The rate-dependent fracture toughness of silicon carbide- and boron carbide-based ceramics

In search of amorphization-resistant boron carbide

“…Numerous characterization techniques, such as TEM [2,7], Raman spectroscopy [4,[12][13][14], photoluminiscence [14], FTIR [14], EELS [2], and neutron scattering [3], have been employed to observe the structure of the amorphized region. The consequences of amorphization include reduced ballistic performance [2], loss of hardness under dynamic loads [14][15][16], post-HEL softening [1], and change in electrical properties [10]. In recent years, advances in atomistic modeling [17][18][19][20][21] have shed additional light on amorphization as well.…”

Ceramics based on reactively sintered boron carbide

“…Зависимость σизг от содержания свободного кремния (а) и температуры РС (б). Составы: • -1; ▔ -2; + -3; ■ -4; ▲ -5; ◆ -6; * -7 [23] подробно исследован К 1с образцов керамики на основе B 4 C и SiC. Показано, что К 1с образцов РКБ увеличивается с ростом содержания Si, причем эта тенденция имеет предельное значение содержания Si (≌30 об.…”

Inelastic deformation micromechanism and modified fragmentation model for silicon carbide under dynamic compression

“…The split-Hopkinson pressure bar (SHPB) experiments and subsequent analysis of measured strain waves have been investigated to accurately determine bulk dynamic stress-strain responses of ceramic materials [6,16]. A large portion of research focused on the phenomena in the microscopic scale such as micro-crack initiation and propagation that account for macro-cracking and fragmentation in the final fracture [3,7,10,[17][18][19][20]. The micro-crack propagation is significantly affected by the heterogeneities such as inclusions.…”

“…The loading rate plays a crucial role in the failure process for a specific ceramic material [1,9,10,[22][23][24]. The fracture mode in ceramics can be intergranular, transgranular or a combination of both, depending on intrinsic heterogeneities and extrinsic loading rates [8,10,20,22,[25][26][27]. The size of fragments collected in dynamic impact tests often follows a statistic distribution, and is strongly affected by the strain rate; the fragment size reduces with the increasing strain rate [7,10].…”