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