CURVE FITTING HYPERELASTIC MATERIAL

- December 11, 2019 at 11:46 am
  
  m.caragiuli
  Subscriber
  
  Hello,
  
  I have to run the simulation of a hyperelastic material subjected to a force. I have uniaxial tension and compression experimental data and I want to use the nonlinear Ogden model regarding the material. Since the Ogden 1st order doesn't fit properly, is it correct to use a 2nd order Ogden model to represent the hyperelastic material? I know Ogden is expressed in terms of principal stretches, since uniaxial data involve the stretching and compression along one principal stretch direction I'm not sure if a second order could be applied. It seems that during curve fit solving using a 2nd order ogden, the estimated constants are quite similar to each other.
  
  What do you think?
  
  Thanks!

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