Some experimental observations of crack-tip mechanics with displacement data
In the past two decades, crack-tip mechanics has been increasingly studied with full-field techniques. Within these techniques, Digital Image Correlation (DIC) has been most widely used due to its many advantages, to extract important crack-tip information, including Stress Intensity Factor (SIF),...
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Gruppo Italiano Frattura
2015-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_18.pdf |
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| author | M. Mokhtari P. Lopez-Crespo B. Moreno M. Zanganeh |
| author_facet | M. Mokhtari P. Lopez-Crespo B. Moreno M. Zanganeh |
| author_sort | M. Mokhtari |
| collection | DOAJ |
| description | In the past two decades, crack-tip mechanics has been increasingly studied with full-field
techniques. Within these techniques, Digital Image Correlation (DIC) has been most widely used due to its
many advantages, to extract important crack-tip information, including Stress Intensity Factor (SIF), Crack
Opening Displacement, J-integral, T-stress, closure level, plastic zone size, etc. However, little information is
given in the literature about the experimental setup that provides best estimations for the different parameters.
The current work aims at understanding how the experimental conditions used in DIC influence the crack-tip
information extracted experimentally. The influence of parameters such as magnification factor, size of the
images, position of the images with respect the crack-tip and size of the subset used in the correlation is studied.
The influence is studied in terms of SIF and T-stress by using Williams’ model. The concept of determination of
the K-dominance zone from experimental data has also explored. In this regard, cyclic loading on a fatigue
crack in a compact tension (CT) specimen, made of aluminium 2024-T351 alloy, has been applied and the
surface deformation ahead of the crack tip has been examined. The comparison between theoretical and
experimental values of KI showed that the effect of subset size on the measured KI is negligible compared to
the effect of size of the image. |
| format | Article |
| id | doaj-art-4f903a0f715d47799cfa6c08dd33f628 |
| institution | DOAJ |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2015-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-4f903a0f715d47799cfa6c08dd33f6282025-08-20T02:51:42ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932015-07-0193314315010.3221/IGF-ESIS.33.18Some experimental observations of crack-tip mechanics with displacement dataM. Mokhtari0P. Lopez-Crespo1B. Moreno2M. Zanganeh3University of Malaga,SpainUniversity of Malaga,SpainUniversity of Malaga,SpainORAU,USAIn the past two decades, crack-tip mechanics has been increasingly studied with full-field techniques. Within these techniques, Digital Image Correlation (DIC) has been most widely used due to its many advantages, to extract important crack-tip information, including Stress Intensity Factor (SIF), Crack Opening Displacement, J-integral, T-stress, closure level, plastic zone size, etc. However, little information is given in the literature about the experimental setup that provides best estimations for the different parameters. The current work aims at understanding how the experimental conditions used in DIC influence the crack-tip information extracted experimentally. The influence of parameters such as magnification factor, size of the images, position of the images with respect the crack-tip and size of the subset used in the correlation is studied. The influence is studied in terms of SIF and T-stress by using Williams’ model. The concept of determination of the K-dominance zone from experimental data has also explored. In this regard, cyclic loading on a fatigue crack in a compact tension (CT) specimen, made of aluminium 2024-T351 alloy, has been applied and the surface deformation ahead of the crack tip has been examined. The comparison between theoretical and experimental values of KI showed that the effect of subset size on the measured KI is negligible compared to the effect of size of the image.http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_18.pdfDigital image correlationStress intensity factorT-stressCrack tip displacement field |
| spellingShingle | M. Mokhtari P. Lopez-Crespo B. Moreno M. Zanganeh Some experimental observations of crack-tip mechanics with displacement data Fracture and Structural Integrity Digital image correlation Stress intensity factor T-stress Crack tip displacement field |
| title | Some experimental observations of crack-tip mechanics with displacement data |
| title_full | Some experimental observations of crack-tip mechanics with displacement data |
| title_fullStr | Some experimental observations of crack-tip mechanics with displacement data |
| title_full_unstemmed | Some experimental observations of crack-tip mechanics with displacement data |
| title_short | Some experimental observations of crack-tip mechanics with displacement data |
| title_sort | some experimental observations of crack tip mechanics with displacement data |
| topic | Digital image correlation Stress intensity factor T-stress Crack tip displacement field |
| url | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_18.pdf |
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