Using digital image correlation to automate the measurement of crack length and fracture energy in the mode I testing of structural adhesive joints

In this study, the crack lengths in adhesively bonded double cantilever beam (DCB) test specimens have been determined using digital image correlation technique combination with an elastic foundation model. This method facilitates continuous measurement of length and offers significant advantages over conventional visual observation including improved accuracy potential for automation. has applied to three joints different structural adhesives, fracture energy Gc values calculated effective by shown be accurate comparison Jc values. Finally, a new is proposed correct that are visually measured standard analysis. scheme improve appreciably.