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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An Experimental Study of the Hertzian Contact of Surfaces Covered by Soft Metal Films
TL;DR: In this paper, the static contact between a steel ball and a lead-plated steel flat was investigated and the normal approach of the surfaces and their area of contact have been measured as functions of normal load and the thickness of the lead film.
Journal ArticleDOI
Experimental study on rock indentation using infrared thermography and acoustic emission techniques
Journal ArticleDOI
Theoretical Study on the TBM Tool-Rock Interaction
N. Innaurato,Pierpaolo Oreste +1 more
TL;DR: In this paper, a model that takes the constitutive law of the rock, the presence of the tunnel head, the discontinuities and the amount of the natural stress due to the high overburden in the case of the forces caused by the TBM disk on a tunnel head into account in the failure mode is considered.
Journal ArticleDOI
A transmission electron microscope study of hardness indentations in MoSi2
TL;DR: In this paper, the authors used transmission electron microscopy and electron diffraction to study hardness indentations made at room temperature in single crystals of MoSi 2 and identified two families of slip systems.
Journal ArticleDOI
Strain and Stress Fields During Scratch Tests on Amorphous Polymers: Influence of the Local Friction
TL;DR: In this paper, the tangential scratch behavior of homogeneous polymeric substrates, considered in first approximation as elastic linear-hardening plastic material, was investigated. But the authors focused on the tangent scratch behavior for only elastic-plastic contacts, without any strain rate or temperature effects, and focused on studying some characteristic response due to spherical scratching process as a function of scratching conditions such as the stress and plastic strain fields.
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.