Isight with abaqus: target doesn't decrease

[NEROOO]

Hi,

I'm using Isight to fit the experiment curve by changing the material constants, however, the "sum of squared difference" remains the same, and actually I followed step by step from the tutorial.

Need your help! Thanks a lot!

 

[FEA way]

Which tutorial have you followed ? Maybe you made some small mistake in the setup.

 

[NEROOO]

@FEA way
Do you have any suggestions?

I use .cae as input and .odb output. Target value and simulation value are both read from the .txt file. The optimization part I use Hooke-Jeeve, to minimize the sum of squared difference...