Transgranular fracture

A Transgranular fracture is a 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.

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Transgranular fractures are similar to wooden jigsaw puzzle pieces with the grains showing, but with each piece having grains running in a different direction. An intergranular fracture follows the edges of the puzzle pieces, ignoring the grains in the wood.

This is opposed to an intergranular fracture.