How to extract Joint Forces in Mechanical using DPF.?

Naveen Kumar Begari

I want to get joint force reactions using dpf.

Naveen Kumar Begari

@Pernelle Marone-Hitz
@Ayush Kumar
@George Tzortzopoulos
@Rajesh Meena
could you please help me?

Ayush Kumar

@Naveen Kumar Begari joint forces can be extracted as SMISC forces. You need to scope the joint element id. Below is an example code for for the IronPython API.

import mech_dpf
import Ans.DataProcessing as dpf
mech_dpf.setExtAPI(ExtAPI)

#Get data source
dataSource = mech_dpf.GetDataSources(1)
my_model = dpf.Model(dataSource)
my_elemental_scoping = dpf.MeshScopingFactory.ElementalScoping([2431])

joint_force_x = dpf.Operator("mapdl::smisc")
joint_force_x.Connect(4,dataSource)
joint_force_x.Connect(1,my_elemental_scoping)
joint_force_x.Connect(10,1)
jf_x_fields = joint_force_x.GetOutputAsFieldsContainer(0)
jf_x_field = jf_x_fields[0]

Naveen Kumar Begari

Thanks @Ayush Kumar

Naveen Kumar Begari

@Ayush Kumar
Here, Forces along X directions are getting in 'Newtons-(N)' , where as Forces along y and z directions are showing unit system in 'mJ' units instead of 'N' units but the values are same. Can I get help over here.?

As well as, In the below script, what are those numbers 4,1,10,1 digits represents.

Ayush Kumar

@Naveen Kumar Begari sounds like a bug. If the values are correct you can force set the units of field by field.unit = "N"
Please report this on GitHub so that this bug can be reviewed and correct.
https://github.com/ansys/pydpf-core/issues

Naveen Kumar Begari

@Ayush Kumar Thank you...!!

Rohith Patchigolla

Just to add to the solution, the below code can be used to directly extract the joint element id from the Joint object (using the name) in Mechanical Tree.

analysis = DataModel.AnalysisList[0]
solution = analysis.Solution

jointObj = DataModel.GetObjectsByName("Fixed - 3blocks\Solid1 To 3blocks\Solid")[0]
jointElemId = solution.SolverData.GetObjectData(jointObj).ElementId

Naveen Kumar Begari

@Rohith Patchigolla Thanks for alternate solution.