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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 1    March 1996

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DISLOCATION EMISSION AND EQUATION OFENERGY BARRIERS AT MODEL I CRACK TIP
Zou Hongcheng,dai Shujuan,Liu Furong,Hu Xiangyang,Li Changchun

National Laboratory of Plastic Forming Sim.ulatinn and Die &. Mould Technology Huazhong University of Science and Technology,Wuhan 430074

Abstract:The propagation for the model I crack in aluminum single crystal has been directly stud-ied by is-situ TEM observation. The equation of energy harrier of the dislocation building-up and emis-sion at the model I crack tip has been established by means of  Peierls-Nabarro dislocation model and starting from angle of energy. By means of calculation, the critical value of spontaneous emission of the  dislocations from tip of the model I crack was obtained.

 

Key words: emission of dislocation  propagation of crack   Peierls-Nabarro dislocation model   energy barriers  model I crack

ISSN 1672-7029
CN 43-1423/U

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