Abstract
The stretch zone is an intermediate fracture surface between the end of the fatigue precrack and the beginning of the crack produced by monotonic loading in a fracture toughness test. The appearance of this zone, ductile like the fatigue precrack zone, is distinguished by a more hilly relief and more elongated dimples and its width is related to the crack opening displacement (COD). Considering a blunt crack symmetric relative to the original line of the fatigue precrack, an equation relating stretch zone width (W{sub SZ}) to COD ({delta}{sub c}) can easily be established. In the present work, applying the technique to a series of peak-aged Al-Zn-Mg alloys has been attempted.
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