Mooney Rivlin Error

- April 2, 2024 at 11:56 am
  
  Akshay Maniyar
  Ansys Employee
  
  Hi Harry,
  Can you share more details about the issue? As per the image attached, it looks like the curve fitting is not giving proper coefficients for the Mooney-Rivlin model. Do you have test data for a given material? Did you try other hyperelastic material models? Please check the below video on curve fitting and see if it helps.
  How to Perform Curve-fitting for Hyperelastic Material Models — Lesson 1 - ANSYS Innovation Courses
  Thanks,
  Akshay Maniyar
- April 2, 2024 at 6:28 pm
  
  Harry Begy
  Subscriber
- April 3, 2024 at 10:14 am
  
  Akshay Maniyar
  Ansys Employee
  
  Hi Harry,
  Are you using the material from the Ansys database or do you have any test data for the material you want to use? Also, what type of Analysis are you doing? As per the error message, it looks like you need some material property data which is not defined in your material definition.
  Thanks,
  Akshay Maniyar
- April 3, 2024 at 3:19 pm
  
  Harry Begy
  Subscriber
  
  I am using static structure and the materials used in Ansys database.
- April 4, 2024 at 10:21 am
  
  Akshay Maniyar
  Ansys Employee
  
  Hi Harry,
  I tried using the Mooney-Rivlin 5-parameter material model and it properly fits the test data. Also, tried to run a demo model with this material and it worked. Please try and let me know if it helps.
  Thanks,
  Akshay maniyar
- April 4, 2024 at 4:09 pm
  
  Harry Begy
  Subscriber
  
  Thank you . so you mean Mooney Rivlin 2 parameter does not work? I will try 5 parameter hoping to have a proper result.
- April 11, 2024 at 1:54 pm
  
  Harry Begy
  Subscriber
- April 11, 2024 at 1:55 pm
  
  Harry Begy
  Subscriber
- April 11, 2024 at 5:48 pm
  
  Harry Begy
  Subscriber
  
  The same error ! Any suggestions?
- April 12, 2024 at 6:20 am
  
  michelle crouch
  Subscriber
  
  I’m grateful. You’re saying that the Mooney Rivlin 2 parameter isn’t functioning? I’ll attempt five parameters in the hopes of getting the right outcome candy clicker .
- April 12, 2024 at 7:03 pm
  
  Harry Begy
  Subscriber
  
  Yes, neither Mooney Rivlin 2 parameter nor the 5 parameter are working for me. all the coefficients have been curve-fitted.

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