Figure 16 -- A biface under dynamic loading conditions. The red represents the loading time of 0.0002 seconds. The blue is one cycle of free response (0.001418 seconds) of the core after the crack initiates. At the beginning of the free response, notice the core continues in the same direction it was moving during the loading time. This biface is 3 inches wide by 1.0 inches thick and fixed at the edge opposite the platform. These measurements yield a width-to-thickness ratio of 3.