Determination of Material Constants for Crack Size-Dependence Crack Growth Model
A crack size-dependence crack growth model was used to characterise the fatigue crack growth in AL 7075-T6 and AL 2024-T351 alloys. It is shown that the crack growth parameters %K and a can be used to linearise the crack growth in regions I (elastic) and II (plastic) by plotting fatigue data linear-linear da/dN×√a versus %K3, where cubic stress dependency is assumed. A theoretical attempt was made to relate this crack size-dependence fatigue crack growth parameters to the strain-life relationship constants. A reasonably good agreement was achieved when comparing between the theoretical predicted and experimental determined material constants.
Young Won Chang, Nack J. Kim and Chong Soo Lee
U.H. Tiong et al., "Determination of Material Constants for Crack Size-Dependence Crack Growth Model", Materials Science Forum, Vols. 561-565, pp. 2189-2192, 2007