Fatigue response of hybrid magnesium/APC-2 nanocomposite laminates at elevated temperature

Abstract

AS-4/PEEK APC-2 nanocomposite laminates and Mg/APC-2 hybrid nanocomposite laminates were fabricated. The mechanical properties and fatigue response of laminates were obtained due to tensile and cyclic tests at room and elevated temperatures. The surface treatment of chemical etching on Mg sheets resulted in strong bonding with APC-2 laminates. The nanoparticles SiO2 of optimal weight were uniformly spread on the faces of APC-2. From the tensile test the mechanical properties, such as ultimate strength and stiffness, of cross-ply APC-2 nanocomposite laminates were found higher than those of quasi-isotropic nanocomposite laminates. The ultimate strength of hybrid nanocomposite laminates was predicted satisfactorily well with experimental data by using the rule of mixtures.As for cyclic tests we received the data of applied stress vs. cycles and plotted the S-N curves. Also, the failure mechanisms were observed. It was found APC-2 quasi-isotropic nanocomposite laminates possessed better fatigue resistance than that of the cross-ply nanocomposite laminates. Through the regression of fatigue data we proposed the semi-empirical model for APC-2 nanocomposite laminates and the theoretical model for hybrid nanocomposite laminates. Both models predicted the results of durability/life in good agreement with experimental data. The theoretical model for hybrid nanocomposite laminates was simple, conservative and precise.