DruckerPrager object

The DruckerPrager object specifies the extended Drucker-Prager plasticity model.

The following topics are discussed:

Access

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

DruckerPrager(...)

This method creates a DruckerPrager object.

Path

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

Required arguments

table

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

Optional arguments

shearCriterion

A SymbolicConstant specifying the yield criterion. Possible values are LINEAR, HYPERBOLIC, and EXPONENTIAL. The default value is LINEAR.

This argument applies only to Abaqus/Standard analyses. Only the linear Drucker-Prager model is available in Abaqus/Explicit analyses.

eccentricity

A Float specifying the flow potential eccentricity, ϵ, a small positive number that defines the rate at which the hyperbolic flow potential approaches its asymptote. The default value is 0.1.

This argument applies only to Abaqus/Standard analyses.

testData

A Boolean specifying whether the material constants for the exponent model are to be computed by Abaqus/Standard from triaxial test data at different levels of confining pressure. The default value is OFF.

This argument is valid only if shearCriterion=EXPONENTIAL.

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.

Table data

If shearCriterion=LINEAR (the only option allowed in an Abaqus/Explicit analysis), the table data specify the following:

  • Material angle of friction, β, in the p–t plane. Give the value in degrees.

  • K, the ratio of the flow stress in triaxial tension to the flow stress in triaxial compression. 0.778≤K≤1.0. If the default value of 0.0 is accepted, a value of 1.0 is assumed.

  • Dilation angle, ψ, in the p–t plane. Give the value in degrees.

  • 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 shearCriterion=HYPERBOLIC, the table data specify the following:

  • Material angle of friction, β, at high confining pressure in the p–q plane. Give the value in degrees.

  • Initial hydrostatic tension strength, pt|0.

  • Dilation angle, ψ, at high confining pressure in the p–q plane. Give the value in degrees.

  • 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 shearCriterion=EXPONENTIAL, the table data specify the following:

  • Dilation angle, ψ, at high confining pressure in the p–q plane. Give the value in degrees.

  • 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.

Return value

A DruckerPrager object.

Exceptions

RangeError.

setValues(...)

This method modifies the DruckerPrager object.

Required arguments

None.

Optional arguments

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

Return value

None.

Exceptions

RangeError.

Members

The DruckerPrager object has members with the same names and descriptions as the arguments to the DruckerPrager method.

In addition, the DruckerPrager object can have the following members:

druckerPragerCreep

A DruckerPragerCreep object.

druckerPragerHardening

A DruckerPragerHardening object.

rateDependent

A RateDependent object.

triaxialTestData

A TriaxialTestData object.

Corresponding analysis keywords