PSI - Issue 42

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

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ScienceDirect

Procedia Structural Integrity 42 (2022) 1449–1457

© 2022 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 scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The present paper investigates the influence of AM defects on the energy absorption capability of lattice structure specimens made of carbon nylon. Two typologies of defects are considered through numerical simulations: i) the variation of the diameter of the beam with respect to the nominal value; ii) the presence of lack-of-fusion portions of material within the beams. The defects are randomly disposed in the unit cell and different defect populations are then simulated. Transient nonlinear finite element analyses of the lattice structure subjected to compression tests are performed in the LS-Dyna environment. The numerical model is validated with experimental data collected in a previously published work. Results show that both beam diameter variations and lack-of-fusion defects affect the absorbed energy although with different severities. The increasing degradation of the absorbed energy with the increasing numerosity of the defects confirms the necessity of accounting for these defects when designing lattice based energy absorbers. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Additive Manufacturing, Lattice Structure, Energy Absorption t i ti t t i l t t ti ilit l tti t t i l . t l i t i t i l i l ti : i t i ti t i t t it t t t i l l ; ii t l i ti t i l it i t . t l i i t it ll i t t l ti t i l t . i t li i it l t l t l tti t t j t t i t t i t i t. i l l i li t it i t l t ll t i i l li . lt t t t i t i ti l i t t t lt it i t iti . i i ti t it t i i it t t i t it ti t t i i l tti . t . li l i . . This is an ope ti l t li tt :// ti . /li / / . / i i ilit t : iti f t ri , tti tr t r , r r ti 23 European Conference on Fracture - ECF23 On the influence of Additive Manufacturing defects on the energy absorption capability of a lattice structure C. Boursier Niutta a *, R. Ciardiello a , F. Berto b , D.S. Paolino a , A. Tridello a a Department of Mechanical and Aerospace Engineering, Politecnico di Torino b Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology ard a b o a a a t t f i l i i , lit i i i b t t f i l I t i l i i , i i it f i l

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Nomenclature AM iti

Additive Manufacturing t i

* Corresponding author. E-mail address: carlo.boursier@polito.it i t r. - il : rl . r i r lit .it rr

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li

2452-3216 © 2022 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 scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.185