peratures, below the transition where fraetures are 100 pct brittle.2-Within the transition range, the inereased deformation results in strain markings whieh branch out from the notch, and a larger strained area at the bottom of the specimen due to eompressive stresses is obtained. The correspondingly smaller elastically stressed portion is eharacteristic of partially "brittle" fractures within the transition energy range.3-Above the transition temperature, the entire region from the bottom of the specimen to the notch, and a broad area following the contour of the noteh, shows plastic fiow. The 100 pct "ductile" fractures are characteristic of this energy level.
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