UMAT XML file

The UMAT XML file contains the methods, properties, and so on that define:

• The labels in the Material dialog box.

• The format of the values entered in the Material dialog box and in user-defined material (UMAT) bulk entries in the solver input file.

• The mapping of the properties to the Simcenter Nastran MUMAT bulk entry.

The UMAT XML file must have a .umatx extension.

The Document Type Definition (DTD) file for the UMAT XML file resides in this software's installation structure as ..\ugii\materials\nxnastran_umat.dtd. The DTD defines the building blocks of the UMAT XML file that you must provide. It defines the document structure with a list of legal elements and attributes. The DTD file contains documentation on its usage.

For a sample UMAT XML file that explains the key data, see Sample UMAT XML file.

An example .umatx file, source code examples, and compiled examples also reside at various locations in the Simcenter Nastran installation. For more information, see User defined materials.

How do I

Sample UMAT XML file

Add UMAT property values to MatML Library material definitions (site MatML Library owner)

Define a material with a UMAT model from scratch

Define a material with a UMAT model from a standard library definition

Define configurable material properties (site MatML Library owner)

Modify configurable material properties (end user)

Export a material with a UMAT model

Define, specify, and plot state variables

Learn more

Simcenter Nastran user-defined material models

UMAT workflow

Simcenter Nastran UMAT subroutine

Prerequisites for a solution to use a UMAT model

Submit solution to Simcenter Nastran

Look up more details

UMAT troubleshooting

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

UMAT XML file, Simcenter 3D 2021.1 Series

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