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The instrumented indentation test provides a versatile method to determine several materials parameter. In order to provide reference specimens, a calibration machine according to ISO 14577-3 is designed for the macro range. Using innovative technology, the new machine design may lead to a standard solution not only for calibration machines.
A new calibration machine according to the
requirements given by ISO 14577-3 [1] was described in [2].
The results of the verification are reported in this paper. It is
shown that the calibration machine can be used as a national
standard for the materials parameter of the instrumented
indentation test.
Effect and measurement of the machine compliance in the macro range of instrumented indentation test
(2010)
The contribution concerns the strong effect of the machine compliance in the upper macro range of the instrumented indentation test on hard materials. To achieve a minimum uncertainty in determination of the machine compliance the measurement and analysis needed for the determination are studied in detail. Based on the assumption that the hardness and/or the indentation modulus are force independent, four methods on the determination of the machine compliance are described. Experimental results of a commercial testing machine up to 2500 N and of a standard machine up to 200 N are analyzed. The results show that the uncertainty of the compliance is usually higher than requested for a precisely enough determination of hardness and further materials parameters. Especially for the calibration of reference materials with high hardness and/or Youngs modulus, the machine compliance should be limited in ISO 14577 part 3, 2003 [1].