SimCenter Forum

Meanwhile, the tool is working for me. However, I am not getting the expected results.

The goal of my task was to determine the parameters of the Pinching04 model to achieve the same hysteresis behavior as in my experimental attempts. For this purpose, Bayesian Calibration or Deterministic Calibration can be chosen.

However, I am not obtaining the desired results. In the attachment, you will find the comparison with the test results.

Do you have any tips on how I can obtain the parameters to achieve these results?

Hi,

thanks a lot for the quick reply.

I corrected the files for the strain and stress values and have the same format as in the example qfem-0018.
I also kept the names of the files "calDataField.csv" and "stress.1.coords".

The only thing i changed in the "matTestAllParamsReadStrain.tcl"-file is the material

uniaxialMaterial Pinching4 1 $ePf1 $ePd1 $ePf2 $ePd2 $ePf3 $ePd3 $ePf4 $ePd4 $eNf1 $eNd1 $eNf2 $eNd2 $eNf3 $eNd3 $eNf4 $eNd4 $rDispP $rForceP $uForceP $rDispN $rForceN $uForceN $gK1 $gK2 $gK3 $gK4 $gKLim $gD1 $gD2 $gD3 $gD4 $gDLim $gF1 $gF2 $gF3 $gF4 $gFLim 99999 cycle;

I checked the Initial Points and used the backbone to get values for the "RV".

Unfortunately I get an error again.

EVAL CONCURRENCY: 16
CWD: E:\04_Software\quoFEM\03_Directories\LocalWorkDir\tmp.SimCenter\templatedir
running Dakota:  dakota -input dakota.in -output dakota.out -error dakota.err
RUNNING DAKOTA ERROR:  b''


         dakotaTab.out not found. Response.csv not created.
         -----------------------------------------------------------------------

16:36:20 - Dakota Calibration Processing Results
16:36:20 - No dakotaTab.out file - dakota failed .. possibly no QoI
16:36:20 - Analysis complete

I will put the .txt data in the attachment.

Thanks a lot for your support.