%I Springer 
%O Proceedings of the 16th European Conference of Fracture, Alexandroupolis, Greece, July 3?7, 2006
%T Correlation Between Paris? Law Parameters Based on Self-Similarity and Criticality Condition
%P 239-240
%R 10.1007/1-4020-4972-2_117
%B Fracture of Nano and Engineering Materials and Structures
%L eprints1942
%D 2006
%X Fatigue crack growth data are usually presented in terms of the crack growth rate, da / dN, and the stress-intensity factor range, ?K. The typical fatigue crack propagation curve is shown in Fig.1, where Region I is referred to as the near-threshold region, Region II as the power-law region and Region III as the rapid crack propagation region where K max ? K IC and crack growth instability occurs. In Region II the Paris? equation (Paris and Erdogan [1]) provides a good approximation to the majority of experimental data: (1) dadN=C(?K)m
where C and m are empirical constants usually referred to as Paris? law parameters.
%A Alberto Carpinteri
%A Marco Paggi