General Mechanical

General Mechanical

hyperelastic material instability

    • m.caragiuli
      Subscriber

      Hello,


      During the fitting of uniaxial experimental data using a hyperelastic material model (Ogden) I managed to get an optimal fitting of the curve. However, during the solution in the Solver Output a message appears reporting the instability of the material as follows:


      material instability


      and I can see that convergence is challenging and it is very time-consuming.  I don't understand the reason for the material instability. Do you have any ideas? How can I solve this issue?


      I would be grateful to receive your feedback.


      Many thanks.


       

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