Neo-hookean model in FEAPpv?

[K.Li]

Dear Prof. Taylor and FEAPpv users,

I read about the Neo-Hookean and Modified Neo-Hookean Models in the FEAPpv Manuel, then I found the implementation of Compressible neo-Hookean model in the neoh3f(...) subroutine of the \ver31\elements\material.f file. However, I was not able to find any subroutine calling the neoh3f(...) subroutine to use this model in the FEAPpv code? Can you please advise and help?

[Prof. R.L. Taylor]

The FEAPpv manual has been made from an edit of the FEAP manual and there are probably some errors.  In this case you found one.  FEAPpv only has NEOH and STVK for large deformation models -- no plasticity, viscoplasticity, etc.  There is a user interface.  See the routines modlsd.f and modlfd.f in the ./elements directory for actual models included.

[K.Li]

Dear Prof. Taylor:

Thank you very much for your quick reply!  Now I understand.

I also noticed that only the variable 'xlamd' is needed in order to add the Modified Neo-Hookean model in the neoh3f(...) subroutine to FEAPpv. Will it be possible to implement that to FEAPpv with a reasonable amount of time?   

[Prof. R.L. Taylor]

The parameters are still there to keep the interfaces between FEAP and FEAPpv the same.  These are for augmenting usually.  We have no plans to add models to FEAPpv -- that is for users to do through the user interface.

[K.Li]

Thank you again for the information, Prof. Taylor!