3.1 Fatigue life results
Detailed test results are listed in Table 3. The logarithmic means of
fatigue lives of specimens 1-2 and 3-5 were used as Nf1and Nf2, respectively. It can be seen that the residual
cycle life was improved, especially when the preload cycle life fraction
is 0.5. It should be noted that the virgin specimens 3-5 show a narrow
life scatter band under high-amplitude loading. Therefore, the inherent
dispersion of fatigue life is insufficient to explain the increased
residual life.
Table 3 Fatigue test results of
FGH96