Running an input file - spotweld SHELL181 example

This MAPDL example demonstrates how to model spot welding on three thin sheets of metal. Here, the full input file is simply run using the PyMAPDL interface.

Using the following commands, you can directly use an APDL script within a PyMAPDL session with the following commands:

Script initialization

from ansys.mapdl.core import launch_mapdl
from ansys.mapdl.core.examples.downloads import download_example_data

mapdl = launch_mapdl()

Download and run an MAPDL script

spotweld_data = download_example_data(
    filename="spotweld.inp", directory="pymapdl/spotweld"
)
mapdl.input(spotweld_data)

Displacements

# Enter post-processor
mapdl.post1()

# Plot the time step 1.
mapdl.set(1, 1)
mapdl.post_processing.plot_nodal_displacement(cmap="bwr")

# Plot the time step 3.
mapdl.set(1, 3)
mapdl.post_processing.plot_nodal_displacement(cmap="bwr")

Stress

# Get the nodal and element component stress at time step 1.
mapdl.set(1, 1)
nodal_stress = mapdl.post_processing.nodal_stress_intensity()
print("Nodal stress : ", nodal_stress)

# Plot the element stress.
element_stress = mapdl.post_processing.element_stress("int")
print("Element stress : ", element_stress)

The stress at the contact element simulating the spot weld.

Plot the nodal stress in the Z direction.

mapdl.post_processing.plot_nodal_component_stress("z")

Get the cumulative equivalent stress and plot the von Mises stress.

eqv_stress = mapdl.post_processing.nodal_eqv_stress()
print("Cumulative equivalent stress : ", eqv_stress)
mapdl.post_processing.plot_nodal_eqv_stress()

Stop MAPDL

mapdl.finish()
mapdl.exit()