Volume 39 Issue 3
Mar.  2013
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Wang Minghai, Wang Wei, Gao Leiet al. Process of ducile-brittle transition of crystal brittle materials on ultra-precision machining[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(3): 366-370. (in Chinese)
Citation: Wang Minghai, Wang Wei, Gao Leiet al. Process of ducile-brittle transition of crystal brittle materials on ultra-precision machining[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(3): 366-370. (in Chinese)

Process of ducile-brittle transition of crystal brittle materials on ultra-precision machining

  • Received Date: 16 Mar 2012
  • Publish Date: 31 Mar 2013
  • By combination of fracture mechanics and dislocation mechanics, the method of simulating the process of ducile-brittle transition of brittle material based on the connection between macromechanics and micromechanics was discussed. The single crystal material mechanical property and crystal geometric structure was given. In press-shear complicated stress condition, interaction mechanism between its internal cracks and dislocation was demonstrated, its process of ducile-brittle transition on ultra-precision machining was illustrated. Considering cutting tool to crystal material press-shear mixed effect, the method of realizing the best tool's rake angle was given and the influence of the tool edge radius on the process of ducile-brittle transition of crystal brittle materials on the ultra precision machining was analyzed. Finally, research results were tested and verified through the experiments.

     

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