UMAT in LS DYNA

Fengling Zhang

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Nov 30, 2020, 3:58:35 AM11/30/20

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Dear All,

Currently, I am working on user-defined material subroutines for accurately simulating the response of concrete structures against impact or blast. To run the code, I need the so-called "usermat package". However, I cannot find it by myself.

I am writing this email to enquiry that whether anyone can provide me with a copy of the usermat package, which includes several files such as library files(*.a), object files (*.o), include files (*.inc), Fortran files (*.f) and a Makefile.

Thank you in advance for your kind help and sorry again for any inconvenience caused.

Thanks and best regards,
Fengling

James M. Kennedy

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Nov 30, 2020, 3:45:26 PM11/30/20

to Fengling Zhang, ls-d...@googlegroups.com

Dear Fengling,

Something that may be of help:

https://www.researchgate.net/publication/327623424_How_To_-_user_defined_material_models_with_LS-Dyna_on_Windows

https://ftp.lstc.com/anonymous/outgoing/support/FAQ/user_defined_materials.faq

Sincerely,

James M. Kennedy

KBS2 Inc.

November 30, 2020

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Shadi Alam

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Dec 8, 2020, 9:43:55 AM12/8/20

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Dear Fengling,

You may wanna check

https://ftp.lstc.com/anonymous/outgoing/support/PRESENTATIONS/mpp_201305.pdf

It includes links to the files you're looking for. Look for "objects" in the PDF.

Regards,
Shadi

Shadi Alam

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Mar 2, 2021, 4:14:22 AM3/2/21

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Dear all,

I'm implementing a user-defined thermomechanical material model. However, I'm facing a couple of problems.

- Any idea where to find "heat flux"? I can see that it's written to the d3plot file but I want to access the result from within the material model (in a similar way to accessing stresses)

- Also I want to compute the volume average of these fluxes and stresses so I need the weights at integration points. The closest thing I found is "common/aux9loc/vlrho(nlq),voln(nlq)" but this contains the volume of the whole element so "voln" doesn't change from one integration point to another within the same element. To be clear I'm looking for the integration_weight * det(Jacobian).