02 04 06 08 10 12

Figure 14.9. Comparison of engineering solutions for quarter circular (law [7]

is very close to the Bowie case of a through crack. In this area, test results showed that eq (14.7) is very useful [II]. It is likely that in this regime Liu's solution overestimates the stress intensity.

In an example to compare the equations for the case of fatigue crack propagation, Wanhill [8] calculated fatigue crack growth lives from crack data obtained with centre cracked specimens. For titanium alloy IMI 550 at a maximum stress of 295 MN/m2, and a cycle ratio R = 0.05. the results are presented in figure 14.10.

0 0

Post a comment