An Estimation Study on Fatigue transition Life of Nanocomposites Reinforced by AL2O3
The behaviors of 2024Al/Al2O3 nanocomposite which wes fabricated by stir casting at 450r.p.m and casting temperature of 850oC have been examined under four points loading of rotating bending. fatigue test at room temperature (RT), humidity of 40% and fully revers stress ratio (R=-1).The trend of the fatigue properties obtained from the experimental tests showed an improvement in the fatigue strength and life compared to the metal matrix 2024Al alloy. The S-N curves were obtained and the equations of the nanocomposite which described the constant S-N curves were established based on Basquin power law equation for 0.2, 0.4, 0.6, 0.8 and 1.0wt. % Al2O3. The experimental results analysis revealed that the fatigue strength of nanocomposite are improved by 0.53%, and the fatigue transition life is increased by 16.02% compared to the metal matrix.