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Indentation by nominally flat or conical indenters with rounded corners

Indentation by nominally flat or conical indenters with rounded corners
Indentation by nominally flat or conical indenters with rounded corners
Axisymmetric indentation of a flat surface is considered: specifically, the case of flat-ended indenter with rounded edges, and the case of a shallow cone with a rounded tip. Analytical solutions are obtained for the normal and sequential tangential loading, in both full or partial slip conditions (with the Cattaneofn9Mindlin approximation) , and for the complete interior stress field in all these conditions.
Implications for strength of the contact are discussed with reference to metallic or brittle materials, with the intention to shed more light in particular to the understanding of common fretting fatigue or indentation testings with nominally flat or conical indenters. It is found that the strength of the contact, which is nominally zero for perfectly sharp flat or conical indenters, is well defined even for a small radius of curvature. This is particularly true for the flat indenter, for which the strength is even significantly higher than for the classical Hertzian indenter for a wide range of geometrical and loading conditions, rendering it very attractive for design purposes.
flat punch, conical punch, indentation testing, fretting fatigue testing
0020-7683
4149-4181
Ciavarella, Michele
3de51b62-4f69-4369-9f4d-a743d6950daa
Ciavarella, Michele
3de51b62-4f69-4369-9f4d-a743d6950daa

Ciavarella, Michele (1999) Indentation by nominally flat or conical indenters with rounded corners. International Journal of Solids and Structures, 36 (27), 4149-4181. (doi:10.1016/S0020-7683(98)00186-3).

Record type: Article

Abstract

Axisymmetric indentation of a flat surface is considered: specifically, the case of flat-ended indenter with rounded edges, and the case of a shallow cone with a rounded tip. Analytical solutions are obtained for the normal and sequential tangential loading, in both full or partial slip conditions (with the Cattaneofn9Mindlin approximation) , and for the complete interior stress field in all these conditions.
Implications for strength of the contact are discussed with reference to metallic or brittle materials, with the intention to shed more light in particular to the understanding of common fretting fatigue or indentation testings with nominally flat or conical indenters. It is found that the strength of the contact, which is nominally zero for perfectly sharp flat or conical indenters, is well defined even for a small radius of curvature. This is particularly true for the flat indenter, for which the strength is even significantly higher than for the classical Hertzian indenter for a wide range of geometrical and loading conditions, rendering it very attractive for design purposes.

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More information

Published date: 1999
Keywords: flat punch, conical punch, indentation testing, fretting fatigue testing

Identifiers

Local EPrints ID: 23223
URI: http://eprints.soton.ac.uk/id/eprint/23223
ISSN: 0020-7683
PURE UUID: b2eb1846-a85c-46f8-90d7-206c92edac32

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Date deposited: 27 Mar 2006
Last modified: 15 Mar 2024 06:45

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Author: Michele Ciavarella

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