Fig. 4: Fracture behaviors of a pre-crack-containing sample under mode-I loading (KII = 0), where the pre-crack aligns with the zigzag direction. | Communications Materials

Fig. 4: Fracture behaviors of a pre-crack-containing sample under mode-I loading (KII = 0), where the pre-crack aligns with the zigzag direction.

From: Experimentally measuring weak fracture toughness anisotropy in graphene

Fig. 4

a Crack paths predicted for different values of θZ with R = 0.94. b The first crack deflection θ in panel a at x = 20 μm. The results show that the angle θ − θZ is a constant in each of the three regions I–III, which are spaced by 30∘. c The next-preferred edge cleavage after the first deflection, plotted as a function of R and KII/KI at the crack tip. The conditions corresponding to crack advancing along the zigzag direction and without kinks in panel (a) are annotated as the white segment of the solid line plotted for R = 0.94.

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