ERROR : TIME STEP LESS OR EQUAL DTMIN FOR SOLID ELEMENTS

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello, everyone.

I am a new student using Hyperworks 11.0 Block Format to make thermal buckling simulation.

I always meet this error below.

ERROR : TIME STEP LESS OR EQUAL DTMIN FOR SOLID ELEMENTS

What does this error mean?

I used MAT1 ELAST and P14_solid for Property.

When I checked the HEAT_input in the MAT1, this error will occur.

I need thermal expansion to make model buckled. I need /HEAT/MAT and /THERM_STRESS/MAT.

So I think I have to check the HEAT_input. Is this right?

Could you tell me what cause this problem?

Thank you so much.

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2015

    Hi,

    Have you included any ANIM/DT card in your model?

    in the <filename>.out file you should see the time step value and solid element IDs, based on that time step value can you increase the number in the ANIM/DT and check if you get the same?

    if you still get the error, please share the files with us.

    use the dropbox ID below to share the files.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2015

    Dear PrakashPagadala

    Thank you for your always kind help.

    But I still get the same error ( TIME STEP LESS OR EQUAL DTMIN FOR SOLID ELEMENTS) , even I have increased the ANIM/DT.

    I checked the <filename>.out file. I found the mistakes below.

    WARNING id : 758
    ** WARNING IN FORMULATION FLAG (SOLID)
    SOLID FORMULATION 24 IN PID 1
    IS ONLY COMPATIBLE WITH 8-NODE HEXAHEDRON,
    SOLID FORMULATION HAS BEEN CHANGED TO DEFAULT;

    What does this mean? Where is the mistake?

    I want to make thermal expansion to cause a plate to buckle.

    I set just a part of the plate for a high temperature.

    I used MAT1 and the keywords HEAT/MAT. I also used the imposed temperature.

    There must be something here but I do not know.

    The dropbox ID you told me to upload the file is available in my Internet.

    Could you tell me other ways to give you my <filename>.out file?

    Thank you so much.

    Best wishes.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2015

    the solid element formulation used in Property with ID 1 (Isolid in PROP/SOLID) is compatibile with 8 node hexa elements but not with 10 node tetra or any other elements and this was switched to default.

    do you have /DT in your engine parameters? compare that value with the DT value in .out file. if the /DT value provided in engine is more than DT value in out file, then drop the /DT value below the DT value from .out file

    please use the link below to share the engine .out file (filename_0001.out)https://ftin.india.altair.com:8443/filedrop/~BDR1DN

Categories