Theoretical Study on Flat Tooth Cone Fracture Type Rock Breaking based on Plane Indentation
AUTHORS
Yili Duo,School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China; College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
Yujun Xie,College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
Jun Hai,School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China
ABSTRACT
During rock breaking by drill, cone rolls on the rock surface, and contact between gear teeth and surface is basically positive Mode-I plane indentation and bias Mode-I plane indentation. During bias action, there will be an asymmetrical Mode-I singular stress field at both ends of the indenter. The stress field singularity is of the same order as Mode-I crack tip, and with the same function distribution. In this paper, based on J2 integral conservation law, a new method is established for solving stress intensity factor of bias Mode-I plane indentation, which not only provides respective stress intensity factor of both ends of indenter, but also compares relations between eccentricity, partial load and stress intensity factor. The study not only provides a method for establishment of new cone drill engineering design, but also improves rock layer boring efficiency.
KEYWORDS
Plane Indentation, Stress Intensity Factor, Rock Breaking Mechanism, Crack.
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© 2018 Xie Yujun et al. Published by Global Vision Press. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CCBY4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.