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Error: Mooney-Rivlin constants  (A+B) < 0 from curve fitting

Question asked by Felix Yang on Aug 4, 2020
Latest reply on Aug 7, 2020 by Jay Seaglar

Hello there, 


I was trying to do a nonlinear simulation with Polyurethane material with Model Mooney Rivlin. I got the S-S curve data(uniaxial, biaxial and planar raw data)  from Matereality, but no matter how I tweak the setup, the error message prompts up after I hit Run.


Does anyone know how to fix this error?  Could the material data be possibly incorrect?