Abstract
In the near-threshold region of the fatigue crack growth, the amount of crack growth per cycle is in atomistic scale. This may suggest that the near-threshold fatigue crack growth is controlled by atomistic scale events. In previous papers the molecular dynamics was applied to the simulation of near-threshold fatigue crack growth. In this study, the influence of grain boundary on the near-threshold mode I fatigue crack growth behavior in BCC-iron was investigated using the molecular dynamics method. When the grain boundary existed perpendicular to the crack plane, the grain boundary served as an obstacle to crack growth. When dislocations got through the grain boundary, gratin boundary had small influence.KeywordsNear-threshold fatigue crack growthBCC ironMolecular dynamicsFracture mechanicsGrain boundary
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