An experimental technique for determining the dynamic indentation hardness of materials is described. Unlike the traditional static hardness measurements, the dynamic hardness measurements can capture the inherent rate dependent material response that is germane to high strain rate processes such as high speed machining and impact. The dynamic Vickers hardness (DHV) of several commonly used engineering materials is found to be greater than the static Vickers hardness (HV). The relationship between the hardness and yield stress under static conditions, i.e., HV =3σy, is also found to be valid under dynamic conditions. It is suggested that this simpler technique can be used to assess the rate sensitive nature of engineering materials at moderate strain rates in the range of around 2000/s.
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July 1999
Technical Papers
Dynamic Indentation Hardness and Rate Sensitivity in Metals
G. Subhash,
G. Subhash
Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, MI 49931-1295
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B. J. Koeppel,
B. J. Koeppel
Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, MI 49931-1295
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A. Chandra
A. Chandra
Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, MI 49931-1295
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G. Subhash
Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, MI 49931-1295
B. J. Koeppel
Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, MI 49931-1295
A. Chandra
Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, MI 49931-1295
J. Eng. Mater. Technol. Jul 1999, 121(3): 257-263 (7 pages)
Published Online: July 1, 1999
Article history
Received:
April 6, 1998
Revised:
August 7, 1998
Online:
November 27, 2007
Citation
Subhash, G., Koeppel, B. J., and Chandra, A. (July 1, 1999). "Dynamic Indentation Hardness and Rate Sensitivity in Metals." ASME. J. Eng. Mater. Technol. July 1999; 121(3): 257–263. https://doi.org/10.1115/1.2812373
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