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USER MATERIAL
20.6
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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/Standar d it
is also used to input material constants for use in a user-defined therm al material model (user subroutine
UMATHT).
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model data
Level: Model
References:
•
“User-defined m echanical material behavior,” Section 20.8.1 of the ABAQUS Analysis User ’s Manual
•
“User-defined thermal material behavior,” Section 20.8.2 of the ABAQU S Analysis U ser’s Manual
•
“UMAT,” Section 1.1.31 of the ABAQUS User Subroutines Reference M anual
•
“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 m aterial are
being modeled, the
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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
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