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.