Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 138, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105702
Keywords
Additive manufacturing; Bone tissue scaffold; Fatigue behaviour; Gyroid cellular structures; Surface roughness
Funding
- Spanish Ministry of Economy and Competitiveness, Spain [DPI2015-71073-R]
- University of Las Palmas de Gran Canaria, Spain
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Surface roughness effects on the fatigue behaviour of gyroid cellular Ti-6Al-4 V structures obtained by additive manufacturing were investigated. The normalized fatigue strength values for 10<^>6 cycles, obtained from the S-N curves, were in the range of 0.21-0.23. Finite element analyses showed that stress peak points were located on the stress concentrators due to surface defects, and scanning electron microscopy images showed that crack initiation was located at the surface. It is concluded that the expected good fatigue behaviour due to the curvature in the junctions of the struts, is diminished because of the superficial roughness contributing to the notch effect.
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