How to update the engineeringdata in ANSYS LS-DYNA

Akane Ito

In ANSYS Mechanical, the engineeringdata update is performed using the script below.
I would like to do the same in ANSYS LS-DYNA.

import wbjn

model = ExtAPI.DataModel.Project.Model
analysis = model.Analyses[0]
settings = analysis.AnalysisSettings
list_dir = settings.SolverFilesDirectory.rsplit("\\",3)
print list_dir[1]

pyCmd = '''
sys_list = GetAllSystems()
for sys in sys_list:
    comp = sys.GetComponent("Setup")
    strDir = comp.GetEntityProperty("DirectoryName")
    sysName = str(sys.Name)
    if (strDir == "{0}"):
        print(sysName)
        break
system1 = GetSystem(Name=sysName)
engineeringData1 = system1.GetContainer(ComponentName="Engineering Data")
material1 = engineeringData1.GetMaterial(Name="構造用鋼")
matlProp1 = material1.GetProperty(Name="Density")
matlProp1.SetData(Variables=["Density"], Values=[["7880 [g cm^-3]"]])
'''.format(list_dir[1])

wbjn.ExecuteCommand(ExtAPI, pyCmd)

ExtAPI.DataModel.Project.Model.RefreshMaterials().Model.RefreshMaterials()

ram27x

Hi @Akane Ito ,

I believe that the material parameters defined at the Workbench (project) level are inherently read-only from Mechanical. Wouldn’t it be simpler and more robust to parameterize the Young’s modulus and density at the Workbench level, and then only update the parameter values from Mechanical?

You can use to insert command snippet method to target the insertion of commad snippet to a Target matrial name here it is Air and ARG1=3 helps to derive values from the Inout Arguments or you can hard code them in the mat_card

# Get all bodies

geometry = ExtAPI.DataModel.Project.Model.Geometry

listBodies = geometry.GetChildren(DataModelObjectCategory.Body, True)


# Define material card


mat_card = """*MAT_024

$#     mid       rho       e       pr       ber     r1     r2     r3

         1      ARG1    ARG2      0.3

$#     sigy      etan      fail     tdamp      ix     iz    iq     is

      ARG3

"""

# Find body with material name "Structural Steel"

for body in listBodies:

    mat = body.Material

    # Get material name - try both string and object approaches

    try:

        mat_name = mat.Name if hasattr(mat, 'Name') else str(mat)

    except:

        mat_name = str(mat)


    if "Air" in mat_name or "AIR" in mat_name.upper():

        cmd = body.AddCommandSnippet()

        cmd.Name="Modified card"

        cmd.Input = mat_card

        break

This approach would avoid the need for extensive string-based matching and workarounds. More generally, injecting project-level (Workbench) commands from within the Mechanical environment is risky, as it relies on implicit assumptions and currently provides no error handling or validation.

Using standard parameterization mechanisms would be safer, easier to maintain, and much less error-prone.

Cheers,

Ram27x