(a)
(b)
(c)
(d)
Figure 5: SHPB compression test response of FG/PU and FG/PU/VACNT composites evaluated over strain rate of 700 to 800/s: (a) stress-strain curve of FG/PU and FG/PU/VACNT, (b) compressive strength, (c) average specific energy absorption, and (d) rate of specific energy absorption.