Study of the concept of representative strain and constraint factor introduced by Vickers indentation - Archive ouverte HAL Access content directly
Journal Articles Mechanics of Materials Year : 2014

Study of the concept of representative strain and constraint factor introduced by Vickers indentation

(1) , (1) , (1)
1

Abstract

The application of the concept of the representative strain is often used in the stress-strain curve determination from indentation test because it can significantly simplify the analysis of the indentation response. A new methodology for determining the representative strain for Vickers indentation is presented in this article. Following a procedure based on finite element simulations of indentation of elastoplastic materials, two representative strains are defined: the representative strain characteristic of the mean pressure and the representative strain characteristic of the Martens hardness or the indentation loading curvature. The results obtained from this methodology show that there is no universal value of representative strain independent of the mechanical parameters of materials indented by Vickers indentation. It is also shown that the representative strain, obtained by Vickers indentation is much lower when it is obtained from the relationship between the applied force and the penetration depth, F-h, rather than from the relationship between the applied force and the contact radius, F-a. The values of the calculated representative strains show that simultaneous measurement of relationships F-a and F-h make it possible to characterize the hardening law with two unknown parameters by Vickers indentation.
Fichier principal
Vignette du fichier
article_Mech_mat_representative_strain_Vickers_indentation-version_auteur.pdf (10.08 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00864927 , version 1 (24-09-2013)

Identifiers

Cite

Xavier Hernot, Charbel Moussa, Olivier Bartier. Study of the concept of representative strain and constraint factor introduced by Vickers indentation. Mechanics of Materials, 2014, 68, pp.1-14. ⟨10.1016/j.mechmat.2013.07.004⟩. ⟨hal-00864927⟩
109 View
816 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More