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The influence of the indenter tip-radius on indentation testing of brittle materials

The influence of the indenter tip-radius on indentation testing of brittle materials
The influence of the indenter tip-radius on indentation testing of brittle materials
Indentation testing of a brittle material using a notionally ‘sharp’ indenter may reveal several important physical properties, including fracture toughness, surface finish information and the residual stress state. In the case of shallow cone indenters, the contact and fracture mechanics is well defined and closed-form solutions exist in elasticity theory. However, no real indenter is atomically sharp, and the scope of the present article is to quantify how a finite apex radius may modify the stress state induced by a conical indenter. In particular, implications for the load-displacement relation, occurrence of yielding and maximum contact pressure induced are found. A brief discussion of the influence of edge radius on the flat-ended indenter, once used to induce Hertzian type ring cracks, is also included, as this may be treated by a similar procedure
indentation testing, fracture, toughness, mechanical properties, surfaces
0955-2219
239-245
Ciavarella, M.
d5aa6350-b3d4-4a78-a670-9d78242f58c5
Hills, D.A.
d7ac6eb1-a16e-4a2c-b3ff-86e82cfbf3d6
Ciavarella, M.
d5aa6350-b3d4-4a78-a670-9d78242f58c5
Hills, D.A.
d7ac6eb1-a16e-4a2c-b3ff-86e82cfbf3d6

Ciavarella, M. and Hills, D.A. (1999) The influence of the indenter tip-radius on indentation testing of brittle materials. Journal of the European Ceramic Society, 19 (2), 239-245. (doi:10.1016/S0955-2219(98)00188-5).

Record type: Article

Abstract

Indentation testing of a brittle material using a notionally ‘sharp’ indenter may reveal several important physical properties, including fracture toughness, surface finish information and the residual stress state. In the case of shallow cone indenters, the contact and fracture mechanics is well defined and closed-form solutions exist in elasticity theory. However, no real indenter is atomically sharp, and the scope of the present article is to quantify how a finite apex radius may modify the stress state induced by a conical indenter. In particular, implications for the load-displacement relation, occurrence of yielding and maximum contact pressure induced are found. A brief discussion of the influence of edge radius on the flat-ended indenter, once used to induce Hertzian type ring cracks, is also included, as this may be treated by a similar procedure

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Published date: 1999
Keywords: indentation testing, fracture, toughness, mechanical properties, surfaces

Identifiers

Local EPrints ID: 23253
URI: http://eprints.soton.ac.uk/id/eprint/23253
ISSN: 0955-2219
PURE UUID: 6bed683a-a943-4ab6-8458-3f6c2129286c

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Date deposited: 01 Feb 2007
Last modified: 19 Jul 2019 19:10

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