Impact Damage Analysis of Fiber Reinforced Plastic Structure with Rib

Table 2

Test results I.

Angle	Mass (g)	Energy (J)	The body is cracked after 10 times test	Angle	Mass (g)	Energy (J)	The body is cracked	Strain pulse peak
90°	131	90	2/10	45°	131	90	0/10	0.017
		60	0/10			60	0/10	0.008
		30	0/10			30	0/10	0.008
	90	90	1/10		90	90	0/10	0.025
		60	1/10			60	0/10	0.009
		30	0/10			30	0/10	0.003
	67	90	8/10		67	90	0/10	0.019
		60	2/10			60	0/10	0.011
		30	0/10			30	0/10	0.005
	19	90	5/10		19	90	0/10	0.017
		60	0/10			60	0/10	0.003
		30	0/10			30	0/10	0.003

Note: the strain range of the measuring instrument is −0.035∼0.035. It can be seen from the results in Table 3 that, under several test conditions, the shell was not damaged by the flying stone with small incident angle. When the incident angle was 90°, the shell was more likely to be damaged by the flying stone with medium and large mass. The large mass flying stone has a larger size and can contact at least two ribs at the moment of impact, so the impact energy is more dispersed. Even if the energy is larger, the shell cannot be completely damaged.