2D mapping of plane stress crack-tip fields following an overload
The evolution of crack-tip strain fields in a thin (plane stress) compact tension sample following an overload (OL) event has been studied using two different experimental techniques. Surface behaviour has been characterised by Digital Image Correlation (DIC), while the bulk behaviour has been char...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2015-06-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/1485 |
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| author | P. J. Withers P. Lopez-Crespo M. Mostafavi A. Steuwer J. F. Kelleher T. Buslaps |
| author_facet | P. J. Withers P. Lopez-Crespo M. Mostafavi A. Steuwer J. F. Kelleher T. Buslaps |
| author_sort | P. J. Withers |
| collection | DOAJ |
| description | The evolution of crack-tip strain fields in a thin (plane stress) compact tension sample following an overload (OL) event has been studied using two different experimental techniques. Surface behaviour has been characterised by Digital Image Correlation (DIC), while the bulk behaviour has been characterised by means of
synchrotron X-ray diffraction (XRD). The combination of both surface and bulk information allowed us to
visualise the through-thickness evolution of the strain fields before the OL event, during the overload event,
just after OL and at various stages after it. Unlike previous work, complete 2D maps of strains around the
crack-tip were acquired at 60?m spatial resolution by XRD. The DIC shows less crack opening after overload
and the XRD a lower crack-tip peak stress after OL until the crack has grown past the compressive crack-tip
residual stress introduced by the overload after which the behaviour returned to that for the baseline fatigue
response. While the peak crack-tip stress is supressed by the compressive residual stress, the crack-tip stress
field changes over each cycle are nevertheless the same for all Kmax cycles except at OL. |
| format | Article |
| id | doaj-art-e507576d7ce141d38372d64abcce00f9 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2015-06-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-e507576d7ce141d38372d64abcce00f92025-01-02T23:01:26ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932015-06-019332D mapping of plane stress crack-tip fields following an overloadP. J. WithersP. Lopez-CrespoM. MostafaviA. SteuwerJ. F. KelleherT. BuslapsThe evolution of crack-tip strain fields in a thin (plane stress) compact tension sample following an overload (OL) event has been studied using two different experimental techniques. Surface behaviour has been characterised by Digital Image Correlation (DIC), while the bulk behaviour has been characterised by means of synchrotron X-ray diffraction (XRD). The combination of both surface and bulk information allowed us to visualise the through-thickness evolution of the strain fields before the OL event, during the overload event, just after OL and at various stages after it. Unlike previous work, complete 2D maps of strains around the crack-tip were acquired at 60?m spatial resolution by XRD. The DIC shows less crack opening after overload and the XRD a lower crack-tip peak stress after OL until the crack has grown past the compressive crack-tip residual stress introduced by the overload after which the behaviour returned to that for the baseline fatigue response. While the peak crack-tip stress is supressed by the compressive residual stress, the crack-tip stress field changes over each cycle are nevertheless the same for all Kmax cycles except at OL.https://www.fracturae.com/index.php/fis/article/view/1485Bainitic steel |
| spellingShingle | P. J. Withers P. Lopez-Crespo M. Mostafavi A. Steuwer J. F. Kelleher T. Buslaps 2D mapping of plane stress crack-tip fields following an overload Fracture and Structural Integrity Bainitic steel |
| title | 2D mapping of plane stress crack-tip fields following an overload |
| title_full | 2D mapping of plane stress crack-tip fields following an overload |
| title_fullStr | 2D mapping of plane stress crack-tip fields following an overload |
| title_full_unstemmed | 2D mapping of plane stress crack-tip fields following an overload |
| title_short | 2D mapping of plane stress crack-tip fields following an overload |
| title_sort | 2d mapping of plane stress crack tip fields following an overload |
| topic | Bainitic steel |
| url | https://www.fracturae.com/index.php/fis/article/view/1485 |
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