Near tip strain evolution of a growing fatigue crack
Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic loading. An error analysis of displacements and strains has been carried out, and...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2015-07-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_9.pdf |
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| Summary: | Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image
Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic
loading. An error analysis of displacements and strains has been carried out, and the results show that the
precision of displacements and strains in the wake of the crack is worse than that in front of the crack. A
method for the determination of crack tip location is proposed for the DIC analysis. Strain ratchetting is
observed ahead of the growing fatigue crack tip and found to be dependent on the distance to the crack tip;
whilst normal strains appear to stabilise behind the crack tip. |
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| ISSN: | 1971-8993 1971-8993 |