ABAQUS Volume II: I–Z - Manual (Page 331)

*RATE DEPENDENT
17.8 *RATE DEPENDENT: Define a rate-dependent viscoplastic model.
This option can be used in conjunction with the *PLASTIC option (HARDENING=ISOTROPIC only), the
*DRUCKER PRAGER HARDENING option, and/or the *CRUSHABLE FOAM HARDENING option to
introduce strain rate dependence in the material models.
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model data
Level: Model
References:
•
“Rate-dependent yield,” Section 18.2.3 of the ABAQUS Analysis User’s Manual
•
“Classical metal plasticity,” Section 18.2.1 of the ABAQUS Analysis User’s Manual
•
“Johnson-Cook plasticity,” Section 18.2.7 of the ABAQUS Analysis User’s Manual
•
“Extended Drucker-Prager models,” Section 18.3.1 of the ABAQUS Analysis User’s Manual
•
“Crushable foam plasticity models,” Section 18.3.5 of the ABAQUS Analysis User’s Manual
Optional parameters:
DEPENDENCIES
In an ABAQUS/Explicit analysis this parameter is relevant only for TYPE=POWER LAW or
TYPE=YIELD RATIO.
Set this parameter equal to the number of field variable dependencies in the definition of
material parameters, in addition to temperature. If this parameter is omitted, it is assumed that
the rate-dependent material behavior depends only on temperature. See “Specifying field variable
dependence” in “Material data definition,” Section 16.1.2 of the ABAQUS Analysis User’s
Manual, for more information.
TYPE
Set TYPE=POWER LAW (default) to specify the Cowper-Symonds overstress power law.
Set TYPE=JOHNSON COOK in an ABAQUS/Explicit analysis to specify Johnson-Cook rate
dependence (this option must be used with the Johnson-Cook hardening model).
Set TYPE=YIELD RATIO to enter yield stress ratios.
If this option is used in conjunction with the *CRUSHABLE FOAM option, the static
hardening relation must be defined on the *CRUSHABLE FOAM HARDENING option.
17.8–1
ABAQUS Version 6.1 Module: ID:
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