Scaling effects on the creep crack growth behaviour are investigated by analyzing the results of compact tension (CT) tests on different-sized notched steel specimens appearing in the literature. Creep crack growth rate data are correlated to the elastic stress-intensity factor in terms of a Paris-type law, da/dt=C_0 K^q, where C_0 turns out to be a crack-size dependent coefficient of proportionality. Considering specimens with the same loading configuration (CT) and the same thickness, the observed crack-size effect on the creep crack growth rate is discussed on the basis of self-similarity considerations, and geometrically interpreted in terms of fractal tortuosity of the crack profile. A size-independent formulation of the creep crack growth law correlating renormalized quantities is finally deduced and confirmed by the experimental results.
Fractal scaling and crack-size effects on creep crack growth / Carpinteri, Alberto; Niccolini, Gianni; Rubino, Alessio. - In: STRENGTH, FRACTURE AND COMPLEXITY. - ISSN 1567-2069. - ELETTRONICO. - 13:3(2020), pp. 1-131. [10.3233/SFC-200260]
Fractal scaling and crack-size effects on creep crack growth
Alberto CARPINTERI;Gianni NICCOLINI;Alessio RUBINO
2020
Abstract
Scaling effects on the creep crack growth behaviour are investigated by analyzing the results of compact tension (CT) tests on different-sized notched steel specimens appearing in the literature. Creep crack growth rate data are correlated to the elastic stress-intensity factor in terms of a Paris-type law, da/dt=C_0 K^q, where C_0 turns out to be a crack-size dependent coefficient of proportionality. Considering specimens with the same loading configuration (CT) and the same thickness, the observed crack-size effect on the creep crack growth rate is discussed on the basis of self-similarity considerations, and geometrically interpreted in terms of fractal tortuosity of the crack profile. A size-independent formulation of the creep crack growth law correlating renormalized quantities is finally deduced and confirmed by the experimental results.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/2857120