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International Journal of Forming Processes
1292-7775
Publication suspended
 

 ARTICLE VOL 4/3-4 - 2001  - pp.413-430  - doi:10.3166/ijfp.4.413-430
TITLE
On the Simulation of Microhardness at Large Strains Using a Gradient Theory of Plasticity

ABSTRACT

Indentations tests, e.g. the Brinell and Vickers tests, are frequently exploited to eval-uate the hardness of metals, which reflects the elastic as well as the plastic properties. It is a well-known fact that the hardness shows significant size-effect when the diameter of the inden-ter is of the order of one micron in the context of engineering metals. In this contribution we employ a recently developed gradient theory of macroscopic plasticity in order to evaluate such microhardness. The proposed gradient theory is thermodynamically consistent and is valid for large inelastic strains (as well as large elastic strains; however, the elastic strain remains small in the present application), cf. (Svedberg, 2000). Finite element simulations demonstrate the size-effect on the hardness for different head-shapes of the indenter.

AUTEUR(S)
Thomas SVEDBERG, Kenneth RUNESSON

Reçu le 10 septembre 2001.    Accepté le 22 octobre 2001.

KEYWORDS
Microhardness, gradient plasticity, large strains.

LANGUE DE L'ARTICLE
Anglais

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