Influence of visco-elasto-plastic properties of magnetite on the elastic modulus: Multicyclic indentation and theoretical studies

Chicot, Didier; Roudet, Francine; Zaoui, A.; Louis, G.; Lépingle, V.

doi:10.1016/j.matchemphys.2009.07.033

Cited by 48 publications

(27 citation statements)

References 37 publications

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“…A second point is that the procedure supposes a constant compliance of the system. As a matter of fact, we showed recently by molecular dynamic analysis that the bulk modulus is obtained by indentation instead of the Young's modulus [10]. Moreover, in the same paper we showed that the compliance of the system depends on the indentation conditions in accordance to the observations of Fischer-Cripps [9] on the effect of nature, geometry, mounting of the sample on the total compliance of the system.…”

Section: Introductionsupporting

confidence: 81%

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Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Chicot¹,

Tricoteaux²,

Lesage³

et al. 2013

NJGC

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Instrumented indentation has been developed for determining the mechanical properties of materials but an accurate determination of these properties requires attention on contact stiffness analysis, indentation size effect, elastic modulus mode of calculation, role of stress distribution around the indent and its introduction in expanding cavity models for tensile mechanical properties determination. In the present work, models for hardness, elastic modulus and plastic properties determination by indentation are briefly reviewed and applied for the characterization of a porosity-free β-TCP bioceramic. As a main result the elastic modulus is found to be equal to 162 GPa resulting from the application of different approaches based on the use of various sharp and spherical indenters. Additionally, Martens and contact macrohardnesses were found to be independent on the dwell-time and equals to 4.1 and 6.3 GPa, respectively. Finally, models based on Hollomon's and Ludwik's laws as well as expanding cavity models were critically analyzed in light of their capacity to determine the yield stress and to represent the behavior law of the material. As a main result, the yield stress of the β-TCP is found to be equal to 2 GPa.

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Section: Introductionsupporting

confidence: 81%

“…In a previous work [10], we proposed a modification of Equation (3) taking into account all these aspects for the calculation of the elastic modulus:…”

Section: Elastic Modulusmentioning

confidence: 99%

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Chicot¹,

Tricoteaux²,

Lesage³

et al. 2013

NJGC

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“…(1). Since the frame compliance of the instrument, C f , depends on the sample/instrument couple and on the indentation test conditions in microindentation [21,55,56], its value must be determined for each set of indentation tests. For a coated system, the frame compliance can be determined by employing the model of Tricoteaux et al [5].…”

Section: Resultsmentioning

confidence: 99%

“…Such a negative value can be surprising but its variation is complex and the origins of such variation are large, like the frame compliance of the instrument, the mounting system, presence of glue or epoxy resin, indenter fixing, testing conditions, roughness, etc. [21,56]. On the other hand, its value can be also greatly affected by the scatter of the measurements of the composite reduced elastic modulus due to the substrate roughness and the variation of the film thickness.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the frame compliance is considered to have a constant value in nanoindentation, whereas Chicot et al [21] have shown that, in microindentation, the compliance term depends on the specimen mounting, shape and nature of the sample and testing conditions. Consequently, the frame compliance does not have a constant value for relative high loads and its value must be taken into account for each set of indentation data analyses.…”

Section: Introductionmentioning

confidence: 99%

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An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

Hemmouche¹,

Chicot²,

Amrouche³

et al. 2013

Materials Science and Engineering: A

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tThe elastic modulus of thin films can be directly determined by instrumented indentation when the indenter penetration does not exceed a fraction of the film thickness, depending on the mechanical properties of both film and substrate. When it is not possible, application of models for separating the contribution of the substrate is necessary. In this work, the robustness of several models is analyzed in the case of the elastic modulus determination of a porous aluminium oxide film produced by anodization of an aluminium alloy. Instrumented indentation tests employing a Berkovich indenter were performed at a nanometric scale, which allowed a direct determination of the film elastic modulus, whose value was found to be approximately 11 GPa. However, at a micrometric scale the elastic modulus tends toward the value corresponding to the substrate, of approximately 73 GPa. The objective of the present work is to apply different models for testing their consistency over the complete set of indentation data obtained from both classical tests in microindentation and the continuous stiffness measurement mode in nanoindentation. This approach shows the continuity between the two scales of measurement thus allowing a better representation of the elastic modulus variation between two limits corresponding to the substrate and film elastic moduli. Gao's function proved to be the best to represent the elastic modulus variation.

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A new composition–processing–property relationship for studying the tensile modulus‐phase plastic blends

Jodeh

2011

J of Applied Polymer Sci

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Based on thermodynamic principles, a composition-processing-property relationship for predicting the modulus properties of multiphase plastic blends has been developed. This relationship describes the relative modulus of the blend in terms of the volume fraction and the index for the degree of mixing of an inclusionpolymer in the matrix-polymer. The relative modulus is defined as the ratio between the modulus of the blend and that of the matrix polymer. These blends include a nylon 6,6/polymethyl methacrylate(PMMA) system mixed using an injection molding process arid a nylon 6/ ethylene-vinyl acetate copolymer system mixed using a corotational extrusion process. Based on the values determined for the mixing index of the nylon 6,6/PMMA blends, a relationship between the mixing index and the fill time used in the injection molding has been developed. The results also imply that the degree of mixing of the blend mixed using a correlation extrusion process is better than that of the blend processed using an injection molding process. Using the above results, we now can scientifically develop new plastic blends and design optimum processing conditions for various automotive applications.

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Influence of visco-elasto-plastic properties of magnetite on the elastic modulus: Multicyclic indentation and theoretical studies

Cited by 48 publications

References 37 publications

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

A new composition–processing–property relationship for studying the tensile modulus‐phase plastic blends

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Influence of visco-elasto-plastic properties of magnetite on the elastic modulus: Multicyclic indentation and theoretical studies

Cited by 48 publications

References 37 publications

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (&lt;i&gt;β&lt;/i&gt;-TCP) Ceramic by Sharp and Spherical Indentations

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (&lt;i&gt;β&lt;/i&gt;-TCP) Ceramic by Sharp and Spherical Indentations

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

A new composition–processing–property relationship for studying the tensile modulus‐phase plastic blends

Contact Info

Product

Resources

About

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations