Calculation of Creep Strain Rate

  • Last Post 02 April 2020
Patti posted this 09 August 2019

Good morning,

I got test data from a creep test (Creep Stress, Creep Strain, Isochronous Stress-Strain-Diagramm, Creep Moduls).

Now, I am trying to fit these data to a suitable creep equation, using Creep Curve Fitting with ANSYS MAPDL to generate necessary coefficients.

Most of the creep models require the Creep Strain Rate. Actually I don't know how to get these Information, maybe someone can give me a tip?

Thanks in advance.



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peteroznewman posted this 09 August 2019

Hello Patrick,

In this post, I show the Norton equation for creep strain rate, which is an output, not an input.


gopikrishna posted this 02 April 2020

sir, can you please explain how to find the creep constants for norton model in ansys


peteroznewman posted this 02 April 2020

Setup an experiment in the lab with a physical sample with known sample geometry (cross-section and length), and a known load, then with precision instrumentation, track the change in length vs. time.  Fit the creep model to this experimental data and you will get the creep constants. 

ANSYS provides curve fitting software that takes the experimental data and does the nonlinear curve fitting of the model to the data to provide the creep constants.