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- Title
Dislocation Model for Crack Nucleating in Meta Subjected to Low-Velocity Shocking.
- Authors
Huang Zaixing
- Abstract
The microcrack nucleation due to the low-velocity shocking is investigated. A dislocation model for the microcrack nucleation is established. Based on the model, two velocity criterions are given to judge the brittle crack and the ductile crack nucleation respectively. In the two criterions, the shocking resistance is defined. The influences of the grain size and ductile-brittle transform temperature on the shocking resistance are determined. Results show that the resistance to the low-velocity shocking changes with the size of crystal graining in the direct proportion. The effects of temperature on the shocking resistances depend on the category of the microcrack nucleation. The shocking resistance of the brittle microcrack nucleation increases with temperature rising. On the contrary, the shocking resistance of the ductile microcrack nucleation decreases with temperature increasing. The ductile-brittle transform temperature is given in terms of the intersection between the shocking resistance-temperature curve of the brittle and ductile microcrack nucleation.
- Subjects
DISLOCATIONS in metals; DEFORMATIONS (Mechanics); NUCLEATION; BRITTLE fractures; CRYSTALS
- Publication
Journal of Nanjing University of Aeronautics & Astronautics / Nanjing Hangkong Hangtian Daxue Xuebao, 2012, Vol 44, Issue 5, p658
- ISSN
1005-2615
- Publication type
Article