Issue with extraction of equivalent stresses scoped to named selections in Mechanical

Nandhkishore Balaji

I am trying to extract the equivalent stresses using DPF operators, scoped to a nodal named selection. This is a static structural simulation, for the record. For some reason, the extracted fields don't contain any data whatsoever. It lists out the mat and time ids for each node, in the field. But no stress values in the data attribute. Any possible reasons?

def post_started(sender, analysis):# Do not edit this line
    define_dpf_workflow(analysis)

# Uncomment this function to enable retrieving results from the table/chart
# def table_retrieve_result(value):# Do not edit this line
#     import mech_dpf
#     import Ans.DataProcessing as dpf
#     wf = dpf.Workflow(this.WorkflowId)
#     wf.Connect('contour_selector', value)
#     this.Evaluate()

def define_dpf_workflow(analysis):
    import mech_dpf
    import Ans.DataProcessing as dpf
    mech_dpf.setExtAPI(ExtAPI)

    s_eqv_op = dpf.operators.result.stress_eqv_as_mechanical()
    s_eqv_op.inputs.requested_location.Connect('Nodal')
    datasource = dpf.DataSources(analysis.ResultFileName)
    my_model = dpf.Model(datasource)
    s_eqv_op.inputs.datasources.Connect(datasource)

    ns_scope = dpf.MeshScopingFactory.NamedSelectionScoping("BOLT_SHANK_UPPER_1",my_model)
    s_eqv_op.inputs.mesh_scoping.Connect(ns_scope)

    time_freq = my_model.TimeFreqSupport
    nsets =time_freq.NumberSets
    time_scope = dpf.TimeFreqScopingFactory.ScopingBySet(nsets)
    s_eqv_op.inputs.time_scoping.Connect(time_scope)


    dpf_workflow = dpf.Workflow()
    dpf_workflow.Add(s_eqv_op)
    dpf_workflow.SetOutputContour(s_eqv_op)
    dpf_workflow.Record("wf_id",TRUE)
    dpf_workflow.Record("wf_id",True)
    this.WorkflowId = dpf_workflow.GetRecordedId()

Pernelle Marone-Hitz

Before placing your code inside a Python Result object, please test it in the scripting console. That way it'll be easier for you to debug.

Please also refer to this post on how to get started with DPF in Mechanical. It provides an example of what you're trying to do:

Getting started with DPF in Mechanical - Community Forum