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<strong>Fracture</strong> Energy BalanceThe total energy change in the medium dueto a dislocation is given by the Volterrarelationship:From the principle of energy conservation,the energy partition at the rupture frontshould satisfywhere E h is the heat, E k the kinetic energy,E u the elastic energy, E γ (or G) the fractureenergy and E m the mechanical energy(Husseini, 1977).Both members of this equation representthe available energy to move the crackEach term is given as follows:
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