Method to account for true contact area in soda-lime glass during nanoindentation with the Berkovich tip

Kese, Kwadwo; Li, Zhicheng; Bergman, Bill

doi:10.1016/j.msea.2005.06.006

Cited by 84 publications

(71 citation statements)

References 16 publications

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“…Measuring the contact area by the AFM line profiles for the pyramidal tips was attempted according to a method proposed by Kese et al [31]. This approach assumed that the additional contact area was in the form of a semi-ellipse with a chord length equal to the flat edge of the indentation impression and a segment height equal to width measurements of the pile-up in contact with the tip.…”

Section: Indentation Sink-in and Pile-upmentioning

confidence: 99%

Understanding the effects of ion irradiation using nanoindentation techniques

Hardie

Roberts

Bushby

2015

Journal of Nuclear Materials

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The effects of ion irradiation in materials for research are usually limited to a shallow surface layer of the order of one micrometre in depth. Determining the mechanical properties of such irradiated materials requires techniques with high spatial resolution. Nanoindentation is a relatively simple method for investigating these shallow layers with the advantage that statistically rich data sets for elastic and plastic property values can be generated. However, interpretation of the results requires and understanding of the material response, including the extent of the plastic zone with respect to the irradiated layer, pile-up or sink-in of material around the indentation site that affect the calculated contact area and hence derived mechanical property values. An Fe + self-irradiated Fe12%Cr alloy was investigated with three different indenter tip geometries, a Cube corner, Berkovich and 10 micron radius indenter. Sharp indenters provide sufficiently small plastic zones to be contained within the irradiated layer but pop-in events and pile-up need to be taken into account for correct interpretation of the mechanical properties of the irradiated material.

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Section: Indentation Sink-in and Pile-upmentioning

confidence: 99%

Understanding the effects of ion irradiation using nanoindentation techniques

Hardie

Roberts

Bushby

2015

Journal of Nuclear Materials

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“…Unfortunately, there are not many nanoindentation studies available on glass, and the information on loading rate effects on nanohardness of glass is very sparse. [13,[19][20][21][22][23][24][25][26][27] Nanohardness of soda-lime glass was either slightly reduced, when measured inside the deformation zone created by a macroindent, [22] or remained load independent, [23,25,26] or its load dependency was well described by Meyer's law. [24,27] The fracture response with the cube-corner nanoindenter in both soda-lime-silica and fused silica glasses was difficult to model.…”

Section: Introductionmentioning

confidence: 99%

Loading Rate Effect on Nanohardness of Soda-Lime-Silica Glass

Chakraborty

Dey

Mukhopadhyay

2010

Metall Mater Trans A

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To understand how hardness, the key design parameter for applications of brittle solids such as glass concerning contact deformation, is affected by loading rate variation, nanoindentation with a Berkovich tip was used to measure the nanohardness of a 330-lm-thick soda-lime-silica glass as a function of loading rate (1 to 1000 mNAEs À1 ). The results showed for the very first time that, with variations in the loading rate, there was a 6 to 9 pct increase in the nanohardness of glass up to a threshold loading rate (TLR), whereafter it did not appreciably increase with further increase in loading rate. Further, the nanohardness data showed an indentation size effect (ISE) that obeyed the Meyer's law. These observations were explained in terms of a strong shear stress component developed just beneath the nanoindenter and the related shear-induced deformation processes at local microstructural scale weak links. The significant or insignificant presence of shear-induced serrations in load depth plots and corresponding scanning electron microscopic evidence of a strong or mild presence of shear deformation bands in and around the nanoindentation cavity supported such a rationalization. Finally, a qualitative picture was developed for different deformation processes induced at various loading rates in glass.

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“…2. We have used atomic force microscopy (AFM) technique to visualize the imaging profile of all the indents and also subtracted the 'pile-up' contribution to the obtained contact area from the indentation experiment following the method proposed by Kese et al [17]. The corrected values of hardness obtained from the nano-indentation experiment are in good agreement with the values measured by micro-indenter for the same sample.…”

Section: Resultsmentioning

confidence: 65%

“…The study of mechanical properties of bulk metallic glasses (BMGs) is an intriguing field of research from fundamental as well as application point of view [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. One of the major areas of active pursuit being carried out is how to improve the ductility of these materials, an essential factor for structural applications [2][3][4][5]7].…”

Section: Introductionmentioning

confidence: 99%

The observation of surface-softening in Fe-based metallic glass

et al. 2011

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The observation of surface softening in Fe-based metallic glass.In: Mater. Res. Soc. Symp. Proc. Vol. 1300 (pp. 5-) ABSTRACTDepth sensing nano-indentation investigations have been performed to determine the radial dependence of the hardness through the cross section of a Fe-based bulk glassy rod. We have found the hardness of the material decreases along radius from the center to the outermost surface. This phenomenon is attributed to the 'cooling rate induced surface softening'. Furthermore, a significant change (~15 %) in elastic modulus is noticed along the radius as well.

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Method to account for true contact area in soda-lime glass during nanoindentation with the Berkovich tip

Cited by 84 publications

References 16 publications

Understanding the effects of ion irradiation using nanoindentation techniques

Understanding the effects of ion irradiation using nanoindentation techniques

Loading Rate Effect on Nanohardness of Soda-Lime-Silica Glass

The observation of surface-softening in Fe-based metallic glass

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