Abstract
The data of Dunn and Martin (1978) is reanalyzed using a rigorous application of Hertzian theory to the impact process. The Young’s modulus of steel required to fit their data to the theory is a factor of about 103, too low compared to the values quoted for steels. Thus, doubt is thrown on the validity of their experimental technique, and it is possible that their values for maximum impact force and stress are far too low.
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References
Carmichael, R.S., editor, 1982, Handbook of Physical Properties of Rocks, Vol. II, CRC Press Inc., Florida, p. 306.
Dunn, D.J., and Martin, R.G., 1978, “Measurement of impact forces in ball mills,” Mining Engineering, pp. 384–388.
Goldsmith, W., 1960, Impact: The Theory and Physical Behaviour of Colliding Solids, Edward Arnold (London), pp. 87–90.
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Austin, L.G. Measurement of impact forces in ball mills: a reanalysis. Mining, Metallurgy & Exploration 18, 228–230 (2001). https://doi.org/10.1007/BF03403255
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DOI: https://doi.org/10.1007/BF03403255