Table 2.

Tests for recreating flattened surface/crack trajectory.

Test No	Anvil	Velocity (m/s)	Crush Depth of Flatten Area (mm)	Recreated Cracks in Tested Helmet *
				1	2	3	4	5	No. of Additional Cracks
1	Flat	5.8	6.2	●	×	●	×	×	2
2	Flat	6.3	6.3	●	×	●	●	×	2
3	Flat	6.9	7	●	×	●	●	●	2
4	Oblique	6.4	2.7	●	×	●	×	×	0
5	Oblique	6.8	6.1	●	×	●	●	●	1
6	Oblique	8	3	●	×	×	×	×	3
7	Oblique	8	3.5	●	●	●	●	×	2
8	Oblique	7.3	5.4	●	●	●	●	●	2
9	Oblique	7.3	5.2	●	●	●	●	●	0
10	Oblique	7.3	5.6	●	●	●	●	●	2

* ● means the crack was recreated while × means not recreated.