Engineering Data Curve Fit

Engineering Data Curve Fit
The container used by Engineering Data to maintain data for curve fitting operations.

Data Entities

CurveFit

The entity to store curve fitting information.

Properties

CurveFitData

The coefficients of material model that approximates the experimental test data.

Type DataReference
Read Only No

DependentPropertyColl

The collection of experimental test data, e.g., Uniaxial Test data (Engineering Strain Vs Engineering Stress).

Type DataReferenceSet
Read Only No

DisplayText

The general property that defines the user-visible name of an entity. This property is defined for all data entities but is used only in those entities that present a label in the user interface.

Type string
Read Only No

UnitSystemWhenSolved

The unit system of the coefficients of material model.

Type string
Read Only No

Methods

AddTestData

Adds test data from a given curve fitting.

Required Arguments

TestData The test data property to add.
Type DataReference

Example

The following example loads a material with experimental test data and a Neo-Hookean hyperelastic property.

    template = GetTemplate(TemplateName="EngData")
    system = template.CreateSystem()
    engineeringData = system.GetContainer(ComponentName="Engineering Data")
    neopreneRubber = engineeringData.ReadMaterial(
        Name="Neoprene Rubber",
        Source="Hyperelastic_Materials.xml")
    neoHookeanProperty = neopreneRubber.GetProperty(Name="Neo-Hookean")
    neoHookeanPropertyData = neoHookeanProperty.GetPropertyData(Name="Neo-Hookean")
    curveFit = neoHookeanPropertyData.CreateCurveFitting(
        Type="Neo-Hookean",
        Definition="")
    uniaxialProperty = neopreneRubber.GetProperty(Name="Uniaxial Test Data")
    curveFit.AddTestData(TestData=uniaxialProperty)
    biaxialProperty = neopreneRubber.GetProperty(Name="Biaxial Test Data")
    curveFit.AddTestData(TestData=biaxialProperty)
    shearProperty = neopreneRubber.GetProperty(Name="Shear Test Data")
    curveFit.AddTestData(TestData=shearProperty)
    volumetricProperty = neopreneRubber.GetProperty(Name="Volumetric Test Data")
    curveFit.AddTestData(TestData=volumetricProperty)
    curveFit.RemoveTestData(TestData=uniaxialProperty)
    curveFit.AddTestData(TestData=uniaxialProperty)
    curveFit.Solve()
    curveFit.CopyCoefficients(Destination=neoHookeanPropertyData)
    curveFit.Delete()

CopyCoefficients

Copies the fitted coefficients from the curve fitting to the property data provided.

Required Arguments

Destination The property data that will receive the coefficients.
Type DataReference

Example

The following example loads a material with experimental test data and a Neo-Hookean hyperelastic property.

    template = GetTemplate(TemplateName="EngData")
    system = template.CreateSystem()
    engineeringData = system.GetContainer(ComponentName="Engineering Data")
    neopreneRubber = engineeringData.ReadMaterial(
        Name="Neoprene Rubber",
        Source="Hyperelastic_Materials.xml")
    neoHookeanProperty = neopreneRubber.GetProperty(Name="Neo-Hookean")
    neoHookeanPropertyData = neoHookeanProperty.GetPropertyData(Name="Neo-Hookean")
    curveFit = neoHookeanPropertyData.CreateCurveFitting(
        Type="Neo-Hookean",
        Definition="")
    uniaxialProperty = neopreneRubber.GetProperty(Name="Uniaxial Test Data")
    curveFit.AddTestData(TestData=uniaxialProperty)
    biaxialProperty = neopreneRubber.GetProperty(Name="Biaxial Test Data")
    curveFit.AddTestData(TestData=biaxialProperty)
    shearProperty = neopreneRubber.GetProperty(Name="Shear Test Data")
    curveFit.AddTestData(TestData=shearProperty)
    volumetricProperty = neopreneRubber.GetProperty(Name="Volumetric Test Data")
    curveFit.AddTestData(TestData=volumetricProperty)
    curveFit.RemoveTestData(TestData=uniaxialProperty)
    curveFit.AddTestData(TestData=uniaxialProperty)
    curveFit.Solve()
    curveFit.CopyCoefficients(Destination=neoHookeanPropertyData)
    curveFit.Delete()

Delete

Deletes a curve fitting.

Example

The following example loads a material with experimental test data and a Neo-Hookean hyperelastic property.

    template = GetTemplate(TemplateName="EngData")
    system = template.CreateSystem()
    engineeringData = system.GetContainer(ComponentName="Engineering Data")
    neopreneRubber = engineeringData.ReadMaterial(
        Name="Neoprene Rubber",
        Source="Hyperelastic_Materials.xml")
    neoHookeanProperty = neopreneRubber.GetProperty(Name="Neo-Hookean")
    neoHookeanPropertyData = neoHookeanProperty.GetPropertyData(Name="Neo-Hookean")
    curveFit = neoHookeanPropertyData.CreateCurveFitting(
        Type="Neo-Hookean",
        Definition="")
    uniaxialProperty = neopreneRubber.GetProperty(Name="Uniaxial Test Data")
    curveFit.AddTestData(TestData=uniaxialProperty)
    biaxialProperty = neopreneRubber.GetProperty(Name="Biaxial Test Data")
    curveFit.AddTestData(TestData=biaxialProperty)
    shearProperty = neopreneRubber.GetProperty(Name="Shear Test Data")
    curveFit.AddTestData(TestData=shearProperty)
    volumetricProperty = neopreneRubber.GetProperty(Name="Volumetric Test Data")
    curveFit.AddTestData(TestData=volumetricProperty)
    curveFit.RemoveTestData(TestData=uniaxialProperty)
    curveFit.AddTestData(TestData=uniaxialProperty)
    curveFit.Solve()
    curveFit.CopyCoefficients(Destination=neoHookeanPropertyData)
    curveFit.Delete()

GetChartData

Returns a generated graph data for the specified source data.

Valid source data are:

Material Property

Material Property Data

Return The graph data for the specified source data.
Type Dictionary<string, Object>

RemoveTestData

Removes test data from a given curve fitting.

Required Arguments

TestData The test data property to add.
Type DataReference

Example

The following example loads a material with experimental test data and a Neo-Hookean hyperelastic property.

    template = GetTemplate(TemplateName="EngData")
    system = template.CreateSystem()
    engineeringData = system.GetContainer(ComponentName="Engineering Data")
    neopreneRubber = engineeringData.ReadMaterial(
        Name="Neoprene Rubber",
        Source="Hyperelastic_Materials.xml")
    neoHookeanProperty = neopreneRubber.GetProperty(Name="Neo-Hookean")
    neoHookeanPropertyData = neoHookeanProperty.GetPropertyData(Name="Neo-Hookean")
    curveFit = neoHookeanPropertyData.CreateCurveFitting(
        Type="Neo-Hookean",
        Definition="")
    uniaxialProperty = neopreneRubber.GetProperty(Name="Uniaxial Test Data")
    curveFit.AddTestData(TestData=uniaxialProperty)
    biaxialProperty = neopreneRubber.GetProperty(Name="Biaxial Test Data")
    curveFit.AddTestData(TestData=biaxialProperty)
    shearProperty = neopreneRubber.GetProperty(Name="Shear Test Data")
    curveFit.AddTestData(TestData=shearProperty)
    volumetricProperty = neopreneRubber.GetProperty(Name="Volumetric Test Data")
    curveFit.AddTestData(TestData=volumetricProperty)
    curveFit.RemoveTestData(TestData=uniaxialProperty)
    curveFit.AddTestData(TestData=uniaxialProperty)
    curveFit.Solve()
    curveFit.CopyCoefficients(Destination=neoHookeanPropertyData)
    curveFit.Delete()

Solve

The curve fitting module will solve for the coefficients which most nearly approximate the experimental test data.