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coupled analysis with umat

Dear all,

I want to do coupled analysis(pore fluid/stress) in abaqus. I use a umat subroutin for define my material (that is soil). other hand I want to use void ratio in permeability. I define permeability in material but I want to use void ratio in my subroutin and the void ratio can changed and dont be constant during run. Do anybody know, how can I changed void ratio with my variables defined in umat?

Of course, I tried to use user field variables, but in window of Pearmibilty there isnt icon of "number of field variables" and I couldnt define "field" for void ratio.

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anisotropically in "GEOSTATIC" step (with distortion error)


I simulated an isotropically triaxial test with 550000 (Pa) pressure on top and side of model in "geostatic" step. I defined vertical predefined field stress 550000 and lateral coefficient 1 too. I didnt have probloms in that model and the results were right.

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WindowsSdkDir not found

Dear all,

I was using Intel Visual Fortan Compliler 11.1 with Visual Studio 2008 pro and Abaqus 6.12 to write and use subroutines in Abaqus. I had linked it properly and it was working fine before. However, today when I tried to use it, the Intel Visual Fortran compiler command window comes with an additional message that "WindowsSdkDir not found", and my subroutines are not working anymore. and when I run it, I get following erorr

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The UMAT problem with no strain and stress


I have written a UMAT subroutin. When I run, the job completes succssefully. But when I try to see results from the ODB files, I get the following error:

"The selected primary variable is not available in the current frame for any elements in the current display group"

I have tried to select the stress, strain and magnitude and all not available. Could anybody help me?

Thanks in advance for your help.

Best regards,

atefe.geramian's picture

keywords error in vumat

Dear all,

     I constructed a VUMAT subroutine which including 4 state dependent variables, so I wrote "*Initial Conditions, Type=Solution" in keywords. But, when I run the simulation I get this error:

in keyword *PERMEABILITY, file "Job-vumat2.inp", line 102: The keyword is misplaced. It can be suboption for the following keyword(s)/level(s): material


Analysis Input File Processor exited with an error.

    Could anybody help me? Thanks a million.

    I copy my keywords as follows.

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