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Strain-rate sensitivity (SRS) of nickel by instrumented indentation

Haynes, J. and Maier, V. and Durst, Karsten and Göken, M. (2013):
Strain-rate sensitivity (SRS) of nickel by instrumented indentation.
In: MEMS and Nanotechnology, New York, pp. 47-52, DOI: 10.1007/978-1-4614-4436-7_8,
[Online-Edition: https://link.springer.com/chapter/10.1007/978-1-4614-4436-7_...],
[Book Section]

Abstract

For materials which exhibit a power-law relationship between stress and strain rate, it is theoretically possible to evaluate the exponent (m) which governs the relationship by means of instrumented indentation. However, in practice, tests at small strain rates take so long that the results can easily be dominated by thermal drift. A new test method is developed in which several constant strain rates are examined within a single indentation test by switching strain rates as the indenter continues to move into the material. Switching strain rates within a single test overcomes the problem of long testing times by examining large strain rates first and transitioning to smaller strain rates as the test proceeds. The new method is used to test a sample of fine-grained nickel sold by NIST as a standard reference material for Vickers hardness. The strain-rate sensitivity of this sample is measured to be m = 0.021. This value is in good agreement with values obtained by others on fine-grained nickel using both instrumented indentation and uniaxial creep testing.

Item Type: Book Section
Erschienen: 2013
Creators: Haynes, J. and Maier, V. and Durst, Karsten and Göken, M.
Title: Strain-rate sensitivity (SRS) of nickel by instrumented indentation
Language: English
Abstract:

For materials which exhibit a power-law relationship between stress and strain rate, it is theoretically possible to evaluate the exponent (m) which governs the relationship by means of instrumented indentation. However, in practice, tests at small strain rates take so long that the results can easily be dominated by thermal drift. A new test method is developed in which several constant strain rates are examined within a single indentation test by switching strain rates as the indenter continues to move into the material. Switching strain rates within a single test overcomes the problem of long testing times by examining large strain rates first and transitioning to smaller strain rates as the test proceeds. The new method is used to test a sample of fine-grained nickel sold by NIST as a standard reference material for Vickers hardness. The strain-rate sensitivity of this sample is measured to be m = 0.021. This value is in good agreement with values obtained by others on fine-grained nickel using both instrumented indentation and uniaxial creep testing.

Title of Book: MEMS and Nanotechnology
Series Name: Conference Proceedings of the Society for Experimental Mechanics Series
Volume: 6
Place of Publication: New York
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 19 Jul 2018 12:02
DOI: 10.1007/978-1-4614-4436-7_8
Official URL: https://link.springer.com/chapter/10.1007/978-1-4614-4436-7_...
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