“Only linear and rigid equations of state are valid for shells”

“Only linear and rigid equations of state are valid for shells” – Error ACP-Explicit coupling ?

- June 10, 2020 at 6:53 am
  
  Mjaiman
  Subscriber
  
  I am trying to conduct a Carbon Fibre helmet assembly drop test using explicit dynamics autodyne solver and getting the following error message- "Only linear and rigid equations of state are valid for shells".
  
  The helmet has two parts - Shell (ACP) and polyurethane foam (Ogden 3rd Order Hyperelastic material model). I have coupled the systems as shown in the picture below.
  
  Please if anyone has come across this error let me know what I might be pursuing wrong?
  
  Here is the solver output message:
  
  "
  
  License acquired!
  Checking model setup.....Please wait
  Generating External Faces ...... please wait
  Initializing.....Please wait
  ERROR! Cannot run problem. Invalid equation of state with SHELLS.
  Valid equations of state for SHELLS are:
  Linear and
  Rigid
  Cannot run problem. Invalid failure model with SHELLS.
  
  Valid failure models for SHELLS are:
  
  None
  Plastic Strain
  Principal Stress
  Principal Strain
  Principal Stress/Strain
  User failure #1
  Finished model setup with errors...
  
  "
  
  I tried suppressing failure constants for composite materials but did not find any success.

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