"A finite element approach has been developed to simulate bit penetration from bit-rock interaction to chip formation. A mathematical rock failure model, based on a review of the existing literature on rock tests, has been proposed to represent post-failure rock behavior and applied in the penetration simulations. The finite element program has been developed for two dimensional plane strain problems with non-linear material properties, geometrical nonlinearities and fracture. An anisotropic element as well as variable stiffness and stress release methods have been used. An iteration method, using an incremental approach, has been applied for continuous penetration and modifications of material properties and displacements. Quantitative information on stress, displacement and material failure in the entire penetration process can be obtained through computer simulation. Blunt point, wedge and cylindrical bits are used in the penetration simulations. Blunt point bit penetration, with two different post-failure rock strengths, has been simulated and compared with experimental results"--Abstract, page ii.
Lehnhoff, T. F., 1939-
Clark, George Bromley, 1912-
Barker, Clark R.
Penico, Anthony J., 1923-2011
Davis, Robert L.
Mechanical and Aerospace Engineering
Ph. D. in Mechanical Engineering
University of Missouri--Rolla
ix, 102 pages
© 1975 Jaw-Kuang Wang, All rights reserved.
Dissertation - Restricted Access
Library of Congress Subject Headings
Bits (Drilling and boring)
Rocks -- Analysis -- Mathematical models
Rocks -- Testing
Print OCLC #
Electronic OCLC #
Link to Catalog RecordElectronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu:80/record=b1067231~S5
Wang, Jaw-Kuang, "Bit penetration into rock - a finite element study" (1975). Doctoral Dissertations. 12.