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ANSYS Coupled Thermal-Structural Analysis Fails After Adding Anand Viscoplastic

- May 7, 2026 at 3:56 pm
  
  dasaret.bakillari
  Subscriber
  
  I am running a coupled transient thermal/structural analysis of a power electronic package consisting of several layers. For each layer, I defined the required thermal and mechanical material properties.
  When I run the analysis without the Anand viscoplastic model, the simulation completes successfully. However, as soon as I assign the Anand model to one of the layers (die attach/solder layer), the solver fails with errors related to undefined material properties.
  Initially, I received errors related to the thermal property KXX for elements belonging to the layer where the Anand model was assigned. I then tried using two separate engineering data sets: one for the transient thermal analysis (without Anand) and one for the transient structural analysis (with Anand enabled). In that case, the thermal analysis runs, but the structural analysis fails with errors related to missing mechanical properties such as EX.
  Has anyone experienced similar issues when using the Anand viscoplastic model in coupled thermal-structural analyses in ANSYS Mechanical?
  If it helps, I am using Workbench 2024 R2

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