Abstract
Experiments were conducted on tensile fracture of a phenol-formaldehyde cast resin. Room temperature and elevated temperature fracture data was obtained and the surface energy to extend the fracture was calculated thereby. In addition, the surface was studied by optical and scanning electron photomicrographs. The ambient temperature results indicated a surface energy of the fracture far above theoretical bonding energies. It is postulated that this energy is due to molecular motion during the re-establishment of equilibrium at the free surfaces formed by the fracture.
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