Strain-Rate Sensitivity (SRS) of Nickel by Instrumented Indentation

  • Jennifer HayEmail author
  • Verena Maier
  • Karsten Durst
  • Mathias Göken
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


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.


Applied Force Indentation Size Effect Test Strain Rate Thermal Drift Instrument Indentation 
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Copyright information

© The Society for Experimental Mechanics 2013

Authors and Affiliations

  • Jennifer Hay
    • 1
    Email author
  • Verena Maier
    • 2
  • Karsten Durst
    • 2
  • Mathias Göken
    • 2
  1. 1.Agilent Technologies, Inc., Nano-Measurements OperationOak RidgeUSA
  2. 2.Department of Materials Science and Engineering Institute 1: General Materials PropertiesUniversity Erlangen-NurembergErlangenGermany

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