Theoretical Research Progress in High-Velocity/Hypervelocity Impact on Semi-Infinite Targets

Table 2

The critical velocity ignoring the target material strength.

Materials	g/cm^3	GPa		GPa	(1) m/s	m/s	m/s	(2) m/s
Tungsten alloy [74]	17.3	291.7	0.3	2.4	1490–1666	1046	821	645
Steel 4340 [42, 43, 74]	7.85	170.8	0.3	1.978	2008–2245	1186	932	869
Aluminum alloy 6061 [42, 43, 74]	2.71	67.65	0.33	0.625	1929–2148	1228	999	832
Concrete [103]	2.4	15.625	0.18	0.0619	643–718	736	510	278
Granite [104]	2.67	36.87	0.16	0.1822	1045–1168	1095	743	452