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Fatigue prediction of additive manufactured Ti-6Al-4V for aerospace: Effect of defects, surface roughness

 
: Greitemeier, D.; Holzinger, V.; Donne, C.D.; Eufinger, J.; Melz, T.

Siljander, A. ; International Committee on Aeronautical Fatigue and Structural Integrity -ICAF-:
ICAF 2015 structural integrity. Embracing the future - respecting the past, supporting aging fleets with new technologies : proceedings of the 34th conference and 28th symposium of the International Committee on Aeronautical Fatigue and Structural Integrity, 1 - 5 June 2015, Helsinki, Finland
Espoo: VTT Technical Research Centre of Finland Ltd., 2015
ISBN: 978-951-38-7442-1
S.12-20 (Vol.1)
International Committee on Aeronautical Fatigue and Structural Integrity (ICAF Conference) <34, 2015, Helsinki>
International Committee on Aeronautical Fatigue and Structural Integrity (ICAF Symposium) <28, 2015, Helsinki>
Englisch
Konferenzbeitrag
Fraunhofer LBF ()

Abstract
Ti-6Al-4V is the most common used titanium alloy in aerospace. Additive manufacturing (AM) allows to build these Ti-6Al-4V parts, rapidly and directly from computer-aided design information, with better material utilisation and reduced lead time, compared to wrought or cast material. However the understanding of reliability in terms of mechanical properties is still at an early stage. Therefore, this study should give first insights on fatigue properties of direct metal laser sintered (DMLS) material, with special focus on defects and surface roughness influences. Fracture mechanical approaches are used to estimate the influence of defects based on data obtained from computer tomography (CT) scans, as well as the influence of process inherent surface roughness by the use of an equivalent initial flaw size concept. It is shown, that the prediction is conservative for defects, while the estimated results of rough surfaces is in good agreement with the experimental determined values.

: http://publica.fraunhofer.de/dokumente/N-578507.html