Laser Powder Bed Fusion (L-PBF) provides ample freedom to fabricate lattice materials with tailored micro- architecture. Nevertheless, small-scale structures often suffer from a wide range of morphological defects, which impact the macro-scale mechanical properties. In this work, prominent morphological factors including geo- metric irregularities (surface notches and cross-section deviation), node geometry and printing direction are assessed for four batches of L-PBF Ti-6Al-4 V cubic lattice specimens, and their fatigue behavior compared. The results show that smoothing the strut fillets at their node remarkably improves the S-N curves and that the printing direction impacts both the fatigue strength and the failure behavior.

The role of node fillet, unit-cell size and strut orientation on the fatigue strength of Ti-6Al-4V lattice materials additively manufactured via laser powder bed fusion / Dallago, M.; Raghavendra, S.; Luchin, V.; Zappini, G.; Pasini, D.; Benedetti, M.. - In: INTERNATIONAL JOURNAL OF FATIGUE. - ISSN 0142-1123. - STAMPA. - 142:(2021), p. 105946. [10.1016/j.ijfatigue.2020.105946]

The role of node fillet, unit-cell size and strut orientation on the fatigue strength of Ti-6Al-4V lattice materials additively manufactured via laser powder bed fusion

Dallago, M.;Raghavendra, S.;Luchin, V.;Benedetti, M.
2021-01-01

Abstract

Laser Powder Bed Fusion (L-PBF) provides ample freedom to fabricate lattice materials with tailored micro- architecture. Nevertheless, small-scale structures often suffer from a wide range of morphological defects, which impact the macro-scale mechanical properties. In this work, prominent morphological factors including geo- metric irregularities (surface notches and cross-section deviation), node geometry and printing direction are assessed for four batches of L-PBF Ti-6Al-4 V cubic lattice specimens, and their fatigue behavior compared. The results show that smoothing the strut fillets at their node remarkably improves the S-N curves and that the printing direction impacts both the fatigue strength and the failure behavior.
2021
Dallago, M.; Raghavendra, S.; Luchin, V.; Zappini, G.; Pasini, D.; Benedetti, M.
The role of node fillet, unit-cell size and strut orientation on the fatigue strength of Ti-6Al-4V lattice materials additively manufactured via laser powder bed fusion / Dallago, M.; Raghavendra, S.; Luchin, V.; Zappini, G.; Pasini, D.; Benedetti, M.. - In: INTERNATIONAL JOURNAL OF FATIGUE. - ISSN 0142-1123. - STAMPA. - 142:(2021), p. 105946. [10.1016/j.ijfatigue.2020.105946]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/275156
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