Snap-back instability of double cantilever beam with bridging

Adhesive bonding community shows a continued interest in using bridging mechanisms to toughen the interface of secondary bonded joints, especially case laminated composites. Due snap-back instability that occurs during fracture, confusions may exist when identifying toughening effect experimentally. The true be overestimated by lumping all energy contributions (kinetic included) an overall effective toughness. Here, fundamentals for enhance fracture resistance are explored through theoretical analysis delamination composite double cantilever beam (DCB) with bridging. Specifically, we establish framework on basis Timoshenko theory and linear elastic mechanics solve response DCB presence discrete phases. We elucidate crack trapping structural propagation. identify contribution toughness observed numerically/experimentally both physical other types dissipation. associated then unveiled. Furthermore, study effects property phases instability, based which, propose dimensionless quantity can deployed as indicator intensity instability. Finally, role geometrical properties, i.e. substrate thickness arrangement spacing phases, macroscopic DCB. This work provides, from point view, essential insight into physics related elements.