Fracture toughness, surface flaw sizes and flaw densities in Al2O3
Surface flaw sizes and flaw densities on polished dense polycrystalline alumina specimens with grain sizes G = 1.2, 3.8 and 14.1 μm were measured using Hertzian indentation. Two surface finishes were studied: well-polished (Syton) and coarse-polished (45 μm diamond paste). Flaw sizes and densities d...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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1997
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| _version_ | 1797089471471026176 |
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| author | Franco, A Roberts, S Warren, P |
| author_facet | Franco, A Roberts, S Warren, P |
| author_sort | Franco, A |
| collection | OXFORD |
| description | Surface flaw sizes and flaw densities on polished dense polycrystalline alumina specimens with grain sizes G = 1.2, 3.8 and 14.1 μm were measured using Hertzian indentation. Two surface finishes were studied: well-polished (Syton) and coarse-polished (45 μm diamond paste). Flaw sizes and densities depended on the surface finish and increased with increasing grain size. Fine grained specimens exhibited a high density of small flaws while coarse grained specimens exhibited a higher density of larger flaws. Fracture toughness (Klc) for each material (relating to the propagation of flaws of a few μm depth) was determined from the minimum fracture load in a series of Hertzian tests. Klc, values were 3.58, 3.45 and 2.96 MPam1 2 for G = 1.2. 3.8 and 14.1 μm, respectively. Fracture toughness values were also determined by Vickers indentation over a range of loads; the Klc values determined from the Hertzian tests were consistent with the trends in Klc with crack size from the Vickers indentation tests. Copyright © 1997 Acta Metallurgica Inc. |
| first_indexed | 2024-03-07T03:04:33Z |
| format | Journal article |
| id | oxford-uuid:b20cba0e-b550-4a6d-b3cf-23a447b833f8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:04:33Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:b20cba0e-b550-4a6d-b3cf-23a447b833f82022-03-27T04:08:56ZFracture toughness, surface flaw sizes and flaw densities in Al2O3Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b20cba0e-b550-4a6d-b3cf-23a447b833f8EnglishSymplectic Elements at Oxford1997Franco, ARoberts, SWarren, PSurface flaw sizes and flaw densities on polished dense polycrystalline alumina specimens with grain sizes G = 1.2, 3.8 and 14.1 μm were measured using Hertzian indentation. Two surface finishes were studied: well-polished (Syton) and coarse-polished (45 μm diamond paste). Flaw sizes and densities depended on the surface finish and increased with increasing grain size. Fine grained specimens exhibited a high density of small flaws while coarse grained specimens exhibited a higher density of larger flaws. Fracture toughness (Klc) for each material (relating to the propagation of flaws of a few μm depth) was determined from the minimum fracture load in a series of Hertzian tests. Klc, values were 3.58, 3.45 and 2.96 MPam1 2 for G = 1.2. 3.8 and 14.1 μm, respectively. Fracture toughness values were also determined by Vickers indentation over a range of loads; the Klc values determined from the Hertzian tests were consistent with the trends in Klc with crack size from the Vickers indentation tests. Copyright © 1997 Acta Metallurgica Inc. |
| spellingShingle | Franco, A Roberts, S Warren, P Fracture toughness, surface flaw sizes and flaw densities in Al2O3 |
| title | Fracture toughness, surface flaw sizes and flaw densities in Al2O3 |
| title_full | Fracture toughness, surface flaw sizes and flaw densities in Al2O3 |
| title_fullStr | Fracture toughness, surface flaw sizes and flaw densities in Al2O3 |
| title_full_unstemmed | Fracture toughness, surface flaw sizes and flaw densities in Al2O3 |
| title_short | Fracture toughness, surface flaw sizes and flaw densities in Al2O3 |
| title_sort | fracture toughness surface flaw sizes and flaw densities in al2o3 |
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