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UMAT : Gurson-Tvergaard-Needleman model

I try to program the GTN model in a UMAT with isotropic hardening and anisotropic Hill yield criterion. I just want to know if someone has an example of UMAT dealing with the original GTN model (Von Mises criterion). This example would help me a lot in order to compare my code and perhaps to find my mistakes. 


I had seen that there is an existing thread called "sharing Abaqus UMAT and VUMAT subroutines" but I didn't find what I want in the discussion. I just saw that a GTN UMAT will probably not be given for free. I understand that it's precious but perhaps someone could give me a little help.


thanks in advance



Have  you finished your  UMAT  procedure  about GTN?I am also programing   the GTN model in a UMAT with  the kinematic  hardening .

Yes, my efforts have paid and my UMAT finally works... but it was difficult. Many attempts and doubts before the victory.

 I wish you the same result with kinematic hardening. I can give you some help if you want (and if I am capable of :-). If you have questions about mechanic or fortran programming, I'll try to answer. I would be interested in introducing kinematic hardening in my UMAT because I study metal sheets undergoing first tensile test and then bending test. So, your experience may be profitable.


Pandi.Pitchai's picture

Hi Premalin,

Could you please send me the sample of UMAT code for the GTN model.I am new for UMAT, It will be greateful to beging my work .

Thanks in advance;



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