Abstract
The S-N curves of plain specimens seem to be controlled directly by the small-crack growth law, because the fatigue life of plain specimens is occupied mainly by the propagation life of a small crack. In this paper, the relation between the small-crack growth law, dl/dN=Cσnal, and S-N curves is investigated, and it is shown that the constants n and C1 of the small-crack growth law are determined approximately by the equations n=β and C1=[ln(d/5)+6]/C0, if the S-N curves can be approximated by the relation σβaNf=C0 (d: specimen diameter). The validity of this method is checked through its application to the present experiments and other researchers' S-N curves.
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