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Clean break. This photo shows a cross section of timber that has been snapped in two pieces. The break appears clean, the edges where the wood is splintered is smooth and compact, giving the impression that the two pieces could be reunited quite easily.
Atypical behavior. This photo shows a cross section of timber. Instead of a clean break, the wood has fractured along the grain lengthwise in virtually all spots along the piece of timber. The entire beam is splintered and frayed, broken in many pieces, as if exploded rather than snapped.
FHWA-HRT-05-096
