Identification of cohesive zone model parameters based on interface layer displacement field of bonded joints

Nowadays, adhesively bonded structures are widely used as structural elements in many engineering fields. The development of approaches for predicting joint reliability and interface layer behavior make adhesives suitable for new and more complex applications. In this paper, a novel identification methodology of cohesive zone model (CZM) parameters, based on the comparison of experimental and numerical relative adherends slip displacements, is proposed and compared with approaches by literature. All considered methods are based on an interface traction-separation law (TSL) whose shape is known a priori. For identification purposes, tests on adhesively bonded joints under Mode II fracture loading were performed using end notched flexure (ENF) specimen. Experimental results in terms of relative adherends tangential slips were obtained by means of digital image correlation (DIC) technique.