A relationship between the fracture mechanics and surface energetics failure criteria

摘要

AbstractThe reversible part of the fracture mechanics (F‐M) fracture energy γcis redefined in terms of current theory for surface energetics (S‐E) interactions at regular interfaces. These new failure criteria are applied to the definition of surface energy criteria for spontaneous interfacial failure, where γc= 0, produced by selected conditions of liquid‐phase immersion. For cases where γc>0, the total fracture energyW= γc+Wp, where the irreversible plastic work of surface formationWp≈W≫ γc. A qualitative relation between γc1/2∝Wpis observed for the case of steady‐state crack propagation in peeling. For adsorption bonds, the theory provides a new method of mapping the surface energy effects of the immersion phase upon the Griffith fracture energy γc. Essential factors which determine water sensitivity of interfacial bonds are incorporated into the analysis and exp