Brittle or Quasi-Brittle Fracture of Ceramic Nanocomposites Under Dynamic Loading

Skripnyak, Evgeniya G.; Skripnyak, Vladimir A.; Skripnyak, Vladimir V.; Skripnyak, Natalia; Vaganova, Irina K.

doi:10.7712/100016.1819.11114

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…Self-organization process of micro-damages and occurrence of mesoscale shear cracks were observed in the ceramic nanocomposites under compression at high strain rates. These results are in agreement with data obtained in [20,21]. Tensile stress gradients occurring in the region, where unloading waves interact, are most dangerous for nanocomposites.…”

Section: Resultssupporting

confidence: 91%

Modeling of Mechanical Behavior of Ceramic Nanocomposites

Vaganova

Skripnyak

2015

AMM

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Deformation and damage occurring at the meso-scale level in structured representative volumes (RVE) of modern nanocomposites in wide loading conditions were simulated. The computational models of a structured RVE of ceramic nanocomposites were developed using the data of structure researches on meso-, micro -, and nanoscale levels. The critical fracture stress on meso-scale level depends not only on relative volumes of voids and inclusions, but also on the parameters of inclusion clusters. The critical fracture stress at the meso-scale level depends not only on relative volumes of voids and strengthened phases, but also on sizes of corresponding structure elements. In the studied ceramic composites the critical failure stress is changed non-monotonically with growth of the volume concentration of strengthening phase particles. At identical porosity, concentration of nanovoids in the vicinity of grain boundaries causes the decrease in the shear strength of nanostructured and ultrafine-grained ceramics. It is revealed that the occurrence of bimodal distributions of the local particle velocity at the meso-scale level precedes the nucleation of microcracks. At mesoscale level of ceramic nanocomposites the pressure and particle velocity distribution don’t display a resonance behavior under submicrosecond single shock pulse loading or repeated pulse loadings.

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Section: Resultssupporting

confidence: 91%

Modeling of Mechanical Behavior of Ceramic Nanocomposites

Vaganova

Skripnyak

2015

AMM

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“…So that macroscopic dynamic failure of porous nanostructured ceramics is associated with multiple physical processes. The study of fracture mechanisms of nanostructured ZrB 2 -based UHTC was carried out by the method of computer simulation [6,14,15].…”

Section: Mechanical Engineering Automation and Control Systemsmentioning

confidence: 99%

“…The use of nanopowders of ultra-high temperature compounds can reduce the temperature of the pressing and reduce the size of pores in ceramics. Results of multilevel modeling show that the fracture of nanostructured ceramic materials under dynamic loading can be quasi-brittle [6,7]. Dynamic fracture toughness of nanostructured ultrahigh temperature ceramic materials is higher compared with coarse-crystalline counterparts.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Simulation of Porous Quasi-Brittle Ceramics Fracture

Skripnyak

Vaganova

et al. 2015

AMM

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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.

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Brittle or Quasi-Brittle Fracture of Ceramic Nanocomposites Under Dynamic Loading

Cited by 2 publications

References 12 publications

Modeling of Mechanical Behavior of Ceramic Nanocomposites

Modeling of Mechanical Behavior of Ceramic Nanocomposites

Multiscale Simulation of Porous Quasi-Brittle Ceramics Fracture

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