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Calculating material jacobian matrix for ABAQUS UMAT subroutine

Hello everyone, 


I found that there is no comprehensive topic about how to calculate material jacobian matrix for UMAT while it's one of the most complicated and important parts of writing a subroutine and a lot of the researchers deal with it. 

I think it would be great if experts share their sources and experiences here for all. I personally, try to provide the basics and essential materials as well. 

Here is an essential available PDF on Imechanica:

SavanRGowda's picture

Abaqus Fortran Subroutine

Hi Everyone,

I have now managed to run the fortran code, but it won't assign the values that I want to assign to the U(1) variable from the TXT file.

In the attached file I have the Fortran file that I am working on, the input file Subroutine1 (save it as .inp file to open in Abaqus) and the pressure file that contains the nodes and the corresponding pressure values which I want to assign through DISP Subroutine. The code below


SavanRGowda's picture

Abaqus DISP Subroutine

Hi everyone!! 

I am a student studying in Hamburg University of Technology. I am currently doing my thesis and want some help in finishing it. I am finding it a bit difficult to do subroutine in Fortran as I am new to it. I have tried learning from Abaqus Documentation but I didn't get answer to my needs. 

Temperature as a solution dependent variable ???


i am simulating a heat transfer in soil using umatht subroutine.need to specify the variation of the temp as a solution dependent variable??

Anyone have any idea how can i do that in abaqus/cae or is there anyway to do that by editing keyword(indirectly)?

eny help is realy appreciated,

running job in abaqus with user subroutine

Hello evryone,

Im trying to implement subroutine umat and run a job.but im getting this error through  abaqus cae and cmd (attached file),was wondering if anyone could help me out?im using abaqus 6.10 -VS2008-IVF 11 AND successfully run some examples from abaqus verification.i also can send my fortran file ( .for) and input abaqus file for more clarification if you require. any help really apreciated.


Error in look-up table generation: which dataline entries to add?

I am playing a bit with subroutines in Abaqus 6.13 to understand how they work.
At the moment I am using a VUSDFLD to variate the stiffness/density/conductivity in a model (I defined the field variable) depending on Temperature and Position.

It seems that there are not particular errors in the inp file and in the for file, but I got this error in the .sta file:

***ERROR: Internal error in look-up table generation.  Check that dataline
          entries are sufficient to describe the dependence in all independent

Tricky!!! How to read CPRESS(contact pressure) in a subroutine

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I want to set the contact pressure as a input in the routine but I don't know if there is a subroutine allows reading the contact pressure.

Thanks a lot for answering the question!!!

Tricky!!! How to read CPRESS(contact pressure) in a subroutine

I want to set the contact pressure as a input in the routine but I don't know if there is a subroutine allows reading the contact pressure.

Thanks a lot for answering the question!!!

common block in abaqus user subroutine vufield

Dear friends,


I am working on vufiled subroutine for abaqus. I already have a named common block statement in my vfriction subroutine. I need the values from the common block be read in vufield subroutine and passed further / saved to a field variable to be able to plot a contour plot.

Can anyone share his ideas about the coding or have an advice for me?



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