Fractal characteristics of cracking solids are studied using acoustic emission (AE). The plastic zone size (PZS) for model I fracture has been further redefined according to fractal theory. The relationships between the stress ratio and dimensionless PZS with the fractal dimension are investigated. The results show that the increase in the fractal dimension, the dimensionless PZS constant, will substantially decrease the stress ratio. The semiempirical relationship between fractal AE count and the stress intensity factor (SIF) is studied. The results show that the fractal AE count varied with SIF in the same manner as the Paris law for crack propagation in fatigue. The exponent is a function of the fractal dimension Df. Results by proposed method are compared with the experimental results, and fairly good agreements are observed.
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