In this article I will show how you can use a PolyUMod material model with Ansys LS-DYNA in Workbench. The procedure is very straigforward, the (perhaps) only step is that you need to copy the PolyUMod versions of LS-DYNA to the Ansys installation directory. All the details are given below.
Step 1: Create an LS-DYNA FE Model in WB
Create the FE model as you usually do in Workbench.
Step 2: Use MCalibration to Create a Material Model
Create a material model using MCalibration. In this example I’m using the PolyUMod Bergstrom-Boyce model.
Step 3: Export the Material Model
Export the material model to LS-DYNA format.
*MAT_USER_DEFINED_MATERIAL_MODELS $# -- MCalibration defined material model -- start $# Units: [length]=meter, [force]=Newton, [time]=seconds, [temperature]=Centigrade $# Material Model: PolyUMod-Bergstrom-Boyce $# Calibration file name: Untitled $# mid ro mt lmc nhv iortho ibulk ig 1 1e-09 45 25 28 0 14 13 $# ivect ifail it ihyper ieos lmca 0 1 1 1 0 0 $# MM ODE JAC ERRM TWOD_S verb VTIME VELEM 4 0 0 0 0 1 0 0 $# VINT ORIENT NPROP NHIST GMU GKAPPA FAILT FAILV 0 0 25 28 8 5000 0 0 $# mu lambdaL kappa s xi C tauBase m 2 3.5 500 3 0.05 -0.5 0.5 8 $# tauCut 0.01 $# -- MCalibration defined material model -- end
Step 4: Specify the Material Model in Mechanical
Paste in the material model as a command snippet for the relevant part(s).
Step 5: Replace LS-DYNA Executables
This step only needs to be performed one time for each version of Ansys. First, copy the PolyUMod-provided custom LS-DYNA executables to the clipboard. There is one executable for single precision and one executable for double precision.
Then paste the PolyUMod provided LS-DYNA executables into the Ansys installation directory shown below. You may want to rename the existing files as follows before overwriting them with the PolyUMod enhanced versions. Rename
Step 6: Run the FE simulation
Run the FE simulation as usual from within Mechanical. Make sure the Solution Information include the PolyUMod information lines. This proves that Ansys found the PolyUMod version of LS-DYNA.