PSI - Issue 53

ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 53 (2024) 227–235

© 2023 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 ESIAM23 chairpersons Abstract Because of its unique geometry, lattice structures exhibit high strength, stiffness, and low weight with good mechanical efficiency. These structures are the best option for creating parts in the aviation and automotive industries because they allow for high levels of safety without significantly increasing weight, which affects fuel consumption and pollutant gas emissions. Many methods can be used to create these structures, but additive manufacturing is the most promising. The most commonly employed methods are selective laser melting (SLM) and electron beam melting (EBM). In the former, a laser beam melts the powder, whereas, in the latter, an electron beam performs this function. In previous work, a mismatch between theoretical and actual bending properties was found and partially attributed to geometrical unconformities; in fact, the produced specimens were lighter than expected, denoting a thinning of the trusses and skins due to the process. However, only a part of the deviation from the experimental results was compensated by reducing the diameter of the trusses and the thickness of the skins. Therefore, in this work, sandwich structures with lattice cores were produced through EBM process, and local mechanical characteristics were investigated to bridge the left gap. In particular, attention was paid to effective material properties, that, for thin trusses, differ from those of thicker elements. © 2023 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 ESIAM23 chairpersons Keywords: Numerical model; local yield strength; hardness test; EBM. Third European Conference on the Structural Integrity of Additively Manufactures Materials (ESIAM23) Additive process effect on the characteristics of lattice structures made through EBM Costanzo Bellini a *, Rosario Borrelli b , Vittorio Di Cocco a , Stefania Franchitti b , Francesco Iacoviello a , Larisa Patricia Mocanu a and Luca Sorrentino a a Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, Italy b Manufacturing Processes on Metallic Materials LAB, CIRA, Capua, Italy Abstract Because of its unique geometry, lattice structures exhibit high strength, stiffness, and low weight with good mechanical efficiency. These structures are the best option for creating parts in the aviation and automotive industries because they allow for high levels of safety without significantly increasing weight, which affects fuel consumption and pollutant gas emissions. Many methods can be used to create these structures, but additive manufacturing is the most promising. The most commonly employed methods are selective laser melting (SLM) and electron beam melting (EBM). In the former, a laser beam melts the powder, whereas, in the latter, an electron beam performs this function. In previous work, a mismatch between theoretical and actual bending properties was found and partially attributed to geometrical unconformities; in fact, the produced specimens were lighter than expected, denoting a thinning of the trusses and skins due to the process. However, only a part of the deviation from the experimental results was compensated by reducing the diameter of the trusses and the thickness of the skins. Therefore, in this work, sandwich structures with lattice cores were produced through EBM process, and local mechanical characteristics were investigated to bridge the left gap. In particular, attention was paid to effective material properties, that, for thin trusses, differ from those of thicker elements. © 2023 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 ESIAM23 chairpersons Keywords: Numerical model; local yield strength; hardness test; EBM. Third European Conference on the Structural Integrity of Additively Manufactures Materials (ESIAM23) Additive process effect on the characteristics of lattice structures made through EBM Costanzo Bellini a *, Rosario Borrelli b , Vittorio Di Cocco a , Stefania Franchitti b , Francesco Iacoviello a , Larisa Patricia Mocanu a and Luca Sorrentino a a Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, Italy b Manufacturing Processes on Metallic Materials LAB, CIRA, Capua, Italy

* Corresponding author: Costanzo Bellini. Tel.: +39 0776 299 3617. E-mail address: costanzo.bellini@unicas.it * Corresponding author: Costanzo Bellini. Tel.: +39 0776 299 3617. E-mail address: costanzo.bellini@unicas.it

2452-3216 © 2023 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 ESIAM23 chairpersons 2452-3216 © 2023 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 ESIAM23 chairpersons

2452-3216 © 2023 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 ESIAM23 chairpersons 10.1016/j.prostr.2024.01.028

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