Experimental Study on the Impact Resistance of Closed-Cell Aluminum Foam Protective Materials to RC Piers under Lateral Impact

Table 4

Impact testing scheme.

Number of impacts	Height of the drop hammer (m)	Boat weight (kg)	Axial pressure (KN)	Weight of the drop hammer (kg)	Theoretical velocity (m/s)	Measured average velocity (m/s)	Energy accumulation (J)
1	0.7	1200	25	216	0.77	0.76	606
2	1				0.93	0.96	1574
3	1.5				1.14	1.14	2939
4	2				1.32	1.32	4768
5	2.6				1.50	1.54	7258
6	3.5				1.74	1.76	10511
7	4.5				1.97	1.98	14627
8	5.5				2.18	2.21	19756
9	6.6				2.39	2.43	25956