Learning Forum

[Amrith Mariappan]

Hi everyone,

I’m planning to run a hypervelocity impact simulation in LS-DYNA using a custom material model (UMAT). According to the LS-DYNA manual, I need the UserMat package—a compressed archive containing precompiled static libraries (.a/.lib), Fortran source files (.f/.F), include files (.inc), and a makefile—to compile and link my UMAT subroutine.

Our university holds both commercial and academic LS-DYNA licenses, but our IT department couldn’t locate this package. Could anyone advise on how to obtain and install the UserMat package for LS-DYNA? Any guidance or pointers to the right download/source would be greatly appreciated.

Thanks in advance!

[Pedram Samadian]

Hi Amrith,

 

You need to contact the Ansys account manager and request access to the UMAT packages. Your university IT department should know the contact information. 

 

I hope this answer is helpful. Please let me know if you have any questions.

 

Thanks,

Pedram

 

[Amrith Mariappan]

Thank you so much. I appreciate it.

 

[Pedram Samadian]

You are most welcome.

Regards

[Amrith Mariappan]

Hi,

 

Our university IT contacted our ANSYS account manager about the LS-DYNA UserMat package. The manager responded that they don’t have a separate package to send—only instructions for users to develop their own UMATs.

 

However, the LS-DYNA manual refers to a compressed UserMat package containing files like dyn21.f (and related libraries) that are needed to integrate custom material models. Neither I nor our IT department can find these files on our systems.

 

Could you clarify:

 

Whether ANSYS provides a downloadable UserMat package with source and library files?

 

If so, where it can be accessed or how to request it?

 

If not, how are we expected to obtain the necessary files (e.g., dyn21.f) to compile a UMAT in LS-DYNA?

 

Any guidance would be greatly appreciated!

 

 

Thanks, Amrith

[Pedram Samadian]

Hi Amrith,

 

May I know the name of your university and the Ansys account manager? I'll contact him directly about it and keep you posted.

 

Thanks,

Pedram

[Amrith Mariappan]

Hi,

I discovered the Objects download link here:
https://ftp.lstc.com/objects/

Our IT team shared it with our ANSYS account manager, and they provided the credentials needed to access and download the files. Thanks!

[Pedram Samadian]

Hi Amrith,

 

Thanks for letting me know. I was expecting the account manager to send you all this when you initially contacted him. Based on his primary response, he might have misunderstood the request.

 

Anyways, I am happy you have access to the files now.

 

Good luck,

Pedram