Fatigue Crack

Noun
1. a crack in metal resulting from metal fatigue
(hypernym) crack, cleft, crevice, fissure, scissure

crique de fatigue

(met) fisură datorită oboselii
  

ترک خستگي

A fracture starting from a nucleus where there is an abnormal concentration of cyclic stress and propagating through the metal. The surface is smooth and frequently shows concentric (sea shell) type markings with a nucleus as a center. Fatigue cracks which penetrate the OD surface of the tube body are incorrectly referred to as "pinholes".