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- Title
Local strain accumulation in fatigue crack propagation process of Ti-6Al-4V alloy.
- Authors
Ye, S.; Gong, J. ‐G.; Tu, S. ‐T.; Zhang, X. ‐C.; Zhang, C. ‐C.
- Abstract
Fatigue crack growth behaviours of the titanium alloy Ti-6Al-4V, with two different microstructures, at different maximum stresses were identified by digital image correlation technique. Full-field strains were monitored around fatigue cracks after consecutive cycles in fatigue crack growth experiments. Results indicated that the Ti-6Al-4V alloy with a bi-modal microstructure had a better fatigue resistance than that with a primary-α microstructure. Typical behaviours of small cracks and the evolution of multi-scale fatigue cracks were clarified. The strain accumulations around the micro-notch and fatigue crack increased with increasing number of load cycles. On the basis of von Mises strain mapping, it was found that crack growth rate could be characterized by crack-tip plastic zone size .
- Subjects
FATIGUE crack growth; DIGITAL image correlation; TITANIUM alloys; FRACTURE mechanics; FATIGUE cracks
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2017, Vol 40, Issue 5, p836
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12559