5. CONCLUSION
The neat and nanocomposite Ti/APC-2 hybrid laminates were fabricated. Two types of symmetrical and anti-symmetrical double-edge-cracked specimens were made. The crack lengths were 2.0 mm and 3.0 mm and inclined angles θ = 30°, 45°, and 60° for symmetric samples andθ = ±30°, ±45°, and ±60° for anti-symmetric samples. All the specimens were subjected to tensile tests and cyclic tests separately to obtain the load-displacement curves and the mechanical properties, and the P-N curves and fatigue lives, respectively.
The longer the crack lengths are, the lower the properties and lives are. Similarly, the higher the inclined angles are, the lower the properties and live are. The enhancement of adding nano-powder did improve the mechanical properties, but not significantly. The mechanical properties and fatigue lives are better for anti-symmetric samples than those of symmetric samples. The failure mechanisms of small elliptical broken pieces were found due to cyclic loading for both kinds of FMLs.