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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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TL;DR: In this article, the results of the experimental study of nano-and micro-indentation size effect on selected (0.0.1) oriented face-centered cubic (fcc) crystals (Ni, Au and Ag) are elucidated.
Abstract: This paper presents the results of the experimental study of nano- and micro-indentation size effect on selected (0 0 1) oriented face-centered cubic (fcc) crystals (Ni, Au and Ag). Following a detailed description of experimental techniques and correction factors, indentation size effects in (0 0 1) oriented Au, Ag and Ni single crystals are elucidated. Material pile-up phenomena are discussed before analyzing the results within the context of mechanism-based strain gradient plasticity (SGP) theories. Microstructure length scales are calculated based on the analysis. These are shown to vary with indentation size. A bi-linear behavior is shown to describe the indentation size effects between the micro- and nano-scales. This is rationalized by considering the limiting cases of plastic deformation by source-limited and established dislocation substructures. A multi-scale framework is proposed for modeling small contacts.

102 citations

Journal ArticleDOI
TL;DR: In this paper, the indentation size effect and pop-in behavior are studied for indentations in undeformed and locally pre-deformed CaF 2 single crystals, using both nanoindentation experiments and molecular dynamics simulations.

102 citations

Journal ArticleDOI
TL;DR: In this article, a unified computational model for both micro-and nano-indentation was developed to understand the breakdown of the Nix-Gao relation at indentation depths approaching the nanometer scale.
Abstract: Nix and Gao established an important relation between microindentation hardness and indentation depth. Such a relation has been verified by many microindentation experiments (indentation depths in the micrometer range), but it does not always hold in nanoindentation experiments (indentation depths approaching the nanometer range). We have developed a unified computational model for both micro- and nanoindentation in an effort to understand the breakdown of the Nix–Gao relation at indentation depths approaching the nanometer scale. The unified computational model for indentation accounts for various indenter shapes, including a sharp, conical indenter, a spherical indenter, and a conical indenter with a spherical tip. It is based on the conventional theory of mechanism-based strain gradient plasticity established from the Taylor dislocation model to account for the effect of geometrically necessary dislocations. The unified computational model for indentation indeed shows that the Nix–Gao relation holds in microindentation with a sharp indenter, but it does not hold in nanoindentation due to the indenter tip radius effect.

102 citations

Journal ArticleDOI
TL;DR: In this article, the elastic modulus of cellulose Iβ in the axial and transverse directions was obtained from atomistic simulations using both the standard uniform deformation approach and a complementary approach based on nanoscale indentation.
Abstract: The elastic modulus of cellulose Iβ in the axial and transverse directions was obtained from atomistic simulations using both the standard uniform deformation approach and a complementary approach based on nanoscale indentation. This allowed comparisons between the methods and closer connectivity to experimental measurement techniques. A reactive force field was used that explicitly describes hydrogen bond, coulombic and van der Waals interactions, allowing each contribution to the inter- and intra-molecular forces to be analyzed as a function of crystallographic direction. The uniform deformation studies showed that the forces dominating elastic behavior differed in the axial and transverse directions because of the relationship between the direction of the applied strain and the hydrogen bonding planes. Simulations of nanoscale indentation were then introduced to model the interaction between a hemispherical indenter with the \((1\bar{1}0)\) surface of a cellulose Iβ rod. The role of indenter size, loading force and indentation speed on the transverse elastic modulus was studied and, for optimized parameters, the results found to be in good agreement with experimentally-measured transverse elastic modulus for individual cellulose crystals.

102 citations

Journal ArticleDOI
TL;DR: In this article, a three-dimensional molecular dynamic (MD) simulation of the nanoindentation of aluminum thin film on silicon substrate is investigated by taking the Lennard-Jones potential to describe the interaction at the film-substrate interface.

102 citations


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