Multiscale Simulation of Porous Quasi-Brittle Ceramics Fracture

• DOI: 10.4028/www.scientific.net/amm.756.196
• Publication Date: 2015-04-29T11:59:25Z
• Authors: Vladimir V. Skrip...; Evgeniya G. Skrip...; Vladimir A. Skrip...; Irina K. Vaganova; Anatoly M. Bragov; Andrei K. Lomunov; Leonid A. Igumnov
• Keywords: 02 engineering and technology; 0210 nano-technology

Multiscale computer simulation approach has been applied to research mechanisms of failure in ceramic nanostructured ceramics under dynamic loading. The obtained experimental and theoretical data indicate quasi-brittle fracture of nanostructured ZrB2 ceramics under dynamic compression and tension. Damage nucleation and accumulation in quasi brittle nanostructured ceramics were simulated under impact loadings. Fracture of nanostructured ultra-high temperature ceramics under pulse and shock-wave loadings is provided by fast processes of intercrystalline brittle fracture and relatively slow processes of quasi-brittle failure via growth and coalescence of opened microcracks. For nanostructures ZrB2 ceramics with porosity of 7 %, the compressive strength at strain rate of 1800 s-1 is equal to 2440±50 MPa, the tensile strength at strain rate of 300 s-1 is equal to 155±20 MPa.