How can we check if analysis is linear or nonlinear?

Pernelle Marone-Hitz

How can we check, through scripting, if the analysis is linear or nonlinear?

Pernelle Marone-Hitz

The following function checks:

• whether a plastic material law exists in the model (other forms of material nonlinearity is not included)

• whether nonlinear contacts are defined

• whether large deflections are turned on

    def LinearNonlinearAnalysis(analysis):
        '''
        Check whether analyis is linear or nonlinear and identify source of nonlinearity
        '''
        listExportNonLinearAnalysis = []   
        # test whether model is static or dynamic
        analysis = GetAnalysis()
        analysisType = analysis.AnalysisType
        # test whether model is linear or nonlinear
        ## test material properties to check for plasticity
        import materials
        existsPlasticity = False
        matList = ExtAPI.DataModel.Project.Model.Materials.Children
        for mat in matList:
            dataMat = mat.GetEngineeringDataMaterial()
            dataList = materials.GetListMaterialProperties(dataMat)
            plasticityList = ["Isotropic Hardening", "Kinematic Hardening"]
        test = [ele for ele in dataList if (ele in plasticityList)]
        existsPlasticity = bool(test)
        ## test for nonlinear contacts
        connections = ExtAPI.DataModel.Project.Model.Connections
        nonLinearContactTypeList = [
            ContactType.Frictional, ContactType.Frictionless, ContactType.Rough
        ]
        contactList = []
        existsNonLinearContacts = False
        for contGroup in connections.Children:
            for cont in contGroup.Children:
                if cont.Suppressed is False:
                    try:
                        contactList.append(cont.ContactType)
                    except:
                        pass
        test = [
            ele for ele in contactList if (ele in nonLinearContactTypeList)
        ]
        existsNonLinearContacts = bool(test)
        ## test for large deformations
        existsNlgeom = analysis.AnalysisSettings.LargeDeflection
        ## checking nonlinearity of model
        existsNonLinearity = False
        nonLinearityList = [
            existsPlasticity, existsNonLinearContacts, existsNlgeom
        ]
        existsNonLinearity = True in nonLinearityList
        listExportNonLinearAnalysis.append([
            str(analysisType),
            str(existsNonLinearity),
            str(existsPlasticity),
            str(existsNonLinearContacts),
            str(existsNlgeom)
        ])
        return listExportNonLinearAnalysis