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
Microhardness of SiO2 Glass in Various Environments
Kazuyuki Hirao,Minoru Tomozawa +1 more
TL;DR: Mesure de microdurete de verre de silice dans divers liquides aqueux ou non L'initiation de la fissure ne depend du temps que dans l'eau L'etude est faite par spectrometrie IR a transformee de Fourier as discussed by the authors.
Journal ArticleDOI
Surface softening in silicon by ion implantation
P. J. Burnett,Trevor F. Page +1 more
TL;DR: Load-variant microhardness tests have been used to investigate the hardness behavior of ion-implanted (1 1 1) silicon wafers as mentioned in this paper, and it is concluded that the amorphous layer produced by implantation appears to show no variation of micro-hardness with load and has a hardness typically between 400 and 700 VHN.
Journal ArticleDOI
Wear of conventional pearlitic and improved bainitic rail steels
TL;DR: In this paper, the micro-Vickers and Rockwell C hardness measurements at different length scales were conducted to investigate the cause of the wear behavior of bainitic and pearlitic rail steels.
Journal ArticleDOI
Age-dependent regional mechanical properties of the rat hippocampus and cortex.
TL;DR: Region-dependent mechanical properties for subregions of the cortex and hippocampus in P10, P17, and adult rats are measured to hypothesize mechanistic models for describing the mechanical behavior of brain tissue as well as to predict relative differences between brain tissue mechanical properties of other species, at different ages, and for different regions based on differences in tissue composition.
Journal ArticleDOI
Adhesion and micromechanical properties of metal surfaces
TL;DR: In this article, a fine pointed stylus of tungsten and a single crystal of a softer metal (nickel) was used to measure the friction and adhesion of a model microasperity.
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.