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UMAT subroutine in ABAQUS for elasto-plastic cyclic loadings

I want to implement the elasto-plastic model for cyclic loadings (I suppose
something like chaboche) into the UMAT subroutine in my ABAQUS  model ,
but I haven't enough knowldge for do this. I read some book like mechanichs of solid materials but i don't understand how to implement my constitutive law into the subroutine. until the load is static i don't have many problems, but when i work with cyclic load I'm non able to generate a cyclic increments of plastic behaviou.

Can anyone kindly help me or
post me an example of the subroutine?

I hope my english was sufficient.
Thank you very much
Best regards
Bojan Huljev


Dear Bojan Huljev,

I have your same problem since I would implement in the UMAT or VMAt subroutine the Chaboche elasto-viscoplastic model. Did you received any help pr subroutine example that you can send me?

Thank you


Dear Bojan and Barbara,

I am also working on developing such a subroutine which I can use in ABAQUS. I see that the two of you have faced the same difficulty. Would you consider sharing your UMAT subroutine with me?



Sourabh Shekhar

hii sir i also need help about chabuche viscoplastic model



hii sir i also need help about chabuche viscoplastic model



 Dear all

I´m working in a simple umat damage model to implemented with xfem. In this moment i can simulate the elastic material porperties, but no damage acumulation. Could anyone send me a umat with a simple damage model.



If you are trying to model crack initiation and growth using XFEM, you will probably need to use a UEL subroutine to add this functionality or use the built-in XFEM capabilities of Abaqus 6.9+.

A UMAT subroutine is suitable to implementing damage using material laws, such as through continuum damage mechanics. This is probably not the right subroutine for you if you need a simple XFEM implementation.

Can you provide more details about your problem?   

Thanks for your answer Mike.

 Yes i work with 6.9+. I can realise a crack gronw with xfem in a simple monotonic loading, but, i want to introduce a uniaxial cyclic loading conditions(sine curve load, for example) and introduce a simple UMAT or USDFLD subroutine model to obtain a cyclic loading crack gronw. The UMAT is required to realise a fatigue damage model (Pari´s, chaboche, etc) in XFEM.

  I would like to start with a simple damage model, but i do not know which model could be more appropiate. I have a UMAT that simule a isotropic material and i would like to improve it with a damage model for cyclic loading conditions.


Best Regards

Frank Richter's picture

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Good luck


ciprian.zub's picture


Did u find any UMAT/VUMAT for combined iso-kin hardening (for metal plsticity)?

What about UMAT for steel with yield plateau?

Thanks a lot! 


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