Abstract
The pheonomenological equation of the dynamic fracture for the brittle materials was derived making use of the results of the lumped mass spring model of the crack. We have used this equation to qualitatively analyze the effect of crack acceleration on the K1-a relation and the fractured surface roughness obtained by Takahashi and Arakawa [Exp. Mech., 27 (1987), 195], where the quantities K1 and a are the dynamic stress intensity factor and the velocity of the crack, respectively. The implication of this phenomenological equation on the theory of the dynamic fracture is also discussed.
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