Experimental investigation on fractal drilling strength

Article type: Research Article

Authors: Carpinteri, Alberto | Dimastrogiovanni, Luciano | Pugno, Nicola

Affiliations: Department of Structural Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

Note: [] Corresponding author. Tel.: +39 115644902; Fax: +39 115644899; E‐mail: pugno@polito.it.

Abstract: In this paper we present an experimental investigation on fractal drilling strength, theoretically introduced on the basis of the universal fragmentation laws. We focus our attention on impregnated hard grain bit drilling with different base materials, tools and types of control, during steady state or transient condition perforations. Some single scratch tests with abrasive grains or hard material cutting edges, complete the analysis. A very strong size‐effect on classical drilling strength emerges. On the other hand, the fractal drilling strength can be considered as a size‐independent property. A comparison between classical and fractal approaches is thus presented.

Journal: Strength, Fracture and Complexity, vol. 2, no. 1, pp. 1-10, 2004