Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Fracture lines at front corners, after ten shocks, shock waves from right. b Separation of front corners and fracture lines at rear surface (Hopkinson), after 15 shocks, shock waves from right. c Separation of rear surface layers at a distance of approximately 3 mm and further separation of front material, after 16 shocks, shock waves from right. d Multiple small fragments are generated after 23 shocks, shock waves from right
