The effect of grain-size on fracture of polycrystalline silicon carbide: A multiscale analysis using a molecular dynamics-peridynamics framework

•A new multiscale method was used for examining fracture of polycrystalline 3C-SiC.•The multiscale method coupled molecular dynamics and mesoscale peridynamics.•Fracture strength followed a Hall-Petch like relation.•Fracture toughness increased with grain-size.