A new analytical model for thermal drilling (also known as friction drilling) has been developed. The model distinguishes itself from recent work of other investigators by improving on two aspects: (1) the new model defines material plastic flow in terms of the yield in shear rather than the yield in compression, and (2) it uses a single, variable friction coefficient instead of assuming two unrelated friction coefficients in fixed values. The time dependence of the shear stress and friction coefficient at the hole walls, which cannot be measured directly in thermal drilling, can be calculated using this model from experimentally measured values of the instantaneous thrust force and torque. Good matches between the calculated shear strengths and the handbook values for thermally drilling low carbon steel confirm the model’s validity.
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February 2008
Technical Briefs
A New Model to Calculate Friction Coefficients and Shear Stresses in Thermal Drilling
Jun Qu,
Jun Qu
Materials Science and Technology Division,
e-mail: qujn@ornl.gov
Oak Ridge National Laboratory
, P.O. Box 2008, MS 6063, Oak Ridge, TN 37831-6063
Search for other works by this author on:
Peter J. Blau
Peter J. Blau
Materials Science and Technology Division,
Oak Ridge National Laboratory
, P.O. Box 2008, MS 6063, Oak Ridge, TN 37831-6063
Search for other works by this author on:
Jun Qu
Materials Science and Technology Division,
Oak Ridge National Laboratory
, P.O. Box 2008, MS 6063, Oak Ridge, TN 37831-6063e-mail: qujn@ornl.gov
Peter J. Blau
Materials Science and Technology Division,
Oak Ridge National Laboratory
, P.O. Box 2008, MS 6063, Oak Ridge, TN 37831-6063J. Manuf. Sci. Eng. Feb 2008, 130(1): 014502 (4 pages)
Published Online: February 6, 2008
Article history
Received:
December 1, 2006
Revised:
September 24, 2007
Published:
February 6, 2008
Citation
Qu, J., and Blau, P. J. (February 6, 2008). "A New Model to Calculate Friction Coefficients and Shear Stresses in Thermal Drilling." ASME. J. Manuf. Sci. Eng. February 2008; 130(1): 014502. https://doi.org/10.1115/1.2815341
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