On the calibration of the cohesive strength for cohesive zone models in finite element analyses

Cohesive zone models are commonly used to numerically model fracture phenomena on the microscale. Typical processes described experimentally via Double Cantilever Beam (DCB) test and End Notched Flexure (ENF) macroscale. Analytical solutions, e.g. LEFM-based beam theory, evaluate these tests validate numerical models. However, some input parameters of cohesive models, i.e. stiffness strength, independent analytical solutions. In particular, strength has a significant effect accuracy compared solution thus needs be calibrated. This work extends available literature by fitting DCB ENF through calibration their using more suitable generally applicable criteria. It considers deformation, applied load crack length The latter been neglected so far in existing literature. Via parametric study, derived criteria minimised find best fit solution. addition, all element size calibrated is investigated. obtained information can qualify with coarse meshes accurately compute Further, it provides comprehensive understanding as modelling parameter.