Mechanical properties, strength physics and plasticity

Effect of graphene platelets pullout from ceramic matrix on the fracture toughness of ceramic/graphene composites

S. V. Bobylev<sup>ab

a</sup> Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, Russia
^b Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia

Abstract: A theoretical model is proposed that describes the effect of graphene platelets pullout on the fracture toughness of ceramic/graphene composites. The dependences of fracture toughness on the graphene concentration and the dimensions of graphene platelets are calculated using a yttria-stabilized zirconia (YSZ)/graphene composite as an example. Calculations predict that if graphene platelets pullout from ceramic matrix is the dominant mechanism, then the maximum fracture toughness is achieved in the case of the longest and thinnest possible graphene platelets, provided that the latter have sufficient strength and adhesion to the matrix. The model shows a good correlation with experimental data at low graphene concentrations.

Keywords: composites, graphene, ceramics, cracks, fracture toughness.

DOI: 10.21883/FTT.2022.06.52400.306

Bibliographic databases:

•