Experimental-numerical analysis of the indentation-based damage characterization methodology

C.C. Tasan, J.P.M. Hoefnagels, L.C.N. Louws, M.G.D. Geers

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

4 Citations (Scopus)
34 Downloads (Pure)

Abstract

The introduction of advanced high strength steels, e.g., into the automotive industry initiated a huge interest in analyzing and understanding ductile fracture of sheet metals to greater details. This demands for the development of experimental methodologies that provide microvoid evolution parameters, which also serve as crucial input parameters for advanced forming simulation that can predict damage evolution. Therefore, this work scrutinizes the reliability and applicability of an increasingly popular damage characterization methodology, in which microindentation tests are carried out to measure hardness and elastic modulus degradation as a function of accumulated strain, relating this degradation to damage evolution. To accomplish this goal, this methodology is applied to several different sheet metals of different formability (an interstitial-free steel, a dual phase steel, an aluminum-magnesium-silicon alloy and a ferritic stainless steel). To analyze and verify the results of indentation based methodology, damage evolution in these metals is monitored also via different experimental techniques, i.e. scanning electron microscopy, micro-ct tomography and sensitive density measurement. Moreover, finite element simulations are carried out to understand the effect of void accumulation in the degradation of hardness and elastic modulus. In the case of using the hardness as a damage probe, the degradation due to damage is always coupled to other effects (strain hardening, grain shape change, texture development) causing an increase in the obtained hardness value for all of the sheet metals tested, thereby complete obscuring any degradation of the hardness due to damage. In the case of elastic modulus, all the sheet metals tend to pile-up upon indentation when they are severely deformed, leading to large systematic errors in the Oliver-Pharr methodology based modulus determination, whereas the elastic modulus is also intrinsically altered by the grain shape change and texture development seen for increasing deformation. Therefore, it can only be concluded that, contrary to the published results in the literature, neither the hardness degradation nor the elastic modulus degradation can be used as a precise probe for damage accumulation, at least when the indentation based methodology is carried out in the originally-proposed manner that is commonly used in the literature.

Original languageEnglish
Title of host publicationAdvances in Experimental Mechanics VI
EditorsJ.M. Dulieu-Barton, J.D. Lord, R.J. Greene
PublisherTrans Tech Publications
Pages151-160
Number of pages10
DOIs
Publication statusPublished - 2008

Publication series

NameApplied Mechanics and Materials
PublisherTrans Tech Publications
Volume13-14
ISSN (Print)1660-9336

Fingerprint

Indentation
Numerical analysis
Hardness
Degradation
Sheet metal
Elastic moduli
Textures
Silicon alloys
Ductile fracture
Steel
Systematic errors
Ferritic steel
Formability
Magnesium alloys
High strength steel
Automotive industry
Strain hardening
Piles
Tomography
Stainless steel

Keywords

  • Ductile damage
  • Experimental-numerical characterization
  • Microvoids
  • Sheet metal forming

Cite this

Tasan, C. C., Hoefnagels, J. P. M., Louws, L. C. N., & Geers, M. G. D. (2008). Experimental-numerical analysis of the indentation-based damage characterization methodology. In J. M. Dulieu-Barton, J. D. Lord, & R. J. Greene (Eds.), Advances in Experimental Mechanics VI (pp. 151-160). (Applied Mechanics and Materials; Vol. 13-14). Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/AMM.13-14.151
Tasan, C.C. ; Hoefnagels, J.P.M. ; Louws, L.C.N. ; Geers, M.G.D. / Experimental-numerical analysis of the indentation-based damage characterization methodology. Advances in Experimental Mechanics VI. editor / J.M. Dulieu-Barton ; J.D. Lord ; R.J. Greene. Trans Tech Publications, 2008. pp. 151-160 (Applied Mechanics and Materials).
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Tasan, CC, Hoefnagels, JPM, Louws, LCN & Geers, MGD 2008, Experimental-numerical analysis of the indentation-based damage characterization methodology. in JM Dulieu-Barton, JD Lord & RJ Greene (eds), Advances in Experimental Mechanics VI. Applied Mechanics and Materials, vol. 13-14, Trans Tech Publications, pp. 151-160. https://doi.org/10.4028/www.scientific.net/AMM.13-14.151

Experimental-numerical analysis of the indentation-based damage characterization methodology. / Tasan, C.C.; Hoefnagels, J.P.M.; Louws, L.C.N.; Geers, M.G.D.

Advances in Experimental Mechanics VI. ed. / J.M. Dulieu-Barton; J.D. Lord; R.J. Greene. Trans Tech Publications, 2008. p. 151-160 (Applied Mechanics and Materials; Vol. 13-14).

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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AB - The introduction of advanced high strength steels, e.g., into the automotive industry initiated a huge interest in analyzing and understanding ductile fracture of sheet metals to greater details. This demands for the development of experimental methodologies that provide microvoid evolution parameters, which also serve as crucial input parameters for advanced forming simulation that can predict damage evolution. Therefore, this work scrutinizes the reliability and applicability of an increasingly popular damage characterization methodology, in which microindentation tests are carried out to measure hardness and elastic modulus degradation as a function of accumulated strain, relating this degradation to damage evolution. To accomplish this goal, this methodology is applied to several different sheet metals of different formability (an interstitial-free steel, a dual phase steel, an aluminum-magnesium-silicon alloy and a ferritic stainless steel). To analyze and verify the results of indentation based methodology, damage evolution in these metals is monitored also via different experimental techniques, i.e. scanning electron microscopy, micro-ct tomography and sensitive density measurement. Moreover, finite element simulations are carried out to understand the effect of void accumulation in the degradation of hardness and elastic modulus. In the case of using the hardness as a damage probe, the degradation due to damage is always coupled to other effects (strain hardening, grain shape change, texture development) causing an increase in the obtained hardness value for all of the sheet metals tested, thereby complete obscuring any degradation of the hardness due to damage. In the case of elastic modulus, all the sheet metals tend to pile-up upon indentation when they are severely deformed, leading to large systematic errors in the Oliver-Pharr methodology based modulus determination, whereas the elastic modulus is also intrinsically altered by the grain shape change and texture development seen for increasing deformation. Therefore, it can only be concluded that, contrary to the published results in the literature, neither the hardness degradation nor the elastic modulus degradation can be used as a precise probe for damage accumulation, at least when the indentation based methodology is carried out in the originally-proposed manner that is commonly used in the literature.

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Tasan CC, Hoefnagels JPM, Louws LCN, Geers MGD. Experimental-numerical analysis of the indentation-based damage characterization methodology. In Dulieu-Barton JM, Lord JD, Greene RJ, editors, Advances in Experimental Mechanics VI. Trans Tech Publications. 2008. p. 151-160. (Applied Mechanics and Materials). https://doi.org/10.4028/www.scientific.net/AMM.13-14.151