Indentation modulus at macro-scale level measured from Brinell and Vickers indenters by using the primary hardness standard machine at INRiM

Authors

  • Alessandro Schiavi INRIM - National Institute of Metrological Research http://orcid.org/0000-0003-4168-3605
  • Claudio Origlia INRIM - National Institute of Metrological Research
  • Alessandro Germak INRIM - National Institute of Metrological Research
  • Giulio Barbato Politecnico di Torino
  • Giovanni Maizza Politecnico di Torino
  • Gianfranco Genta Politecnico di Torino
  • Roberto Cagliero
  • Gianluca Coppola

DOI:

https://doi.org/10.21014/acta_imeko.v8i1.650

Abstract

In this paper, the experimental procedure and calculation model for the measurement of the indentation modulus by using the primary hardness standard machine at INRiM in the macro-scale range at room temperature is described. The indentation modulus is calculated based on the Doerner-Nix linear model and from accurate measurements of indentation load, displacement, contact stiffness, and hardness indentation imaging. Measurements are performed with both pyramidal (Vickers test) and spherical indenters (Brinell test). Test force is provided by a dead-weight machine, and the occurring displacement is measured by a laser-interferometric system. The geometrical dimensions of both the Vickers and Brinell indentations are measured by means of a micro-mechanical system and optical microscopy imaging techniques. Applied force and indentation depth are measured simultaneously, at a 16 Hz sampling rate, and the resultant loading-unloading indentation curve is obtained. Preliminary tests are performed on metal and alloy samples. Considerations and comments on the accuracy of the proposed method and analysis are discussed.

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Published

2019-03-31

Issue

Vol. 8 No. 1 (2019)

Section

Research Papers

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