Determination of an effective zero-point and extraction of indentation stress–strain curves without the continuous stiffness measurement signal

Pathak, Siddhartha; Shaffer, Joshua; Kalidindi, Surya R.

doi:10.1016/j.scriptamat.2008.11.028

Cited by 76 publications

(62 citation statements)

References 11 publications

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“…As it was described earlier, the elastic-plastic transition or indentation yield strength determined using spherical indentation stress-strain protocols is a more physically relevant measurement to establish correlations with uniaxial strength. This is the first mesoscale study using protocols based on the spherical nanoindentation protocols of Kalidindi and Pathak [4,29].…”

Section: Methodsmentioning

confidence: 99%

“…The general method followed for converting indentation load-displacement data into indentation stress-strain curves can be found in references [4,29]. It is emphasized that this is the first use of these protocols to study polycrystalline material volumes in the primary indentation zone.…”

Section: Microindentation Data Analysesmentioning

confidence: 99%

“…For microindentation testing equipment used in this work, there is no CSM as noted earlier, this is only available in most modern nanoindenters [30]. As demonstrated in prior work [4,29], the measurement of unloading (elastic) stiffness is central to a reliable estimation of contact radius needed in the computation of indentation stress and indentation strain measures. Consequently, in the present work, we rely on superimposing intermittent unloading-loading cycles on the desired loading history.…”

Section: Microindentation Data Analysesmentioning

confidence: 99%

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High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

Weaver

Khosravani

Castillo

et al. 2016

Integr Mater Manuf Innov

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Recent spherical nanoindentation protocols have proven robust at capturing the local elastic-plastic response of polycrystalline metal samples at length scales much smaller than the grain size. In this work, we extend these protocols to length scales that include multiple grains to recover microindentation stress-strain curves. These new protocols are first established in this paper and then demonstrated for Al-6061 by comparing the measured indentation stress-strain curves with the corresponding measurements from uniaxial tension tests. More specifically, the scaling factors between the uniaxial yield strength and the indentation yield strength was determined to be about 1.9, which is significantly lower than the value of 2.8 used commonly in literature. The reasons for this difference are discussed. Second, the benefits of these new protocols in facilitating high throughput exploration of process-property relationships are demonstrated through a simple case study.

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Section: Methodsmentioning

confidence: 99%

Section: Microindentation Data Analysesmentioning

confidence: 99%

Section: Microindentation Data Analysesmentioning

confidence: 99%

See 1 more Smart Citation

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

Weaver

Khosravani

Castillo

et al. 2016

Integr Mater Manuf Innov

View full text Add to dashboard Cite

show abstract

“…However, a drawback of the indentation test, if the objective is to identify bulk material properties, is its sensitivity to low scale artefacts such as sensor sensitivity, surface roughness, imperfect indenter geometry, and material heterogeneity [13][14][15][16][17][18][19]. These artefacts, independently from the assumptions on the bulk material behaviour, lead to deviations from the ideal F-h curve predicted by the identification models based on Eq.2.…”

Section: Introductionmentioning

confidence: 99%

An alternative to the determination of the effective zero point in instrumented indentation: Use of the slope of the indentation curve at indentation load values

Brammer¹,

Bartier²,

Hernot³

et al. 2012

Materials & Design

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Most identification models based on instrumented indentation rely on the knowledge of the indentation load-penetration depth curve corresponding to the bulk material. Experimentally, and especially in the case of micro and nanoindentation testing, the measured curve can be affected by low scale artefacts such as sensor sensitivity, surface roughness, imperfect indenter tip geometry and material heterogeneity, leading to incorrect identifications of the indented material's bulk mechanical properties. This work proposes an exploitation of identification models which is based on the slope of the indentation curve at indentation load values and provides accurate results which are not affected by low scale artefacts.

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“…54,55 These protocols involve rigorous procedures for identifying the initial elastic loading segment in the measured load-displacement curve (as opposed to the unloading segments used in most currently employed protocols). This is accomplished by fitting the load, displacement, and the continuous stiffness measurements from the indentation test to the expected interrelationships between them based on Hertz's theory.…”

Section: Interfaces and Interphases In Compositesmentioning

confidence: 99%

Mechanical Characterization of Mesoscale Interfaces Using Indentation Techniques

Kalidindi

Mohan

Rossi

2016

JOM

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Mesoscale interfaces and interphases play a central role in controlling the many macroscale mechanical properties and performance characteristics of structural materials. Modern instrumented indenters present an unprecedented opportunity to measure, reliably and consistently, the local mechanical responses at a multitude of length scales ranging from tens of nanometers to hundreds of microns. When these high-fidelity measurements are combined with rigorous data analyses protocols, it is possible to systematically study the mechanical role of individual mesoscale interfaces and quantify their contributions to the overall mechanical response of the material system. The advantages of these new measurement and analyses protocols as well as the potential for development and implementation of novel high-throughput assays is discussed.

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Determination of an effective zero-point and extraction of indentation stress–strain curves without the continuous stiffness measurement signal

Cited by 76 publications

References 11 publications

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

An alternative to the determination of the effective zero point in instrumented indentation: Use of the slope of the indentation curve at indentation load values

Mechanical Characterization of Mesoscale Interfaces Using Indentation Techniques

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