Implementing 'ELAS_HYPER' in MODELISATION='AXIS'?

lIlIl

ELAS_HYPER laws cannot be used in AXIS mode (v15.4.0).

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║ <EXCEPTION> <ELASHYPER_97>                                                                     ║
║                                                                                                ║
║ La loi de comportement ELAS_HYPER ne peut pas être utilisée avec le modèle AXIS.               ║
║  Modèles                                                                                       ║
║ disponibles: 3D, 3D_SI, C_PLAN, D_PLAN                                                         ║
╚════════════════════════════════════════════════════════════════════════════════════════════════╝

Would it be difficult to implement? Is it because the calculation of invariants, or the change of variable to integrate in cylindrical coordinates is not implemented?

I would like to know which source files should be modified to enable it (ELASHYPER_97 is mentionned in hypela.F90).

lIlIl

It seems like the shortest way is to use MFront. ELAS_HYPER corresponds to the Signorini model, and MFront materials work in AXIS.
https://thelfer.github.io/tfel/web/signorini.html

AsterO'dactyle

Hello,

In the last versions (v17.1), the hyperelastic law with viscosity has been implemented in MFront that's ELAS_HYPER_VISC. It should be work with AXIS models.

lIlIl

Thank you! So far I'm using Signorini.mfront and apart from the WARNING: size of deformation gradients: 5 != nbval: 9 everything works fine.