4. Model calibration

Model calibration, or the identification of model parameters, is a very important step in achieving predictive results. In the past, a single tensile test was sufficient to identify the parameters of a damage model, but we now realize that this is not enough, as it only reflects damage for a very specific stress state. What's more, the use of local observables (stricture measurements, displacement field measurements by image correlation) are very useful as a complement to global observables such as the force-displacement curve. In the first section, we'll look at how to vary test types and specimen geometries to cover the most varied and representative stress states possible. We will then present the identification methodologies associated with the different families of damage criteria/models.