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Abstract
Depth-sensing indentation (DSI) technique allows easy and reliable determination of two mechanical properties of materials: hardness and Young’s modulus. Most of the studies are focusing on the Vickers, Berkovich, and conical indenter geometries. In case of Knoop indenter, the existing experimental and numerical studies are scarce. The goal of the current study is to contribute for the understanding of the mechanical phenomena that occur in the material under Knoop indention, enhancing and facilitating the analysis of its results obtained in DSI tests. For this purpose, a finite element code, DD3IMP, was used to numerically simulate the Knoop indentation test. A finite element mesh was developed and optimized in order to attain accurate values of the mechanical properties. Also, a careful modeling of the Knoop indenter was performed to take into account the geometry and size of the imperfection (offset) of the indenter tip, as in real cases.
Highlights
Depth-sensing indentation (DSI) tests are typically used to evaluate the hardness and Young’s modulus of materials
The most common hardness testing methods were developed in the early twentieth century
Hardness tests with the Knoop indenter have been valuable in the mechanical characterization of some materials, such as thin coatings [6,7] and biological materials
Summary
Depth-sensing indentation (DSI) tests are typically used to evaluate the hardness and Young’s modulus of materials. They can be used to extract the uniaxial mechanical properties of bulk and composite materials, such as the yield stress and the strain hardening parameter (see, e.g., [1,2,3,4]). The most common hardness testing methods were developed in the early twentieth century They are typically performed using spherical, conical and pyramidal indenters with Vickers and Berkovich geometries. Hardness tests with the Knoop indenter have been valuable in the mechanical characterization of some materials, such as thin coatings [6,7] and biological materials (e.g., dental tissue [8]). Another important application of this hardness tests is in the field of the gradient materials obtained by severe plastic deformation (see, e.g., [9,10,11]), for which it is required to determine the mechanical properties in thin samples and/or thin surface layers of the samples
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