Experimental Research on the Low Velocity Impact Damage of CCF300/QY8911 Composite Laminates
A group of low-velocity impact tests on CCF300/QY8911 composite laminates were implemented by the low-velocity drop hammer test machine. The dent depth and the internal damage pattern with corresponding impact energy were studied, the internal delamination damage state of laminates after impact were observed through thermal layer exposing tests, and the mechanism of low-velocity impact delamination damage were discussed. The results indicated that there existed a significant inflection point in the curve of impact energy verse dent depth of CCF300/QY8911 composite material, which was also the transition point of different damage patterns. When the impact energy was smaller than the inflection energy, the damage pattern consisted mainly of matrix flaws and delamination damages, but when the impact exceeded the inflection energy, delamination damage hardly expanded while the expansion of damage was mainly fiber break.
B. Xu and H.Y. Li
H. M. Hong et al., "Experimental Research on the Low Velocity Impact Damage of CCF300/QY8911 Composite Laminates", Advanced Materials Research, Vol. 583, pp. 179-182, 2012