6.3 Test Results
175
Fig. 6.10 Impact crater a schematic, b equivalent diameter determination, c crater volume
determination, reprinted from Peng et al. (2016), copyright 2020, with permission from Elsevier
volumes by blocking the tunnel entrances. Symbol “–” denotes that the data are not
obtained.
Besides, due to the material lost in both craters and tunnel, the initial and residual
masses of the panel in each shot were weighed and listed as M p0 and M pr in Table 6.2.
For the unperforated panels, DOPs were obtained by measuring the distance of the
projectile penetrating trajectory, where the DOP* denotes the penetrations deviated
from the normal direction to some degree. It indicates that, the existence of highstrength basalt coarse aggregates made the terminal ballistic trajectories in most shots
deviated.
However, it should be noted that, aiming to study the influence of UHP-BASFRC
panel thickness on the impact resistance against the small caliber arms, and considering the costs, only a single shooting test was carried out for each combination of
target thickness and fabric.
6.3.3 Perforation Limit
For the given ammunition, like the present API bullet, it is important to determine the
perforation limit (the minimum thickness of the target required to prevent perforation)
for safety design. Figure 6.11 shows the local view of the target rear face in Shot 1-8,
in which the hard steel core of the bullet was stuck with 21 mm-length body exposed
and 6.5 mm-length shank left embedded in the target. However, the composite panels
2-8 and 3-8 with nominal thickness of 80 mm prevented the bullet and had little
damage on rear face except for partly delamination of UHMWPE fabric and little
bulge of CFRP fabric as shown in Figs. 6.6, 6.7 and 6.8.
Therefore, the perforation limit of the present bare UHP-BASFRC panel was
experimentally determined as 77.2 mm, which could provide a certain basis for the
design of UHP-BASFRC walls/panels in protective structures. It also must be pointed
that, more systematic bullet impact tests should be carried out on the UHP-BASFRC
slab with the thickness around 77.2 mm in the future.
175
Fig. 6.10 Impact crater a schematic, b equivalent diameter determination, c crater volume
determination, reprinted from Peng et al. (2016), copyright 2020, with permission from Elsevier
volumes by blocking the tunnel entrances. Symbol “–” denotes that the data are not
obtained.
Besides, due to the material lost in both craters and tunnel, the initial and residual
masses of the panel in each shot were weighed and listed as M p0 and M pr in Table 6.2.
For the unperforated panels, DOPs were obtained by measuring the distance of the
projectile penetrating trajectory, where the DOP* denotes the penetrations deviated
from the normal direction to some degree. It indicates that, the existence of highstrength basalt coarse aggregates made the terminal ballistic trajectories in most shots
deviated.
However, it should be noted that, aiming to study the influence of UHP-BASFRC
panel thickness on the impact resistance against the small caliber arms, and considering the costs, only a single shooting test was carried out for each combination of
target thickness and fabric.
6.3.3 Perforation Limit
For the given ammunition, like the present API bullet, it is important to determine the
perforation limit (the minimum thickness of the target required to prevent perforation)
for safety design. Figure 6.11 shows the local view of the target rear face in Shot 1-8,
in which the hard steel core of the bullet was stuck with 21 mm-length body exposed
and 6.5 mm-length shank left embedded in the target. However, the composite panels
2-8 and 3-8 with nominal thickness of 80 mm prevented the bullet and had little
damage on rear face except for partly delamination of UHMWPE fabric and little
bulge of CFRP fabric as shown in Figs. 6.6, 6.7 and 6.8.
Therefore, the perforation limit of the present bare UHP-BASFRC panel was
experimentally determined as 77.2 mm, which could provide a certain basis for the
design of UHP-BASFRC walls/panels in protective structures. It also must be pointed
that, more systematic bullet impact tests should be carried out on the UHP-BASFRC
slab with the thickness around 77.2 mm in the future.