Determination of the effective zero-point and the extraction of spherical nanoindentation stress–strain curves

Kalidindi, Surya R.; Pathak, Siddhartha

doi:10.1016/j.actamat.2008.03.036

Cited by 224 publications

(197 citation statements)

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“…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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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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“…Recent experiments have revealed that the results of nanoindentation strongly depend on indenter geometry [28][29][30]. Here, we examine the atomistic response to nanoindentation by a sharp indenter with various centerlineto-face angles α.…”

mentioning

confidence: 99%

The model developed for stress-induced structural phase transformations of micro-crystalline silicon films

Han

Lin

2010

Nano-Micro Lett.

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The nanoindentations were applied to island-shaped regions with metal-induced Si crystallizations. The experimental stress-strain relationship is obtained from the load-depth profile in order to investigate the critical stresses arising at various phase transitions. The stress and strain values at various indentation depths are applied to determine the Gibbs free energy at various phases. The intersections of the Gibbs free energy lines are used to determine the possible paths of phase transitions arising at various indentation depths. All the critical contact stresses corresponding to the various phase transitions at four annealing temperatures were found to be consistent with the experimental results. undergoes a direct transition from diamond to a simple hexagonal structure. One such prediction was a kinetically hindered first order amorphous to amorphous phase transition in SiO 2 [21]. An experiment has recently confirmed such a first order amorphous to amorphous phase transition [22]. Such calculations require candidate structures which may be obtained from constant pressure simulations and sometimes experiments [23,24]. In the present study, a theoretical model is developed

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“…It should be noted that, when using Eq. (4.14) to estimate the contact radius, the Young's modulus is assumed as constant during the indentation process [71,153]. In the experimental analysis, the value of stress constraint fact is taken as 3.2, and the strain constraint factor is confirmed from Eq.…”

Section: Analysis Of the Experimental Resultsmentioning

confidence: 99%

“…Recently, Klidindini et al [70,71] Dimensional analysis is widely used to explore the terms of indentation with the help of finite element analysis [72]. This method needs a large number of FEM computations within a certain range of the material properties defined as the power law equation.…”

Section: Determination Of Plastic Property Through Spherical Indentatmentioning

confidence: 99%

“…The indentation stress vs. strain curve can be obtained using the model proposed by S.R. Kalidindi et al [71]. As the value of the Young's modulus of the materials studied was measured using the Oliver-Pharr method on the Berkovich indentation data, the contact radius (a) could be estimated according to Sneddon's equation [17]: Hollomon's equation [176].…”

Section: Dsi Tests With Berkovich Indenter Tipmentioning

confidence: 99%

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Determining the elastic-plastic properties of metallic materials through instrumented indentation

Chang¹

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AgradecimientosPrimero, me gustaria agradecer a mis supervisores. Me gustaría expresar mi máximo aprecio hacia mi supervisor Dr. J. Ruiz-Hervias por guiarme y ayudarme durante estos años en el laboratorio. He aprendido de él, no solo en lo estrictamente académico, si no en su generosidad y en su mente positiva hacia la vida. Además, también quería agradecer a mi co-supervisor Dr. M. A. Garrido. Él ha jugado un papel muy significante en el inicio de mi vida académica. Sus ideas y su entusiasmo siempre me inspiraron y me motivaron. Sin su paciencia y su ayuda, nunca hubiera acabado esta tesis. ResumenEn los últimos años, y asociado al desarrollo de la tecnología MEMS, la técnica de indentación instrumentada se ha convertido en un método de ensayo no destructivo ampliamente utilizado para hallar las características elástico-plásticas de recubrimientos y capas delgadas, desde la escala macroscópica a la microscópica. Sin embargo, debido al complejo mecanismo de contacto debajo de la indentación, es urgente proponer un método más simple y conveniente para obtener unos resultados comparables con otras mediciones tradicionales. En este estudio, el objetivo es mejorar el procedimiento analítico para extraer las propiedades elástico-plásticas del material mediante la técnica de indentación instrumentada.La primera parte se centra en la metodología llevada a cabo para medir las propiedades elásticas de los materiales elásticos, presentándose una nueva metodología de indentación, basada en la evolución de la rigidez de contacto y en la curva fuerza-desplazamiento del ensayo de indentación. El método propuesto permite discriminar los valores de indentación experimental que pudieran estar afectados por el redondeo de la punta del indentador. Además, esta técnica parece ser robusta y permite obtener valores fiables del modulo elástico.La segunda parte se centra en el proceso analítico para determinar la curva tensión-deformación a partir del ensayo de indentación, empleando un indentador esférico. Para poder asemejar la curva tension-deformación de indentación con la que se obtendría de un ensayo de tracción, Tabor determinó empíricamente un factor de constricción de la tensión () y un factor de constricción de la deformación (). Sin embargo, la elección del valor de  y  necesitan una derivación analítica. Se describió analíticamente una nueva visión de la relación entre los factores de constricción de tensión y la deformación basado en la deducción de la viii ecuación de Tabor. Un modelo de elementos finitos y un diseño experimental se realizan para evaluar estos factores de constricción. A partir de los resultados obtenidos, las curvas tension-deformación extraidas de los ensayos de indentación esférica, afectadas por los correspondientes factores de constricción de tension y deformación, se ajustaron a la curva nominal tensión-deformación obtenida de ensayos de tracción convencionales.En la última parte, se estudian las propiedades del revestimiento de cermet Inconel 625-Cr 3 C 2 que es depositado en el medio de una a...

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Determination of the effective zero-point and the extraction of spherical nanoindentation stress–strain curves

Cited by 224 publications

References 52 publications

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

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

The model developed for stress-induced structural phase transformations of micro-crystalline silicon films

Determining the elastic-plastic properties of metallic materials through instrumented indentation

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