (ansys.com)

 

Let me know how it goes.

 

Reno.

[zxhurs]

 

Hello Reno, 

Thank you very much for your suggestion. Apologies, I may not have been detailed enough in my explanation. I found a window related to Moldflow in Le Prepost 4.7, as shown in the image below. I’m trying to use this window to map data, including fiber tensor data from Moldflow, into LS-DYNA. I’m confused about how to use this window because there isn’t a specific guide, especially for the “Pick Segments” option. I selected two mutually perpendicular surfaces, but the results displayed are quite confusing. Do you know what the issue might be? Or what the specific steps are?

I really appreciate your advice. I personally prefer trying to run it in LS-PrePost first. If it doesn’t work, I’ll try doing it in Ansys Workbench. Your suggestion might lead to a better outcome, but I still want to give this a try, as there’s already an existing window for Moldflow to LS-DYNA conversion.

Thanks!

[zxhurs]

The data is weird.

 

 

[Reno Genest]

Hello,

Moldflow is not supported by LS-PrePost and this feature has been removed from the latest releases of LS-PrePost. We recommend using the Workbench workflow for now. 

 

Let me know how it goes.

 

Reno.

[zxhurs]

Hello Reno, 

thank you very much for informing me. I noticed from the information you provided: "The LS-DYNA system does not support the Imported Initial Stress object from the Injection Molding Data system." However, the Initial Stress data is indeed a crucial part for me. I would like to confirm if there is any way to resolve this issue, and if the inability to import the initial stress would affect the subsequent results.

The information is as follows: Notes and Limitations 6.

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v242/en/acp_fiber/acp_fiber_workflow_wb_lsdyna.html
Notes and Limitations 6.

[Reno Genest]

Hello,

One workaround I see is to use the Envyo tool developped by DynaMore (now part of Ansys):

https://www.dynamore.de/en/products/process-chain/envyo

https://www.youtube.com/watch?v=DvOchqNhaZA

You can contact them to see how you can get access to Envyo.

I will also contact our product manager to know if the initial stress will be imported in the LS-DYNA system in future releases of Ansys.

 

Reno.

[Reno Genest]

Hello,

The product manager confirmed that mapping initial stresses from Moldflow using the Injection Molding Data system to the LS-DYNA system in Workbench is not in the development plan for now.

So, the only option for now is to use the Envyo tool. Please contact Christian Liebold for more information about Envyo. You will find Christian's information on the right hand side of the following webpage:

Envyo — LS-DYNA and services from DYNAmore Website

Also, if you are a commercial customer, please create a support case on the Ansys Customer Support Space (ACSS) and we will be able to help you better (exchange data more freely, etc.):

customer.ansys.com

 

Let me know how it goes.

 

Reno.

[zxhurs]

Hello Reno, 

Thank you very much for the information. I am currently writing an email to Mr. Liebold. Unfortunately, there is no corresponding interface. I don’t want to waste my previous efforts. I would like to ask, besides Moldflow, would other software like Moldex3D provide the effect I hope for? Or should I just rely on Envyo?

Thanks！😊

[Reno Genest]

Hello,

You can import Moldex3D data in LS-PrePost. Go to Application > Plastics Analysis > Import Data from Moldex3D:

Import the Moldex3D .mdx file which contains the initial stresses, fiber orientation, etc.:

You will find the complete procedure at the end of *MAT_303 in the LS-DYNA User Manual Vol II:

LSDYNA Manuals (ansys.com)

 

We recommend using the latest version of LS-Prepost:

Index (lstc.com)

 

Let us know how it goes.

 

Reno.