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Fatigue crack propagation in Ti-6Al-4V subjected to high strain amplitudes

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Author

Summary, in English

Fatigue crack propagation in circular Ti-6Al-4V specimens subjected to high strain amplitudes has been investigated. Crack closure was measured with an electrical potential-drop technique. Closure was shown not to depend on strain ratio but to be a function of the applied strain range. At higher strain ranges, the crack was found to be closed for a smaller part of the load cycle than at lower strain ranges due to blunting of the crack tip. Furthermore, the use of a strain-intensity approach to predict crack-propagation rate was investigated, and it was found that for the upper parts of the da/dN curves the effective strain intensity yields good predictions. Also, the effective stress-intensity factor was found to collapse the da/dN curves for different load ratios.

Publishing year

2005

Language

English

Pages

301-308

Publication/Series

Fatigue & Fracture of Engineering Materials & Structures

Volume

28

Issue

3

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Applied Mechanics
  • Materials Engineering

Keywords

  • crack propagation
  • fatigue
  • crack closure
  • strain-intensity factor

Status

Published

ISBN/ISSN/Other

  • ISSN: 1460-2695