Help on umat

[lazywood]

Hi. I have got an old umat file and I am trying to run it. It seems working fine and I got the result of those field output variables defined in ABAQUS input file. However, I did not get any state dependent variables defined in umat file. Could somebody help me to figure out what's going on here? I am not an expert on ABAQUS and I know this might be a trival problem to you.

Sam

[Jorgen]

You can plot state variables as a field output if you first save them to the odb-file by specifying SDV as an output field variable in the input file (or in CAE).

- Jorgen

[lazywood]

I have specified E, S, SDV in input file and it is still running without yielding any of the above results.

[lazywood]

I specified sdv for field output. But I got a warning message in DAT file:"WARNING: DATABASE OUTPUT IS NOT CURRENTLY AVAILABLE FOR COMPOSITE SOLIDS. " My element type is C3D8, is there any problem with this?

Sam

[Jorgen]

If you are running a simulation that is using a UMAT and you specify a SDV as an output variable, then I would think you should be able to create a contour graph of the state variables. I have not heard of that warning message before. Do you know what the "COMPOSITE SOLIDS" part is referring to?

- Jorgen

[lazywood]

Solid composite is one kind of element for composite materials. Abaqus dose not support output SDVs defined on element to .odb. The only thing I can do now is try to use postprocessing techniques to either access .fil or combine .fil with .odb. Abqaus tehcnicians have provided me a buntch of codes to write .fil to .odb. However, I still have some problems to compile them. To be exactly, I can compile them but not able to link them. If I have solved issue, I would like to post them up.

[Jorgen]

Are you saying that "Solid composite" is an element type in ABAQUS, like C3D8R is an element type? I don't quite follow :confused: