Estimation of the Constitutive Law by Dual Small Punch Test and Instrumented Indentation

Gildas Guillemot; Adrien van Gorp; Thierry Coorevits; Alain Iost

doi:10.4028/www.scientific.net/SSP.188.193

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HomeSolid State PhenomenaSolid State Phenomena Vol. 188Estimation of the Constitutive Law by Dual Small...

Estimation of the Constitutive Law by Dual Small Punch Test and Instrumented Indentation

Abstract:

In this paper an inverse finite element procedure was developed to assess the true- stress strain relationship of a DP dual phase. Experiments were performed both by means of instrumented indentation and small punch tests on small samples cut in the same steel sheet. Tests are developed on a Zwick macro-hardness tester. Single test are first proposed in order to estimate the parameters of the constitutive law (K,n). We propose to conduct SPT tests using PTFE lubricant and hard (WC / Co) ball. An inverse method based on the Nelder and Mead algorithm has been developed in order to found experimental curves. Nevertheless we show that this method lead to poor estimation of the parameter of the constitutive law. We propose to improve these estimations by cross-mechanical tests. Indeed we show that the estimation of the low-error (K,n) domains deduced from each single test can be crossed. This method leads to a better estimation of the constitutive law. Moreover both load/displacement curves of SPT and macrohardness can be found again.

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Periodical:

Solid State Phenomena (Volume 188)

Pages:

193-198

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.188.193

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Online since:

May 2012

Authors:

Gildas Guillemot, Adrien van Gorp, Thierry Coorevits, Alain Iost

Keywords:

Constitutive Law, Instrumented Indentation, Inverse Method, Small Punch Test

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