*PLASTIC

Specify a metal plasticity model.

This option is used to specify the plastic part of the material model for elastic-plastic materials that use the Mises or Hill yield surface.

Related Topics
In Other Guides
Classical metal plasticity
Models for metals subjected to cyclic loading
Johnson-Cook plasticity
Permanent set in rubberlike materials
UHARD
VUHARD

ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE

TypeModel data

LevelModel

Abaqus/CAEProperty module

Optional parameters

HARDENING

Set HARDENING=ISOTROPIC (default) to specify isotropic hardening.

Set HARDENING=KINEMATIC to specify linear kinematic hardening.

Set HARDENING=MULTILINEAR KINEMATIC to specify multilinear kinematic hardening.

Set HARDENING=COMBINED to specify nonlinear isotropic/kinematic hardening.

Set HARDENING=JOHNSON COOK to specify Johnson-Cook hardening.

Set HARDENING=USER to define isotropic hardening in user subroutine UHARD in an Abaqus/Standard analysis or user subroutine VUHARD in an Abaqus/Explicit analysis.

SCALESTRESS

This parameter cannot be used with the HARDENING parameter.

Set this parameter equal to the factor by which you want the yield stress to be scaled.

Optional parameter for use with HARDENING=ISOTROPIC or HARDENING=COMBINED

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of hardening behavior, in addition to temperature and possibly strain range. If this parameter is omitted, the hardening behavior does not depend on field variables. See Material data definition for more information.

Optional parameter for use with HARDENING=ISOTROPIC

RATE

Set this parameter equal to the equivalent plastic strain rate, ε¯˙p⁢l, for which this stress-strain curve applies.

Optional parameters for use with HARDENING=COMBINED

DATA TYPE

Set DATA TYPE=HALF CYCLE (default) to specify stress versus plastic strain values of the first half-cycle for calibrating the kinematic hardening parameters.

Set DATA TYPE=PARAMETERS to specify the calibrated kinematic hardening material parameters directly.

Set DATA TYPE=STABILIZED to specify stress versus plastic strain values of a stabilized cycle for calibrating the kinematic hardening parameters.

NUMBER BACKSTRESSES

Set this parameter equal to the number of backstresses. The default number of backstresses is 1, and the maximum allowed is 10.

Optional parameter for use with HARDENING=USER

PROPERTIES

Set this parameter equal to the number of property values needed as data in user subroutine UHARD in Abaqus/Standard analyses and user subroutine VUHARD in Abaqus/Explicit analyses. The default is PROPERTIES=0.

Data lines for HARDENING=ISOTROPIC or HARDENING=COMBINED with DATA TYPE=HALF CYCLE

First line

  1. Yield stress.

  2. Plastic strain.

  3. Temperature.

  4. First field variable.

  5. Second field variable.

  6. Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five)

  1. Sixth field variable.

  2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of yield stress on plastic strain and, if needed, on temperature and other predefined field variables.

Data lines for HARDENING=COMBINED with DATA TYPE=STABILIZED

First line

  1. Yield stress.

  2. Plastic strain.

  3. Strain range.

  4. Temperature.

  5. First field variable.

  6. Second field variable.

  7. Etc., up to four field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)

  1. Fifth field variable.

  2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of yield stress on plastic strain and, if needed, on strain range, temperature, and other predefined field variables.

Data lines for HARDENING=COMBINED with DATA TYPE=PARAMETERS

First line

  1. Yield stress at zero plastic strain.

  2. Kinematic hardening parameter, C1.

  3. Kinematic hardening parameter, γ1.

  4. Etc., specify kinematic hardening parameters Ck and γk for each backstress k. (Only needed if the NUMBER BACKSTRESSES parameter has a value greater than 1.)

  5. Temperature.

  6. First field variable.

  7. Second field variable.

  8. Etc., up to eight entries per line.

Subsequent lines (only needed if the number of entries is greater than eight)

  1. Etc., up to eight entries per line.

Repeat this set of data lines as often as necessary to define the dependence of yield stress and kinematic hardening parameters Ck and γk on temperature and other predefined field variables.

Data lines for HARDENING=KINEMATIC

First line

  1. Yield stress.

  2. Plastic strain.

  3. Temperature, if temperature dependent.

Repeat this data line a maximum of two times to define linear kinematic hardening independent of temperature. Repeat this set of data lines as often as necessary to define a variation of the linear kinematic hardening modulus with respect to temperature.

Data lines for HARDENING=MULTILINEAR KINEMATIC

First line

  1. Yield stress.

  2. Plastic strain.

  3. Temperature, if temperature dependent.

  4. First field variable.

  5. Second field variable.

  6. Etc., up to eight entries per line.

Subsequent lines (only needed if the number of entries is greater than eight)

  1. Etc., up to eight entries per line.

Repeat this set of data lines as often as necessary to define the dependence of yield stress on plastic strain and, if needed, on temperature and other predefined field variables.

Data line for HARDENING=JOHNSON COOK

First (and only) line

  1. A.

  2. B.

  3. n.

  4. m.

  5. Melting temperature, θmelt.

  6. Transition temperature, θtransition.

Data lines for HARDENING=USER with PROPERTIES

First line

  1. Give the hardening properties, eight per line.

Repeat this data line as often as necessary to define all hardening properties.