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problem using crystal plasticity model in Abaqus via UMAT

I am trying to model polycrystal behaviour using Abaqus Umat via crytalplasticity . My Umat results for single crystal & about 5 grain, are reasonable, but when, I try to use more than 5 grain in each integration point  (polycrystal model) abaqus aborted with following message after about 15 increment:

Abaqus Error: The executable C:\SIMULIA\Abaqus\6.10-1\exec\standard.exe aborted with system error code 693...

 

I will be happy if someone guide me about this problem.

Comments

Hi,

System error code appears if you are passing variables which abaqus couldnt read. Generally by division of zero, mismatch in array sizes in stress or DDSDDE etc.. In your problem, once you are using more than 5 grains, I guess that some variable may be reaching infinity. check in this direction.

Hope this helps,

Rohith

  
thanks, I will try

Dear shapoor

I am writing a UMAT for cyclic plastic material and I meet the same problem as you have mentioned. Could you please tell me how to deal with the problem.

Thank you very much!

The executable F:\SIMULIA\Abaqus\6.10-1\exec\standard.exe aborted with system error code 693. Please check the .dat, .msg, and .sta files for error messages if the files exist. If there are no error messages and you cannot resolve the problem, please run the command "abaqus job=support information=support" to report and save your system information. Use the same command to run Abaqus that you used when the problem occurred. Please contact your local Abaqus support office and send them the input file, the file support.log which you just created, the executable name, and the error code.

Dear Rohith

Thanks for your guid, but I cannot find the error source. If you can send me a benchmark, I mean the simple problem with 

the values of variables like STRESS, in some increment, for a problem with few element (2 or 3) and few grain in each integration point in 2D FEM, I will be able to compare my UMAT results with that of yours, and it certainly helps.

Shapoor 

Hi,

     I dont work in crystal plasticity. I just answered your query based on my previous experience. When I say DDSDDE, STRESS they are just examples. But error codes generally come if there is something wrong in your UMAT. You need to check all variable declarations and also there values using WRITE statements, this is the only possible solution

regards,

rohith

Set debug modulas in Microsoft Visual Studio, referring to a blog in the imchanica.

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