Griffith-Orowan fracture mechanic

One of the purposes of this paper is to differentiate between surface free energy and fracture surface energy. Thus, several basic principles of fracture mechanics are discussed with reference to the Griffith s energy-b J nce concept and the Irwin-Orowan s plastic-zone concept. We also define several frequently misused terms, e.g., effective fracture surface energy, fracture energy and fracture toughness. Actual values of related parameters are presented to illustrate the applicability of fracture mechanics to the selection of polymers for structural materials. 

Because of the importance of failure phenomena in any consideration of multicomponent polymer systems, a brief review of the energetics and mechanics of fracture follows (Andrews, 1968, 1972 Berry, 1961 Broutman and Kobayashi, 1972 Eirich, 1965 Griffith, 1921 Halpin and Polley, 1967 Hertzberg et al, 1973 Johnson and Radon, 1972 Kambour and Robertson, 1972 Krauss, 1963 Lannon, 1967 Manson and Hertzberg, 1973u Mark, H., 1943,1971 Orowan, 1948 Prevorsek, 1971 Prevorsek and Lyons, 1964 Radon, 1972 Riddell et ai, 1966 Rivlin and Thomas, 1953 Rosen, 1964 Tobolsky and Mark, 1971 Williams, M. L., and DeVries, 1970 Zhurkhov and Tomashevskii, 1966). Specific cases are discussed in Sections 3.2 and 12.1.2. 

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