Abstract
Ductile-brittle transition of the material fracture is studied in terms of the fractal dimension measured on the fractured surface. The tensile fracture tests are conducted for notched round bar specimens made of carbon steels. The notch radius and the carbon content of materials are changed to produce the ductile-brittle transition in the fracture. The fractal dimension is correlated with the absorbed energy. Two distinct regions appear in the plots of fractal dimension vs. absorbed energy : the fractal dimension for brittle fracture surface varies with observing scale, while that for ductile fracture remains almost constant. The variation in fractal dimension for brittle fracture surfaces can be interpreted by the size effect of brittle fracture.
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