Title: On the possibility to obtain the stress-strain curve for a strain-hardening material by spherical indentation

Authors: M. Beghini, L. Bertini, V. Fontanari

Addresses: Dip. Ingegneria Meccanica, Nucleare e della Produzione, Universita di Pisa, Italy. Dip. Ingegneria Meccanica, Nucleare e della Produzione, Universita di Pisa, Italy. Dip. Ingegneria dei Materiali, Universita di Trento, Italy

Abstract: A numerical approach aimed at evaluation the stress-strain curve for metallic materials starting from the results of instrumented spherical indentation tests is presented. The spherical indentation for materials having different σ-ε curves was modelled by means of a parametric finite-elements analysis. It was studied as the shape of the indentation crater evolves with the load and it was verified that it depends on the strain-hardening and yield stress of the material. By means of an elaboration of these results, an iterative procedure was set up, which allows the σ-ε curve to be obtained with satisfactory accuracy for a large class of materials. The procedure was tested by interpreting a simulated indentation test on a typical structural steel, thus confirming its validity and accuracy.

Keywords: spherical indentation; stress-strain curve; strain-hardening; numberical modelling.

DOI: 10.1504/IJCAT.2002.000292

International Journal of Computer Applications in Technology, 2002 Vol.15 No.4/5, pp.168-175

Published online: 13 Dec 2003 *

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