How to change certain Keyoptions only for Solid bodies in my Mechanical model?

Rohith Patchigolla

In my Mechanical model, I have large number of both solid and shell bodies. I would like to change the keyoption(2) --2, for all the solid bodies (linear mesh) to use Enhanced Strain Formulation. I would like to avoid adding 100s of command objects (i.e. under each solid body). Is there an easier way to do this?

Rohith Patchigolla

This can be made easier using Python Code object.

Step1: RMB on Analysis and insert a "Python Code" object
Step2: Add the below code in it, which will extract all the solid bodies and change the keyoption 2 to 2 for each body.

Note: This process will not work if one uses "Material Assignments" in Mechanical

#Execute the below commands only in the First load step.
if solver_data.CurrentStep == 1:
    #Enter /Prep7
    solver_input_file.WriteLine("/prep7")
    solver_input_file.WriteLine("etcontrol,off")
    #Get all bodies and loop over them to change Keyoption 2 to 2 (Enhanced Strain)
    allBodies = DataModel.GetObjectsByType(DataModelObjectCategory.Body)
    solidBodies = [child for child in allBodies if child.GetGeoBody().BodyType == GeoBodyTypeEnum.GeoBodySolid]
    for body in solidBodies:
        bodyTypeNum = solver_data.GetMaterialSolverId(body.GetGeoBody().Id)
        solver_input_file.WriteLine("keyopt," + str(bodyTypeNum) + ",2,2")

    #Enter /solu again
    solver_input_file.WriteLine("/solu")