PSI - Issue 28

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 il l li t . i i t. tr t r l I t rit r i ( )

www.elsevier.com/locate/procedia . l i r. /l t / r i

ScienceDirect

Procedia Structural Integrity 28 (2020) 517–524

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo In this current study, titanium alloy Ti6Al4V cellular structures with four different geometries (Cubic, Star-shaped, X-shaped and Trabecular) manufactured using LPBF are considered. The mechanical performances of the samples, designed in order to have an overall porosity of 70-75%, have been evaluated with static tests under tensile and compressive loading, and with compression-compression fatigue test (R=0.1). The results indicate a clear decrease in the mechanical properties with increase in the bending dominated behavior of the cell types. However, Cubic structures displayed a catastrophic fracture behaviour, while the other structures were more resilient. Furthermore, despite the facts being bending dominated and with the lowest number of struts per node, the Trabecular structures showed good fatigue resistance thanks to the presence of struts in all the directions. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Selective laser melting; Titanium alloy; Strength;Fatigue , tit i ll i l ll l t t it i t t i i , t , l t i i . i l t l , i i t ll it , l t it t ti t t t il i l i , it i i ti t t . . lt i i t l i t i l ti it i i t i i t i t ll t . , i t t i l t t i t i , il t t t t ili t. t , it t t i i i t it t l t t t , t l t t ti i t t t t t t i ll t i ti . t . li . . This is an open access article under the CC BY-NC li tt :// ti . /li / / . i i ilit t t t l t it i t : l ti l r lti ; it i ll ; tr t ; ti 1st Virtual European Conference on Fracture Evaluation of Static and Fatigue Properties of Regular Lattice and Trabecular Cellular Structures S.Raghavendra a *, A.Molinari a , V.Fontanari a , G.Zappini b , M.Benedetti a , a Department of Industrial Engineering,University of Trento,Trento 38123,Italy b Lincotek Medical, Pergine Valsugana, Trento 38057, Italy Abstract Laser-based Powder Based Fusion (LPBF) being one of the most widely used additive manufacturing (AM) process has not only impacted the design of components in aeronautical and automobile industries but also in development of porous components. The properties of these lattice structures can be tailored according to the structural and compatibility requirements depending on the application. Therefore, understanding the behavior of cellular structures under static and fatigue loading becomes necessary. The factors that influence their behavior include relative density, cell topology, cell geometry and microstructure of the material. S.Raghavendra a *, A.Molinari ppin b t a a t t f I t i l i i , i it f t , t ,It l b i t i l, i l , t , It l i i t t i l iti t i t l i t t i t i ti l t il i t i t l i l t t . ti t l tti t t t il i t t t t l ti ilit i t i t li ti . , t i t i ll l t t t ti ti l i . t t t i l t i i i l l ti it , ll t l , ll t i t t t t i l. t i t t

* Corresponding author. Tel.: +39-348-381-7779; fax: +0-000-000-0000 . E-mail address: sunil.raghavendra@unitn.it i t r. l.: - - - ; f : - - - . il il. it .it rr

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2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo i i rti l r t - - li ( tt :// r ti . r /li / - - / . ) r-r i r r i ilit f t r tr t r l I t rit i t ( I )

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.061