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Molecular dynamics simulation of crack initiation and propagation in bcc iron under load within spur gear tooth root
Author(s) -
Zhao Z.,
Chu F.
Publication year - 2018
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12681
Subject(s) - breakage , root (linguistics) , spur , materials science , enhanced data rates for gsm evolution , molecular dynamics , fracture mechanics , structural engineering , tooth root , work (physics) , mechanics , composite material , computer science , engineering , mechanical engineering , physics , dentistry , medicine , telecommunications , philosophy , linguistics , quantum mechanics
Spur gears are widely used in practice, and one of their typical failures is tooth breakage. In general, the tooth breakage occurs at tooth root, and the amount of crack growth during a meshing cycle is in atomistic scale. This work aims at identifying the mechanisms of crack initiation and propagation at tooth root by using molecular dynamics simulation. The results prove that there are phase transition regions and edge dislocations at crack tips. According to the distribution characteristic of the atomic potential, its concentration can be observed obviously by visualization software. In these concentration regions, microvoids come into being and expand gradually, which results in the subcrack initiation. Additionally, the microvoids and subcracks propagate along the high potential direction and then come together to accelerate the crack growth. Through carrying out a comparative simulation, the effects of heavy load at single meshing area on crack initiation and propagation are addressed.