Below are the fracture surfaces of three different materials

Below are the fracture surfaces of three different materials under SEM. Which one could be a brittle material with trans-granular failure? (A) (B) (C) (D)

Solution

probably - (A)

cause-

  fracture that follows the edges of lattices in a granular material, ignoring the grains in the individual lattices. This results in a fairly smooth looking fracture with less sharp edges than one that follows the changing grains.

A transgranular fracture follows the grains in the wood, not the edges of the puzzle pieces. This is opposed to an intergranular fracture.