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

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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Accepted answers

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?

All comments

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?

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.

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.

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.

And a screenshot of the *.log file.

Everything runs smoothly.

I hope this helps.

Kindly,

Ioannis Makris