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SEM images of the fracture surface of broken specimens after their flexural strength tests at 100-times magnification. Different fracture surface shapes appeared depending on the material properties. A cleaner fracture surface was observed on the relatively brittle PICN specimen when compared with the FMLB and NXT specimens. Fatigue crack lines were often observed at the fracture surface of PLC samples with high elasticity. (A) FMLB, (B) NXT, (C) PLC, and (D) PICN.
