4.7 Article

Fatigue crack growth for through and part-through cracks in additively manufactured Ti6Al4V

Journal

INTERNATIONAL JOURNAL OF FATIGUE
Volume 155, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106608

Keywords

Additive manufacturing; Ti6Al4V; Fatigue crack growth; Damage tolerance; Aerospace

Funding

  1. Swedish Foundation for Strategic Research [14-0060]
  2. Clean Sky 2 joint undertaking under the European Union's Horizon 2020 research and innovation programme
  3. Saab AB

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This study compares the fatigue crack growth rates for different crack configurations and finds that the data obtained with CT-specimens are relevant for general damage tolerance predictions.
Critical aerospace parts require damage tolerance analysis to determine the inspection intervals in-service. Such analyses, based on linear fracture mechanics, require that the fatigue crack growth (FCG) rate relation to the stress intensity factor range is applicable independent of geometry and stress. FCG rates for laser powder bed fusion Ti6Al4V material for conventional compact tension (CT) specimens have therefore been compared to FCG rates for specimens with a crack configuration more technically relevant from an industrial and engineering perspective. The FCG rates corresponded very well and data obtained with CT-specimens can therefore be considered relevant for general damage tolerance predictions.

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