Microstructure and properties of Si3N4 foam ceramics modified by in-situ self-grown nanowires

Experimental study on the effect of ceramic properties on failure behavior of composite armor

“…The final surface roughness was less than .03 µm. The measured densities of the ceramic tiles were 3.15, 3.10, 2.52, and 3.79 g/cm 3 , respectively. The other properties of applied ceramic materials are presented in Table 1.…”

“…The failure modes of cores with different properties are different, among which the ductile and low strength cores 11,12 are plastic deformation and erosion, and the failure modes of the core of 12.7 mm API projectile brittle fracture. [13][14][15] The high-strength core material [16][17][18] is made of high-carbon steel after some heat treatment, with a hardness of 62 ± 2RC and a density of 7.85 g/cm 3 . It has obvious tension-compression asymmetry and no obvious tensile-plastic strain in the quasi-static tensile test.…”

“…The backplates were UHMWPE (TeximusSC) .24 24 349−407 23 13.5−14.1 (HV10) 23 3.5−3. laminates reinforced by unidirectional prepreg structures, size 200 mm×200 mm×12 mm, with a density of .97 g/cm 3 . A bi-layer structure was made of a ceramic plate and a UHMWPE laminate bonded together with J-101 epoxy.…”

“…The average characteristic fragment size λ, the average size of fragments d m , and the shape parameter k reflect the size and distribution of ceramic fragments. Equation (3) indicates that the parameter k in the Schumann distribution equation determines the proportion of fragments in different scale ranges. Specifically, the larger value of parameter k corresponds to the greater the proportion of larger-scale fragments.…”

“…Si 3 N 4 ceramics is another outstanding ceramic due to its relatively high fracture toughness. 3,4 Because of brittleness, ceramics must be matched with tough backplates such as metal or high-performance fiber-reinforced polymer composite to improve their protection capabilities. Ceramic composite armor with a metal backplate is commonly used in tanks, armored vehicles, helicopters, and so on.…”