Abaqus Scripting Reference Manual  


59.106 Viscoelastic object

The Viscoelastic object specifies dissipative behavior for use with elasticity.

Access
materialApi.materials()[name].viscoelastic()


59.106.1 Viscoelastic(...)

This method creates a Viscoelastic object.

Path
materialApi.materials()[name].Viscoelastic
Prototype
odb_Viscoelastic&
Viscoelastic(const odb_String& domain,
           const odb_SequenceSequenceDouble& table,
           const odb_String& frequency,
           const odb_String& type,
           const odb_String& preload,
           const odb_String& time,
           double errtol,
           int nmax,
           const odb_SequenceSequenceDouble& volumetricTable);

Required arguments

domain

An odb_String specifying the domain definition. Possible values are:

  • "FREQUENCY", specifying a frequency domain. This domain is only available for an Abaqus/Standard analysis.

  • "TIME", specifying a time domain.

table

An odb_SequenceSequenceDouble specifying the items described below.

Optional arguments

frequency

An odb_String specifying the frequency domain definition. This argument is required only when domain="FREQUENCY". Possible values are "FORMULA", "TABULAR", "PRONY", "CREEP_TEST_DATA", and "RELAXATION_TEST_DATA". The default value is "FORMULA".

type

An odb_String specifying the type. This argument is required only when domain="FREQUENCY" and frequency="TABULAR". Possible values are "ISOTROPIC" and "TRACTION". The default value is "ISOTROPIC".

preload

An odb_String specifying the preload. This argument is required only when domain="FREQUENCY" and frequency="TABULAR". Possible values are "NONE", "UNIAXIAL", "VOLUMETRIC", and "UNIAXIAL_VOLUMETRIC". The default value is "NONE".

time

An odb_String specifying the time domain definition. This argument is required only when domain="TIME". Possible values are "PRONY", "CREEP_TEST_DATA", "RELAXATION_TEST_DATA", and "FREQUENCY_DATA". The default value is "PRONY".

errtol

A Double specifying the allowable average root-mean-square error of the data points in the least-squares fit. The Float values correspond to percentages; for example, 0.01 is 1%. The default value is 0.01.

This argument is valid only when time="CREEP_TEST_DATA", "RELAXATION_TEST_DATA" or "FREQUENCY_DATA"; or only when frequency="CREEP_TEST_DATA" or "RELAXATION_TEST_DATA".

nmax

An Int specifying the maximum number of terms in the Prony series. The maximum value is 13. The default value is 13.

This argument is valid only when time="CREEP_TEST_DATA", "RELAXATION_TEST_DATA" or "FREQUENCY_DATA"; or only when frequency="CREEP_TEST_DATA" or "RELAXATION_TEST_DATA".

volumetricTable

An odb_SequenceSequenceDouble specifying the items described below. The default value is an empty sequence.

Table data

If frequency=FORMULA, the table data for table specify the following:

  • Real part of .

  • Imaginary part of .

  • Value of .

  • Real part of . If the material is incompressible, this value is ignored.

  • Imaginary part of . If the material is incompressible, this value is ignored.

  • Value of . If the material is incompressible, this value is ignored.

If frequency=TABULAR and type=ISOTROPIC and preload=NONE, or time=FREQUENCY_DATA the table data for table specify the following:

  • Real part of .

  • Imaginary part of .

  • Real part of . If the material is incompressible, this value is ignored.

  • Imaginary part of . If the material is incompressible, this value is ignored.

  • Frequency in cycles per time.

If frequency=TABULAR and type=ISOTROPIC and preload=UNIAXIAL the table data for table specify the following:

  • Loss modulus.

  • Storage modulus.

  • Frequency.

  • Uniaxial strain.

If frequency=TABULAR and type=TRACTION and preload=NONE the table data for table specify the following:

  • Normalized loss modulus.

  • Normalized shear modulus.

  • Frequency.

If frequency=TABULAR and type=TRACTION and preload=UNIAXIAL or preload=UNIAXIAL_VOLUMETRIC the table data for table specify the following:

  • Loss modulus.

  • Storage modulus.

  • Frequency.

  • Closure.

If time=PRONY or frequency=PRONY, the table data for table specify the following:

  • , the modulus ratio in the first term in the Prony series expansion of the shear relaxation modulus.

  • , the modulus ratio in the first term in the Prony series expansion of the bulk relaxation modulus.

  • , the relaxation time for the first term in the Prony series expansion.

If frequency=TABULAR and type=ISOTROPIC and preload=VOLUMETRIC or preload=UNIAXIAL_VOLUMETRIC the table data for volumetricTable specify the following:

  • Loss modulus.

  • Storage modulus.

  • Frequency.

  • Volume ratio.

Return value

A Viscoelastic object.

Exceptions

RangeError.


59.106.2  Members

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

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

Prototype
odb_CombinedTestData combinedTestData() const;
odb_ShearTestData shearTestData() const;
odb_Trs trs() const;
odb_VolumetricTestData volumetricTestData() const;
combinedTestData
shearTestData

A ShearTestData object.

trs

A Trs object.

volumetricTestData


59.106.3  Corresponding analysis keywords

*VISCOELASTIC