Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading
We have used EBSD orientation mapping and digital image correlation-based strain mapping to investigate inhomogeneous deformation of Ti-6Al-4V in tension, fatigue and cold-dwell fatigue. Strong strain inhomogeneities were found in all loading modes and in each case the pattern of high and low strain...
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| Format: | Journal article |
| Language: | English |
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2012
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| _version_ | 1797074142899470336 |
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| author | Littlewood, P Wilkinson, A |
| author_facet | Littlewood, P Wilkinson, A |
| author_sort | Littlewood, P |
| collection | OXFORD |
| description | We have used EBSD orientation mapping and digital image correlation-based strain mapping to investigate inhomogeneous deformation of Ti-6Al-4V in tension, fatigue and cold-dwell fatigue. Strong strain inhomogeneities were found in all loading modes and in each case the pattern of high and low strain is established relatively early in the tests. Comparing the orientation and strain maps shows that grain-grain interactions are the primary cause of strain concentration. Surface grains with the crystallographic c-axis parallel to the loading direction showed very low strain levels, and neighbouring grains showed exceptionally high strain levels. In both fatigue and dwell fatigue, these regions of high strain concentration were observed to act as sites for crack nucleation. Strain evolution was found to be significantly different in each loading mode; in particular, deformation in dwell fatigue appears to have similarities with creep deformation. © 2012 Elsevier Ltd. All rights reserved. |
| first_indexed | 2024-03-06T23:32:05Z |
| format | Journal article |
| id | oxford-uuid:6c62273a-3d63-4439-adf5-5175f5bb65c9 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:32:05Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:6c62273a-3d63-4439-adf5-5175f5bb65c92022-03-26T19:10:30ZLocal deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loadingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6c62273a-3d63-4439-adf5-5175f5bb65c9EnglishSymplectic Elements at Oxford2012Littlewood, PWilkinson, AWe have used EBSD orientation mapping and digital image correlation-based strain mapping to investigate inhomogeneous deformation of Ti-6Al-4V in tension, fatigue and cold-dwell fatigue. Strong strain inhomogeneities were found in all loading modes and in each case the pattern of high and low strain is established relatively early in the tests. Comparing the orientation and strain maps shows that grain-grain interactions are the primary cause of strain concentration. Surface grains with the crystallographic c-axis parallel to the loading direction showed very low strain levels, and neighbouring grains showed exceptionally high strain levels. In both fatigue and dwell fatigue, these regions of high strain concentration were observed to act as sites for crack nucleation. Strain evolution was found to be significantly different in each loading mode; in particular, deformation in dwell fatigue appears to have similarities with creep deformation. © 2012 Elsevier Ltd. All rights reserved. |
| spellingShingle | Littlewood, P Wilkinson, A Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading |
| title | Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading |
| title_full | Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading |
| title_fullStr | Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading |
| title_full_unstemmed | Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading |
| title_short | Local deformation patterns in Ti-6Al-4V under tensile, fatigue and dwell fatigue loading |
| title_sort | local deformation patterns in ti 6al 4v under tensile fatigue and dwell fatigue loading |
| work_keys_str_mv | AT littlewoodp localdeformationpatternsinti6al4vundertensilefatigueanddwellfatigueloading AT wilkinsona localdeformationpatternsinti6al4vundertensilefatigueanddwellfatigueloading |