A dislocation model of the fatigue fracture of ductile metals was proposed. Two parallel unlike rows of edge dislocations in the slip planes 10A or less distant from each other can have a chance to meet in a slip band during the cyclic stressing and to produce a long void with a rectangular cross-section by the annihilation of the leading dislocations, which will, then, grow into a long flat void sufficient to generate a fatigue crack by absorbing dislocations successively. It was shown that this dislocation model was fit for interpreting available experimental facts on the fatigue fracture of ductile metals
