Effect of grain boundary sliding on fracture toughness of ceramic/graphene composites

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A model is suggested describing the effect of grain boundary (GB) sliding on the fracture toughness of ceramic/graphene composites. Within the model, GB sliding near the tip of a large mode I crack initiates the formation of a new nano- or microcrack at an adjacent GB. The new crack merges with the pre-existent one, thus providing crack propagation. For the situation where the suggested crack growth mechanism restricts the fracture toughness of ceramic/graphene composites, we calculated the dependence of the fracture toughness on grain size and lateral dimensions of graphene platelets. The calculations demonstrated that GB-sliding-assisted crack growth reduces fracture toughness, and the effect is strongest for the case where grain size is small and the lateral graphene platelet dimensions are close to the sizes of GBs. The results of the calculations agree with the experimental data on the fracture toughness of alumina/graphene composites.

Original languageEnglish
Article number103126
JournalMechanics of Materials
Volume137
Early online date19 Jul 2019
DOIs
StateE-pub ahead of print - 19 Jul 2019

Keywords

  • Ceramics
  • Fracture toughness
  • Grain boundary sliding
  • Graphene

Scopus subject areas

  • Instrumentation
  • Materials Science(all)
  • Mechanics of Materials

Cite this

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title = "Effect of grain boundary sliding on fracture toughness of ceramic/graphene composites",
abstract = "A model is suggested describing the effect of grain boundary (GB) sliding on the fracture toughness of ceramic/graphene composites. Within the model, GB sliding near the tip of a large mode I crack initiates the formation of a new nano- or microcrack at an adjacent GB. The new crack merges with the pre-existent one, thus providing crack propagation. For the situation where the suggested crack growth mechanism restricts the fracture toughness of ceramic/graphene composites, we calculated the dependence of the fracture toughness on grain size and lateral dimensions of graphene platelets. The calculations demonstrated that GB-sliding-assisted crack growth reduces fracture toughness, and the effect is strongest for the case where grain size is small and the lateral graphene platelet dimensions are close to the sizes of GBs. The results of the calculations agree with the experimental data on the fracture toughness of alumina/graphene composites.",
keywords = "Ceramics, Fracture toughness, Grain boundary sliding, Graphene",
author = "Sheinerman, {A. G.} and Morozov, {N. F.} and Gutkin, {M. Yu.}",
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language = "English",
volume = "137",
journal = "Mechanics of Materials",
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}

Effect of grain boundary sliding on fracture toughness of ceramic/graphene composites. / Sheinerman, A. G.; Morozov, N. F.; Gutkin, M. Yu.

In: Mechanics of Materials, Vol. 137, 103126, 01.10.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Effect of grain boundary sliding on fracture toughness of ceramic/graphene composites

AU - Sheinerman, A. G.

AU - Morozov, N. F.

AU - Gutkin, M. Yu.

PY - 2019/7/19

Y1 - 2019/7/19

N2 - A model is suggested describing the effect of grain boundary (GB) sliding on the fracture toughness of ceramic/graphene composites. Within the model, GB sliding near the tip of a large mode I crack initiates the formation of a new nano- or microcrack at an adjacent GB. The new crack merges with the pre-existent one, thus providing crack propagation. For the situation where the suggested crack growth mechanism restricts the fracture toughness of ceramic/graphene composites, we calculated the dependence of the fracture toughness on grain size and lateral dimensions of graphene platelets. The calculations demonstrated that GB-sliding-assisted crack growth reduces fracture toughness, and the effect is strongest for the case where grain size is small and the lateral graphene platelet dimensions are close to the sizes of GBs. The results of the calculations agree with the experimental data on the fracture toughness of alumina/graphene composites.

AB - A model is suggested describing the effect of grain boundary (GB) sliding on the fracture toughness of ceramic/graphene composites. Within the model, GB sliding near the tip of a large mode I crack initiates the formation of a new nano- or microcrack at an adjacent GB. The new crack merges with the pre-existent one, thus providing crack propagation. For the situation where the suggested crack growth mechanism restricts the fracture toughness of ceramic/graphene composites, we calculated the dependence of the fracture toughness on grain size and lateral dimensions of graphene platelets. The calculations demonstrated that GB-sliding-assisted crack growth reduces fracture toughness, and the effect is strongest for the case where grain size is small and the lateral graphene platelet dimensions are close to the sizes of GBs. The results of the calculations agree with the experimental data on the fracture toughness of alumina/graphene composites.

KW - Ceramics

KW - Fracture toughness

KW - Grain boundary sliding

KW - Graphene

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JO - Mechanics of Materials

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