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How to code an hysteresis loop in an Abaqus Subroutine ?

How to code an hysteresis loop in an Abaqus Subroutine ?

How to code an hysteresis loop in an Abaqus Subroutine ?

(OP)
Hi everyone,

I have to use an hysteretic friction model. I am trying to code this in Abaqus by using the FRIC subroutine. The language is Fortran 77.

I am testing my code on a very simple model : two plates sliding on eachother. I apply a 1 cycle sinus displacement at the end of one plate and a apply some boundaries at the other side.

My hysteresis loop starts ok, the function I entered in the subroutine is respected, but when the curve has to reverse to the unloading function, Abaqus does not seem to understand which way it has to go. I am new to Fortran and to Subroutines so it surely comes from my code.

I have attached the Fortran file, which can be read in any text editor.

Any help would be very appreciated ! Thanks in advance

Rémi

RE: How to code an hysteresis loop in an Abaqus Subroutine ?

(OP)
Anyone can help please ? I am really stuck here.

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