Hi, I am solving a finite viscoelastic problem. The second PK stress tensor for the material is given as [image] where C1e and C1oe are material stiffness parameters, C is right Cauchy-Green deformation tensor. C can be decomposed into an elastic, Ce, and an inelastic part, Ci. So in the equation…

Thank you so much for your help. I found the issues. First of all, there is something wrong in the time-dependent equation of Ci. Thus, instead of second PK stress tensor and Ci, I used Cauchy stress and elastic part of left Cauchy-Green deformation tensor, Be. Now the constitutive equations are […

Issues with a viscoelastic problem

variational formulation

swatisharmapanda June 4, 2020, 4:27pm 3

Yes, I have tried a hyperelastic problem. For a hyperelstic probelm, Fenics solution matches exactly with the analytical solution.

See this: Incompressible Humphrey hyperelastic material in Fencis

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Issues with a viscoelastic problem

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