Analyse par simulation numérique de l'influence du facteur de correction sur les mesures de dureté de matériaux élasto-plastiques en indentation instrumentée

Translated title of the contribution: Numerical analysis of the depth-dependent correction factor influence on hardness measurements in indentation testing of elastic-plastic materials

F. Abbès, M. Troyon, J. M. Meza, S. Potiron, J. A. Garcia Guzman

    Research output: Contribution to journalArticle in an indexed scientific journalpeer-review

    Abstract

    Measurements of mechanical properties by instrumented indentation rely heavily upon the relationship between the unloading contact stiffness, S u, the projected contact area, Ac, and the reduced modulus, Er. This relationship is written in the form Su = 2βEr(Ac/π)1/2, where β is a correction factor that depends on the material properties, the geometry of the indenter and also the penetration depth. In practice, the correction factor is generally assumed constant for a given tip geometry. However, numerical simulations of indentation test performed on purely elastic materials have evidenced that β strongly depends on the penetration depth/tip radius ratio. In this work, the dependence of β on the penetration depth and tip blunting is studied by FEA in the case of elastic-plastic materials generally encountered in engineering. The consequence of not taking into account the influence of β on hardness measurements is also investigated.

    Translated title of the contributionNumerical analysis of the depth-dependent correction factor influence on hardness measurements in indentation testing of elastic-plastic materials
    Original languageFrench
    Pages (from-to)179-184
    Number of pages6
    JournalMateriaux et Techniques
    Volume99
    Issue number2
    DOIs
    StatePublished - 2011

    Keywords

    • Correction factor
    • Elastic-plastic materials
    • Hardness
    • Instrumented indentation

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