DEFINITION OF NEW INDUSTRIAL HARDNESS TEST USING EQUIVALENT INDENTATION DEPTH
Takashi Yamamoto, Kensuke Miyahara
Abstract:
The Rockwell hardness test is commonly used and accepted by many industrial users, but the hardness value requires conversion between scales because the geometry of the indenters and the load ranges are different. On the other hand, hardness calculation using pyramidal indenters is quite simple and can be applied to any load range, though it is much more complicated to calibrate the frame compliance and the truncation of indenters in nanoindentation measurement. For this reason, nanoindentation measurement is not yet fully industrially friendly. In order to improve the above situation, newly developed industrial hardness test methods and a new concept of “Equivalent indentation depth (or indentation depth index)” were proposed and investigated in this paper. These methods are based on the principle of “similarity” of Vickers and other pyramidal indenters, and take advantage of the industrial and practical usability of the Rockwell hardness test. Experimental results that covered macroscopic through nanoscopic ranges show that the methods can be applied to a wide range of test loads. One of the expected advantages of the methods of performing nanoindentation and other instrumented indentation tests (ISO 14577) is that the hardness is not significantly influenced by the frame compliance or the truncation of indenters. Other advantages over conventional hardness tests are also discussed in this paper. More experimental work is necessary to confirm and establish the new methods.
Keywords:
new hardness test, similarity, indentation depth index, nanoindentation, Rockwell hardness
Download:
IMEKO-TC5-2007-015.pdf
DOI:
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Event details
IMEKO TC:
TC5
Event name:
Symposium on Recent Advancements in the Theory and Practice of Hardness Measurement
Title:
10th HARDMEKO Conference: HARDMEKO 2007
Place:
Tsukuba, JAPAN
Time:
19 November 2007 - 21 November 2007
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