ClayPlasticity object

The ClayPlasticity object specifies the extended Cam-clay plasticity model.

The following topics are discussed:

Access

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

ClayPlasticity(...)

This method creates a ClayPlasticity object.

Path

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

Required arguments

table

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

Optional arguments

intercept

None or a Float specifying e1, the intercept of the virgin consolidation line with the void ratio axis in a plot of void ratio versus the logarithm of pressure stress. The default value is None.

This argument is valid only if hardening=EXPONENTIAL.

hardening

A SymbolicConstant specifying the type of hardening/softening definition. Possible values are EXPONENTIAL and TABULAR. The default value is 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 hardening=EXPONENTIAL, the table data specify the following:

  • Logarithmic plastic bulk modulus, λ (dimensionless).

  • Stress ratio at critical state, M.

  • The initial yield surface size, a0.

  • β, the parameter defining the size of the yield surface on the “wet” side of critical state.

  • 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.

  • 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=TABULAR, the table data specify the following:

  • Stress ratio at critical state, M.

  • The initial volumetric plastic strain, εvolp⁢l|0, corresponding to pc|0 according to the ClayHardening definition.

  • β, the parameter defining the size of the yield surface on the “wet” side of critical state.

  • K, the ratio of the flow stress in triaxial tension to the flow stress in triaxial compression. 0.778≤K≤1.0.

  • 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 ClayPlasticity object.

Exceptions

RangeError.

setValues(...)

This method modifies the ClayPlasticity object.

Required arguments

None.

Optional arguments

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

Return value

None.

Exceptions

RangeError.

Members

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

In addition, the ClayPlasticity object can have the following member:

clayHardening

A ClayHardening object.

Corresponding analysis keywords