It is shown that stress intensity factors (SIF) can be prescribed in mechanical tests by using digital image correlation. A priori resolutions are validated with a posteriori results. A cascade controller is implemented to prescribe SIF histories. A proof of concept is shown when testing a cracked elastomer. A tensile experiment is nally analyzed with a center cracked sheet made of commercially pure titanium. The linearity error is shown to be less than one order of magnitude higher for the closedloop system when compared to the SIF resolution. However, it is still small compared to the SIF ranges investigated herein.