In this case the surfaces of both adherents after debonding will be
covered by the fractured adhesive.The crack may propagate in the
center of the layer or near an interface. For this last case,the cohesive
fracture can be said to be “cohesive” near the interface. The fracture is
adhesive or interfacial when the debonding occurs between the
adhesive and the adherent. In most cases,the occurrence of an
interfacial fracture for agiven adhesive goes along with smaller
toughness of the fracture.