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Indentation

About: Indentation is a research topic. Over the lifetime, 13002 publications have been published within this topic receiving 340476 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors investigated the irradiation hardening of Fe-based model ferritic alloys after Fe-ion irradiation experiments in order to deduce mechanistically based nominal hardness from the nano-indentation tests on the ion-irradiated surface.

190 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of crystallographic orientation on fracture toughness and the fracture path of silicon single crystal was investigated Vickers microhardness indentation was used to introduce cracks along various crystallographic orientations on the (110, (001), and (111) planes.
Abstract: In this study the effect of crystallographic orientation on fracture toughness and the fracture path of silicon single crystal was investigated Vickers microhardness indentation was used to introduce cracks along various crystallographic orientations on the (110), (001), and (111) planes The fracture toughness variation was found to follow the symmetry of the indentation axis with no distinct correlation with the elastic constants The observations made suggest that the inclination angle of cleavage planes relative to the indent plane affects the fracture path and toughness significantly Prestraining decreased the hardness and improved the toughness without a modification of fracture path

189 citations

Journal ArticleDOI
TL;DR: Quantitative polarized light microscopy measurements from canine cartilage were utilized to characterize thickness and structure of the superficial, collageneous tissue layer as well as to reveal its relation to experimental indentation measurements, and FE results indicated effective stiffening of articular cartilage under indentation due to high transverse modulus of the deep tissue layer.

189 citations

Journal ArticleDOI
R Rodriguez1, I. Gutiérrez1
TL;DR: The nanoindentation test has become one of the most broadly expanded techniques used to measure the mechanical properties in a sub-micron range as mentioned in this paper, however, the interpretation of the data is very difficult due to the Indentation Size Effect (ISE), defined as an increase of the nanohardness by decreasing the indentation depth.
Abstract: The nanoindentation test has become one of the most broadly expanded techniques used to measure the mechanical properties in a sub-micron range. However, the interpretation of the data is very difficult due to the Indentation Size Effect (ISE). The ISE can be defined as an increase of the nanohardness by decreasing the indentation depth of the test. In the present work, the ISE of different metals has been studied by performing nanoindentation tests at different imposed depths. Furthermore, tensile tests of these materials have been carried out in order to determine empirical relations between the nanoindentation test results and the tensile properties.

189 citations

Journal ArticleDOI
19 Sep 2012-PLOS ONE
TL;DR: Analysis of the response of single 3T3 fibroblasts that were indented with a micrometer-sized bead attached to an AFM cantilever at forces from 30–600 pN found that at such small deformations, the elastic modulus of 100 Pa is largely determined by the presence of the actin cortex.
Abstract: The measurement of the elastic properties of cells is widely used as an indicator for cellular changes during differentiation, upon drug treatment, or resulting from the interaction with the supporting matrix. Elasticity is routinely quantified by indenting the cell with a probe of an AFM while applying nano-Newton forces. Because the resulting deformations are in the micrometer range, the measurements will be affected by the finite thickness of the cell, viscous effects and even cell damage induced by the experiment itself. Here, we have analyzed the response of single 3T3 fibroblasts that were indented with a micrometer-sized bead attached to an AFM cantilever at forces from 30-600 pN, resulting in indentations ranging from 0.2 to 1.2 micrometer. To investigate the cellular response at lower forces up to 10 pN, we developed an optical trap to indent the cell in vertical direction, normal to the plane of the coverslip. Deformations of up to two hundred nanometers achieved at forces of up to 30 pN showed a reversible, thus truly elastic response that was independent on the rate of deformation. We found that at such small deformations, the elastic modulus of 100 Pa is largely determined by the presence of the actin cortex. At higher indentations, viscous effects led to an increase of the apparent elastic modulus. This viscous contribution that followed a weak power law, increased at larger cell indentations. Both AFM and optical trapping indentation experiments give consistent results for the cell elasticity. Optical trapping has the benefit of a lower force noise, which allows a more accurate determination of the absolute indentation. The combination of both techniques allows the investigation of single cells at small and large indentations and enables the separation of their viscous and elastic components.

188 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023517
20221,124
2021457
2020510
2019566
2018526