Mode I fracture toughness prediction for multiwalled-carbon-nanotube reinforced ceramics

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Abstract

Eshelby-Mori-Tanaka models with a continuum damage mechanics approach are developed to predict the elastic damage and fracture toughness of multiwalled-carbon-nanotube (MWCNT) reinforced ceramics as a function of MWCNT fraction. This damage model is introduced in a modified boundary layer modeling approach to predict damage accumulation leading to crack propagation from a pre-existing crack tip in a process window where damage and fracture are captured under plane-strain Mode I loading. The model is validated against experimental fracture toughness data for a MWCNT 3-mol% yttria-stabilized zirconia composite and successfully predicts the observed saturation in fracture toughness at about 25% volume fraction MWCNTs.

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Nguyen, B. N., & Henager, C. H. (2015). Mode I fracture toughness prediction for multiwalled-carbon-nanotube reinforced ceramics. Engineering Fracture Mechanics, 147, 83–99. https://doi.org/10.1016/j.engfracmech.2015.08.013

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