Creep modelling, can't replicate input data
I have the creep curve from a tensile test. The data is used in the APDL-module to extract the constants for Modified Time Hardening using the curve fit functionality.
When I use the constants with the modified time hardening creep model the fit to the experimental data is quite good.
I then use the creep constants to define a modified time hardening material in Ansys where I run a simulation on a cube with friction less support on 3 sides and the same pressure used for the test data. This setup ensures uniaxial loading. The outcome should be the same as the input. It is not. I have tried to perform this simple test numerous times in different versions of Ansys but with the same result.
The entire setup made in Workbench 2019 R2 is attached.
If anyone has similar issues or even an explanation I will be grateful.