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*** ERROR # 4903 *** TABLES1 bulk data entry ID=1 has a segment that corresponds to zero or negative hardening.

User: "Theo_21327"
Theo_21327
Altair Community Member
Updated by Theo_21327

Hi All,

I used SimLab 2022 to follow the tutorials "OS-SL-T: 1000 Nonlinear Analysis of Rubber Ring" but failed with errors.

The .out is attached below.  ID=1 is the rubber material which is imported from "Rubber_Material.xml" file.

There were 3 error messages during input processing.   The first message is repeated below:      *** ERROR # 4903 ***   TABLES1 bulk data entry ID=1 has a segment that corresponds to zero or   negative hardening. Make sure that x-value in TABLES1 entry is stretch ratio,   not engineering strain (stretch_ratio = 1.0 + engineering strain).     *** Run terminated because of error(s) in the input data.

After reading the file, I found that I can use " PARAM, CHECKMAT,NO" to bypass, but I did not find this in the "PARAM". Only "CHECKEL,NO" can be found in "PARAM".

 NOTE # 1599  3 stability-related material property errors found. To bypass checking  these errors use PARAM,CHECKMAT,NO. This may, however, cause zero or negative  pivots and excessive compliance.

Does anyone know how to sort out the errors?  I appreciate your help in advance.

Regards

Theo

Rubber_Material.xml
Rubber_Ring.gda
rubber_Ring.out

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    User: "Adriano_Koga"
    Adriano_Koga
    Altair Employee
    Accepted Answer
    Updated by Adriano_Koga

    hi,

     

    usually this is related to the slope of your material curve. It should be always increasing. Can you review your material curve?

    User: "Theo_21327"
    Theo_21327
    Altair Community Member
    OP
    Updated by Theo_21327

    hi,

     

    usually this is related to the slope of your material curve. It should be always increasing. Can you review your material curve?

    Hi Adriano,

    Thanks.

    I reviewed the curve and changed it. It is successful now.

    User: "Brian_20847"
    Brian_20847
    Altair Community Member
    Updated by Brian_20847

    Hi Adriano,

    I still have this error. I checked my material curve, it alwasys increase. Can you help me?

    Beside in Rubber_Material.xml has engineering stress-strain curve but .out file contain both OptiStruct stress. What is this.

    Thanks.

    image

     

    User: "Ioannis_Makris"
    Ioannis_Makris
    Altair Employee
    Updated by Ioannis_Makris

    Hello Brian,

    I took a look at your file. The reason behind this error is the first row of your data for the three tables you specify.

    Delete the first row --> Stress 1, Strain 0 and everything runs smoothly.

    Attached there is a simple model with your material.

    image

    And a screenshot of the *.log file.

    image

    Everything runs smoothly.

    I hope this helps.

    Kindly,

    Ioannis Makris

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