Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading
This paper describes the experimental measurement of near-tip displacement fields for a fatigue crack growing in a small compact-tension specimen. The specimen is pre-cracked conventionally, but then loaded in-situ in a scanning electron microscope. Digital image correlation is applied to the imag...
| Main Authors: | , , |
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| Format: | Journal article |
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Elsevier
2016
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| _version_ | 1797063420422389760 |
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| author | Nowell, D O'Connor, S Dragnevski, K |
| author_facet | Nowell, D O'Connor, S Dragnevski, K |
| author_sort | Nowell, D |
| collection | OXFORD |
| description | This paper describes the experimental measurement of near-tip displacement fields for a fatigue crack growing in a small compact-tension specimen. The specimen is pre-cracked conventionally, but then loaded in-situ in a scanning electron microscope. Digital image correlation is applied to the images collected and is analysed using an elastic model to produce stress intensity factor histories. A simple elastic/plastic model due to Pommier and Hamam is also applied, and the resulting behaviour is discussed. A single overload is applied to the specimen, and the effect of this on the elastic and elastic-plastic results is examined. The results are also compared to earlier work of a similar nature using a long-distance microscope, which gives an understanding of crack behaviour at a macroscopic length scale. |
| first_indexed | 2024-03-06T20:59:36Z |
| format | Journal article |
| id | oxford-uuid:3a6f16ed-8816-44df-aac8-8226cd300ceb |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:59:36Z |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:3a6f16ed-8816-44df-aac8-8226cd300ceb2022-03-26T14:01:32ZMeasurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loadingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3a6f16ed-8816-44df-aac8-8226cd300cebSymplectic Elements at OxfordElsevier2016Nowell, DO'Connor, SDragnevski, KThis paper describes the experimental measurement of near-tip displacement fields for a fatigue crack growing in a small compact-tension specimen. The specimen is pre-cracked conventionally, but then loaded in-situ in a scanning electron microscope. Digital image correlation is applied to the images collected and is analysed using an elastic model to produce stress intensity factor histories. A simple elastic/plastic model due to Pommier and Hamam is also applied, and the resulting behaviour is discussed. A single overload is applied to the specimen, and the effect of this on the elastic and elastic-plastic results is examined. The results are also compared to earlier work of a similar nature using a long-distance microscope, which gives an understanding of crack behaviour at a macroscopic length scale. |
| spellingShingle | Nowell, D O'Connor, S Dragnevski, K Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading |
| title | Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading |
| title_full | Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading |
| title_fullStr | Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading |
| title_full_unstemmed | Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading |
| title_short | Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading |
| title_sort | measurement of fatigue crack deformation on the macro and micro scale uniform and non uniform loading |
| work_keys_str_mv | AT nowelld measurementoffatiguecrackdeformationonthemacroandmicroscaleuniformandnonuniformloading AT oconnors measurementoffatiguecrackdeformationonthemacroandmicroscaleuniformandnonuniformloading AT dragnevskik measurementoffatiguecrackdeformationonthemacroandmicroscaleuniformandnonuniformloading |