Abstract

HILDERS, Oswaldo. Fractal fracture mechanics micro and nanoscale effects part I: Toughness and microscale mechanisms of fracture. Rev. Fac. Ing. UCV [online]. 2011, vol.26, n.4, pp.55-80. ISSN 0798-4065.

The fractal nature of fracture surfaces in metallic alloys is discussed on the basis of the present investigation and some previous results for seven aluminum alloys and three stainless steels. Four aluminum alloys were of the 7000-series; two of the 2000-series and the Al-0,57Si-2,03Ge alloy. Two stainless steels were austenoferritic: the duplex SAF 2205 and the superduplex SAF 2507. The other stainless steel was the austenitic 304 type. The relation between the fracture mechanisms, fractal dimension and mechanical properties, particularly toughness; is explained from some of the current empirical and theoretical models, whereas the main methods for fractal characterization of metallic fracture surfaces were reviewed. The results related with the observed changes in toughness, roughness and fractal dimension are discussed and it is shown that the higher the toughness the rougher the fracture surface, which is related with an increase in fractal dimension. Fractal dimension values depend on the method of experimental measurement, but show the same general trend.

Keywords : Fractal Dimension; Fracture Mechanics; Toughness; Fracture Toughness; Fractography.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )