Plastic object

The Plastic object specifies a metal plasticity model.

This page discusses:

Access

import material
mdb.models[name].materials[name].plastic
import odbMaterial
session.odbs[name].materials[name].plastic

Plastic(...)

This method creates a Plastic object.

Path

mdb.models[name].materials[name].Plastic
session.odbs[name].materials[name].Plastic

Required arguments

table

A sequence of sequences of Floats specifying the items described below.

Optional arguments

hardening

A SymbolicConstant specifying the type of hardening. Possible values are ISOTROPIC, KINEMATIC, COMBINED, JOHNSON_COOK, and USER. The default value is ISOTROPIC.

rate

A Boolean specifying whether the data depend on rate. The default value is OFF.

dataType

A SymbolicConstant specifying the type of combined hardening. This argument is only valid if hardening=COMBINED. Possible values are HALF_CYCLE, PARAMETERS, and STABILIZED. The default value is HALF_CYCLE.

strainRangeDependency

A Boolean specifying whether the data depend on strain range. This argument is only valid if hardening=COMBINED and dataType=STABILIZED. The default value is OFF.

numBackstresses

An Int specifying the number of backstresses. This argument is only valid if hardening=COMBINED. The default value is 1.

temperatureDependency

A Boolean specifying whether the data depend on temperature. The default value is OFF.

dependencies

An Int specifying the number of field variable dependencies. The default value is 0.

extrapolation

A SymbolicConstant specifying the extrapolation method for the yield stress with respect to the equivalent plastic strain. This argument is valid only if hardening=ISOTROPIC. Possible values are CONSTANT and LINEAR . The default value is CONSTANT.

Table data

If hardening=ISOTROPIC, or if hardening=COMBINED and dataType=HALF_CYCLE, the table data specify the following:

  • Yield stress.

  • Plastic strain.

  • Equivalent plastic strain rate, ε¯˙p⁢l.

  • Temperature, if the data depend on temperature.

  • Value of the first field variable, if the data depend on field variables.

  • Value of the second field variable.

  • Etc.

If hardening=COMBINED and dataType=STABILIZED, the table data specify the following:

  • Yield stress.

  • Plastic strain.

  • Strain range, if the data depend on strain range.

  • Temperature, if the data depend on temperature.

  • Value of the first field variable, if the data depend on field variables.

  • Value of the second field variable.

  • Etc.

If hardening=COMBINED and dataType=PARAMETERS, the table data specify the following:

  • Yield stress at zero plastic strain.

  • The first kinematic hardening parameter, C1.

  • The first kinematic hardening parameter, γ1.

  • If applicable, the second kinematic hardening parameter, C2.

  • If applicable, the second kinematic hardening parameter, γ2.

  • Etc.

  • Temperature, if the data depend on temperature.

  • Value of the first field variable, if the data depend on field variables.

  • Value of the second field variable.

  • Etc.

If hardening=KINEMATIC, the table data specify the following:

  • Yield stress.

  • Plastic strain.

  • Temperature, if the data depend on temperature.

If hardening=JOHNSON_COOK, the table data specify the following:

  • A.

  • B.

  • n.

  • m.

  • Melting temperature.

  • Transition temperature.

If hardening=USER, the table data specify the following:

  • Hardening properties.

Return value

A Plastic object.

Exceptions

RangeError.

setValues(...)

This method modifies the Plastic object.

Required arguments

None.

Optional arguments

The optional arguments to setValues are the same as the arguments to the Plastic method.

Return value

None.

Exceptions

RangeError.

Corresponding analysis keywords