Error # 4966 *** minimum time increment reached, analysis aborted.

MelZ
MelZ Altair Community Member
in Community Q&A

Hi, I have this error when running my analysis.

*** ERROR # 4966 ***
Minimum time increment reached,
analysis aborted.

I tried to adjust the minimum time increment from 5e+06 to 5e+07, but the analysis took the entire night to run only 0.5%. And in the *nl.out flie, it shows the analysis failed with "element distortion". Does anyone know how to solve this problem? Appreciate any help and thank you!

image.png

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Answers

  • Rajashri_Saha
    Rajashri_Saha
    Altair Employee

    Hi,

    The error is happening due to element distortion as you can see the element ids are printed. You can find those elements and see what is happening there, maybe you need to check the contact definition if any contact is defined in that area.

    Thanks

    Rajashri

  • MelZ
    MelZ Altair Community Member
    https://community.altair.com/discussion/comment/187419#Comment_187419

    Hi, yes, there are contact surfaces on these distortion elements. I used PCONT contact type. And if I keep my PCONT setting like this

    image.png

    The model won't even converge at the first load increment and give me "*** ERROR # 4965 ***
    Maximum number of time increment cutbacks reached,
    analysis aborted". So I tried to change the PCONT setting into the following

    image.png

    the model failed at the load step 1.0, and has "*** ERROR # 941 ***
    NON-CONVERGENT NONLINEAR ITERATIONS FOR SUBCASE 1".

    From the *nl.out file, it seems like the contacts weren't interact with each other as it supposed to be since the open contact number kept 972 for all the increments.

    image.png

    Do you know what is the problem and how to fix it? Thanks

  • Rajashri_Saha
    Rajashri_Saha
    Altair Employee

    This is definitely contact issue.

    If it is large displacement analysis, then keep DISCRETE=S2S and TRACK=CONSLI.

    You can go through the below article to know more about troubleshooting of NL convergence and apply the methods mentioned in the article.

    https://community.altair.com/community?id=kb_article&sys_id=a6b1eafedbfd4d10cfd5f6a4e2961906

    Try using CNTSTB in loadstep if you have not used yet.

  • MelZ
    MelZ Altair Community Member

    Thanks! I will take a look at the article

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