ABAQUS Volume II: I–Z - Manual (Page 595)

*USER MATERIAL
20.6 *USER MATERIAL: Define material constants for use in subroutine
UMAT, UMATHT, or
VUMAT.
This option is used to input material constants for use in a user-defined mechanical model (user subroutine
UMAT
in ABAQUS/Standard or user subroutine VUMAT in ABAQUS/Explicit). In ABAQUS/Standard it
is also used to input material constants for use in a user-defined thermal material model (user subroutine
UMATHT
).
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model data
Level: Model
References:
•
“User-defined mechanical material behavior,” Section 20.8.1 of the ABAQUS Analysis User’s Manual
•
“User-defined thermal material behavior,” Section 20.8.2 of the ABAQUS Analysis User’s Manual
•
“UMAT,” Section 1.1.31 of the ABAQUS User Subroutines Reference Manual
•
“UMATHT,” Section 1.1.32 of the ABAQUS User Subroutines Reference Manual
•
“VUMAT,” Section 1.2.4 of the ABAQUS User Subroutines Reference Manual
Required parameter:
CONSTANTS
Set this parameter equal to the number of constants being entered.
Optional parameters:
TYPE
This parameter applies only to ABAQUS/Standard analyses.
Set TYPE=MECHANICAL (default) if the constants are used in defining the mechanical
behavior of the material.
Set TYPE=THERMAL if the constants are used in defining the thermal constitutive behavior
of the material.
If both the user-defined mechanical and the user-defined thermal behavior of the material are
being modeled, the *USER MATERIAL option should be repeated in the material data block such
that each value of the TYPE parameter is used.
UNSYMM
This parameter applies only to ABAQUS/Standard analyses.
20.6–1
ABAQUS Version 6.1 Module: ID:
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