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 latticebased energy absorbers

On the influence of Additive Manufacturing defects on the energy absorption capability of a lattice structure / Boursier Niutta, C.; Ciardiello, R.; Berto, F.; Paolino, D. S.; Tridello, A.. - 42:(2022), pp. 1449-1457. (Intervento presentato al convegno ECF23, European Conference on Fracture 2022 tenutosi a Funchal, Madeira (Portugal) nel June 27 – July 1, 2022) [10.1016/j.prostr.2022.12.185].

On the influence of Additive Manufacturing defects on the energy absorption capability of a lattice structure

Boursier Niutta C.;Ciardiello R.;Paolino D. S.;Tridello A.
2022

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 latticebased energy absorbers
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2979195