Paper Title:
Study on the Mechanism of the Impactor-Bit-Rock Interaction Using 3D FEM Analysis
  Abstract

To reveal the mechanism of the impactor-bit-rock interaction in geophysical prospecting percussion drilling, considering the coupling effect of the static pressure, impact force and rotary cutting, constructing the physical model of the impactor-bit-rock interaction, and using the finite element methods (FEM), three-dimensional (3D) model of the impactor-bit-rock interaction is established. Using the finite element analysis software (ANSYS/LS-DYNA), the 3D FEM analysis of the impactor-bit-rock interaction is carried out when compressed air pressure is 0.8 MPa, 0.9 MPa, 1.0 MPa, 1.1 MPa and 1.2 MPa respectively. The results show that: the energy transmission efficiency when piston impacts bit under different air pressure is not high and it should be improved further, bit can not fragment rock until it is impacted by piston, it is found that the best air pressure is 1.0 MPa when the impactor and bit are used to drill granite according to the volume of the fragmented rock and the depth of the crater, the speed and displacement on the radial direction of the piston which should be reduce even eliminate are very harmful. The results are further useful to extend the applications of the geophysical prospecting impactor and hammer bit.

  Info
Periodical
Advanced Materials Research (Volumes 189-193)
Edited by
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
Pages
2280-2284
DOI
10.4028/www.scientific.net/AMR.189-193.2280
Citation
Y. T. Fan, Z. Q. Huang, D. L. Gao, Q. Li, H. Y. Zhu, "Study on the Mechanism of the Impactor-Bit-Rock Interaction Using 3D FEM Analysis", Advanced Materials Research, Vols. 189-193, pp. 2280-2284, 2011
Online since
February 2011
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Price
$32.00
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