Evaluation of New Technique to Estimate Yield Stress in Brittle Materials Via Spherical Indentation Testing

Hackett, B.; Wereszczak, Andrew A.; Pharr, George M.

doi:10.1002/9781119543343.ch6

Cited by 5 publications

(12 citation statements)

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“…Studies employing spherical nanoindentation implement various strategies for calculating the effective radius, R eff [7,28,31,40]. The value of R eff can be calculated by using Equation 6 and the nominal tip radius provided by the manufacturer [16]. More commonly, R eff is calculated by fitting Equation 4 to data collected in fused silica [39,40,51].…”

Section: Determination Of Effective Radiusmentioning

confidence: 99%

“…The most common benchmark in nanoindentation is observation of a constant Young's modulus with depth [e.g., 28,49]. Following the derivation from Hackett et al [16] and using Equations 4 and 9, we can express the effective Young's modulus as…”

Section: Benchmarksmentioning

confidence: 99%

“…The potential to produce a large number of measurements and generate indentation stress-strain curves from a small volume of material makes spherical nanoindentation a desirable technique with a wide range of applications. For example, spherical nanoindentation has been deployed to investigate yield stress and size effects in brittle engineering ceramics and natural minerals [e.g., 12,16,17,27,48,58], the mechanical properties of twin and grain boundaries in metals [e.g., 29,52,56], the effects of ion-induced damage in metals and alloys [e.g., 1,8,42], the relationship between structure and mechanical properties in biomaterials (bone [e.g., 41], human enamel [e.g., 18]), elasto-plastic transitions in bulk metallic glasses [e.g, 3,10], and fracture in thin films [e.g., 33,57]. This versatility of mechanical testing using spherical indentation has motivated studies on the reliability of measurements and prompted efforts to improve data analysis.…”

Section: Introductionmentioning

confidence: 99%

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Calibration and data analysis routines for nanoindentation with spherical tips

Avadanii¹,

Kareer²,

Hansen³

et al. 2023

Preprint

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Instrumented spherical nanoindentation with a continuous stiffness measurement has gained increased popularity in material science studies in brittle and ductile materials alike. These investigations span hypotheses related to a wide range of microphysics involving grain boundaries, twins, dislocation densities, ion-induced damage and more. These studies rely on the implementation of different methodologies for instrument calibration and for circumventing tip shape imperfections. In this study, we test, integrate, and re-adapt published strategies for tip and machinestiffness calibration for spherical tips. We propose a routine for independently calibrating the effective tip radius and the machine stiffness using three reference materials (fused silica, sapphire, glassy carbon), which requires the parametrization of the effective radius as a function of load. We validate our proposed workflow against key benchmarks, such as variation of Young's modulus with depth. We apply the resulting calibrations to data collected in materials with varying ductility (olivine, titanium, and tungsten) to extract indentation stress-strain curves. We also test the impact of the machine stiffness on recently proposed methods for identification of yield stress, and compare the influence of different conventions on assessing the indentation size effect. Finally, we synthesize these analysis routines in a single workflow for use in future studies aiming to extract and process data from spherical nanoindentation.

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Section: Determination Of Effective Radiusmentioning

confidence: 99%

Section: Benchmarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calibration and data analysis routines for nanoindentation with spherical tips

Avadanii¹,

Kareer²,

Hansen³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The measured loading response is interpreted and the applied force where the onset of yield occurs is identified [11][12]. Using that identified force, the apparent yield stress of the material is calculated using classical Hertz theory.…”

Section: X-ray Radiography Of Paris-edinburgh (Pe) Cell Compression T...mentioning

confidence: 99%

“…Spherical indentation was additionally performed on BOROFLOAT ® and Starphire ® using a nanoindenter [12], and its results are included for the sake of comparison.…”

Section: X-ray Radiography Of Paris-edinburgh (Pe) Cell Compression T...mentioning

confidence: 99%