Issue 42

M. Vasco et alii, Frattura ed Integrità Strutturale, 42 (2017) 9-22; DOI: 10.3221/IGF-ESIS.42.02 20 Mechanical behavior of pre-corroded reinforcing B500C steel bars: Fatigue results The fatigue behavior of the as-received material at all corrosion exposure periods is illustrated in Fig. 15. Degradation on the fatigue behavior due to the effect of corrosion especially at the high and medium stress levels is observed. 10000 100000 1000000 1E7 200 250 300 350 400 450 500 550 600 650 Stress (MPa) Cycles As received As received_30d As received_60d As received As received_30d As received_60d Figure 15 : Fatigue results of the as-received material at all corrosion exposure periods. The effect of sandblasting on the fatigue behavior for the longest corrosion exposure period is presented in Fig. 16. An improved fatigue life at the low regime stress levels is observed. The values of the fatigue limit obtained by the Weibull function are given in Tab. 8. An increase of 11.6% is observed for the fatigue limit of the sandblasted material as compared to the as-received one at this corrosion exposure period. 10000 100000 1000000 1E7 200 250 300 350 400 450 500 550 600 650 Stress (MPa) Cycles As received_60d Sandblasted_60d As received_60d Sandblasted_60d Figure 16 : Fatigue results of the as-received as well as the sandblasted material at all corrosion exposure periods. NB SB 0 days 270.95 NA 30 days 301.35 NA 60 days 268.86 300.07 Table 8 : Fatigue limit (MPa).