Select the creep model based on available experimental data.

For better results, the stress/strain rate and temperature range of the application should fall within the considered experimental data range. Using too much additional experimental data outside the required range also leads to more complexity in finding material constants and reduces accuracy within the desired range of strains. Engineering judgment is therefore necessary to select an experimental data range for curve fitting.

Because the curve-fitting procedure is a numerical technique for obtaining material constants without considering the physics of the material model, material model knowledge is required to judge the constants obtained from curve fitting in order to avoid solution inconsistency.

Provide accurate experimental test data to obtain valid curve-fitting results.