Journal ArticleDOI
The correlation of indentation experiments
TLDR
In this article, a simplified theoretical model of this behaviour is obtained by extending R. Hill's theory of expanding a cylindrical or spherical cavity in an elastic-plastic material to ensure compatibility between the volume of material displaced by the indenter and that accommodated by elastic expansion.Abstract:
The theory of rigid perfectly-plastic solids predicts indentation pressures, using wedge-shaped or conical indenters, which depend only on the geometry of the indenter and the yield stress of the material. With blunt wedges or with materials having a low ratio of Young's modulus, E, to yield stress, Y, the material displaced by the indenter is accommodated by an approximately radial expansion of the surrounding material. The indentation pressure then falls below the rigid perfectly-plastic value. In these circumstances, measurements of indentation pressure for a variety of indenter geometries are shown to correlate with the single parameter (E/Y) tan β, where β is the angle of inclination of the indenter to the surface at the edge of the indentation. This parameter may be interpreted as the ratio of the strain imposed by the indenter to the yield strain of the material.
A simplified theoretical model of this behaviour is obtained by extending R. Hill's theory of expanding a cylindrical or spherical cavity in an elastic-plastic material to ensure compatibility between the volume of material displaced by the indenter and that accommodated by elastic expansion.read more
Citations
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Journal ArticleDOI
Application of the Improved Inclusion Core Model of the Indentation Process for the Determination of Mechanical Properties of Materials
TL;DR: In this article, the improved Johnson inclusion core model of indentation by conical and pyramidal indenters in which indenter is elastically deformed and a specimen is elastoplastically deformed under von Mises yield condition, was used for determination of mechanical properties of materials with different types of interatomic bond and different crystalline structures.
Journal ArticleDOI
Environmentally enhanced crack propagation in a chemically degrading isotropic shale
Manman Hu,Tomasz Hueckel +1 more
TL;DR: In this paper, a geomaterial subject to weakening by the presence of water, which dissolves a mineral component, is studied and the behavior of the material is rigid-plastic with chemical softening.
Journal ArticleDOI
Numerical modeling of normal wedge indentation in rocks with lateral confinement
TL;DR: In this paper, the authors investigated the influence of the lateral confining stress σ 0 on the development of the plastic zone under the indenter and on the initiation of tensile fractures.
Journal ArticleDOI
Adhesion and dynamic impact wear of nanocomposite TiC-based coatings prepared by DCMS and HiPIMS
Josef Daniel,Pavel Souček,Jan Grossman,Lukáš Zábranský,Katarína Bernátová,Vilma Buršíková,Tomáš Fořt,Petr Vašina,Jaroslav Sobota +8 more
TL;DR: In this article, two series of nc-TiC/a-C:H coatings with a different amount of carbon were deposited onto commonly used industrial cemented tungsten carbide substrates using DC magnetron sputtering (DCMS) and the high power impulse magnetron stuttering (HiPIMS), respectively, in argon and acetylene mixture atmosphere.
Journal ArticleDOI
On the Mechanical Behavior of Global Parameters in Material Characterization by Sharp Indentation Testing
TL;DR: In this article, the behavior of global contact quantities, such as mean contact pressure and the size of the contact area, in the transition region where elastic and plastic effects are of equal magnitude, is examined theoretically and numerically.
References
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Book
Theory of elasticity
TL;DR: The theory of the slipline field is used in this article to solve the problem of stable and non-stressed problems in plane strains in a plane-strain scenario.
Book
The mathematical theory of plasticity
TL;DR: In this paper, the solution of two-dimensional non-steady motion problems in two dimensions is studied. But the solution is not a solution to the problem in three dimensions.
Journal ArticleDOI
The Elastic Contact of Rough Spheres
J. A. Greenwood,J. H. Tripp +1 more
TL;DR: In this article, the Hertzian theory of elastic contact between spheres is extended by considering one of the spheres to be rough, so that contact occurs, as in practice, at a number of discrete microcontacts.