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Load with increasing vertical displacement is shown in (A) for samples containing 0 and 3 wt % capsules. Effect of capsule content on fracture toughness is presented in (B) (average ± SEM, n = 5). Fracture plane roughness and subsurface microcracking are observed in SEM images of the side views of samples containing (C) 0 wt % and (D) 3 wt % capsules. Direction of crack propagation is indicated by arrows.
