Results 311 to 320 of about 44,589 (331)

Indentation hardness testing of rock

International Journal of Rock Mechanics and Mining Sciences, 1998
The indentation testing was used for characterisation of hardness of rock materials. During the test, an indentor under applied load penetrated into the rock surface forming a crater. The testing procedure was developed to be in line with other ISRM Suggested Methods. The results show that standardised indentation testing allows for characterisation of
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The theory of indentation and hardness tests

Proceedings of the Physical Society, 1945
A discussion is given of the indentation of ductile materials by cylindrical punches with conical heads. On the experimental side, experiments have been made with work-hardened and with annealed copper, with penetrations up to nine times the diameter of the punch. It is found that the load rises towards a maximum value which is not approached until the
R F Bishop, N F Mott, R Hill
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The Influence of Indenter Tip Radius on the Micro-Indentation Hardness

Journal of Engineering Materials and Technology, 2002
The micro-indentation experiments have shown that the indentation hardness depends not only on the indentation depth but also on the indenter tip radius. In fact, the indentation hardness displays opposite dependence on the indentation depth h for a sharp, conical indenter and for a spherical indenter, decreasing and increasing, respectively, with ...
Yonggang Huang, Zhenyu Xue, Kuo Chu Hwang, Ming Li   +3 more
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Modeling of Indentation of Hard Coatings by an Arbitrarily Shaped Indenter

Journal of Friction and Wear, 2019
A numerical-analytical method is proposed for calculating the contact pressures and internal stresses arising in the coating and substrate during indentation by a smooth indenter of arbitrary shape. This method was used to analyze the indentation of two coating-substrate compositions differing in the thickness of the coating by a Berkovich pyramid ...
Elena Torskaya, F. I. Stepanov
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Scratch and indentation hardness of crystals

Philosophical Magazine A, 1981
Abstract Some comparisons are made between the scratch hardness (Hs), as determined by the width of a groove formed under conditions of plastic deformation, and indentation hardness (H) of crystalline materials. It is shown that the Hs/H ratio is dependent on the ‘effective’ strain developed beneath the indenter.
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Experimental Research on the Influence of Indenter Tip Radius to Indentation Hardness

Applied Mechanics and Materials, 2007
Aiming at the influence law of indenter tip radius to indentation hardness, testing on the hardness of single-crystal silicon was carried out based on nanoindentation technique. Two kinds of Berkovich indenter with radius 40nm and 60nm separately were used in this experiment. According to the load-depth curve, the hardness of single-crystal silicon was
Liang Zhou, Ying Xue Yao, Qiang Liu
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The Indentation and Scratch Hardness of Plastics

Journal of Engineering Materials and Technology, 1973
Static and sliding indentation tests on vinyl chloride-acetate copolymer and nylon 66 are described, and form part of a study of the deformation and wear of gramophone records. The vinyl was unusual in showing considerable work softening. Static indentation tests covered the whole range from the fully elastic to the fully plastic condition, and ...
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Hardness and Normal Indentation of Polymers

1999
The hardness measurement has wide applications in the characterisation of the mechanical and physical properties of materials. This method is frequently used for metals, polymers, ceramics and coatings1. It has been used to relate hardness with certain physical and mechanical properties of materials.
B. J. Briscoe, S. K. Sinha
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Comparison of hardness and Young's modulus by single indentation and multiple unloading indentation

Zeitschrift für Metallkunde, 2004
Abstract Multiple partial unloading indentation is a useful technique for depth-dependent nanoindentation yielding up to 20 hardness and modulus values of different depth with one single measurement. A comparison between multiple partial unloading indentation and conventional single unloading technique is presented.
Rolf L. A. Küster, Kirsten I. Schiffmann   +1 more
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The equivalence of axisymmetric indentation model for three-dimensional indentation hardness

Journal of Materials Research, 2009
Nix and Gao [J. Mech. Phys. Solids46, 411 (1998)] established an important relation between the microindentation hardness and indentation depth for axisymmetric indenters. We use the conventional theory of mechanism-based strain gradient plasticity [Huang et al., Int. J. Plast.20, 753 (2004)] established from the Taylor dislocation model [Taylor, Proc.
Yonggang Huang, K. C. Hwang, Jiang Qin, Jianliang Xiao   +3 more
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