PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 37 (2022) 755–762

© 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 Pedro Miguel Guimaraes Pires Moreira Abstract Due to the 3D printing techniques, it is possible to create and design components with soft and rigid combinations of materials with different elastic properties which may satisfy multiple material requirements. A soft (blue) and a rigid (purple) material with moduli of elasticity in a ratio 1:10 can be innkjet printed together following an initial pattern. The objective function was formulated as to maximize the effective stiffness on both in-plane directions. Finite element analyses were performed by using the PyAnsys software under an MIT License in a domain with 16 Q8 elements which represents by symmetry a representative volume element (RVE). The objective function to be maximized can also reduce the anisotropy of the printed topology. We proved that the formulation of three objective functions affects the results obtained with a Greedy algorithm. © 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) ICSI 2021 The 4th International Conference on Structural Integrity Stiffness Optimization Through a Modified Greedy Algorithm Iulian Constantin Coro pețchi a,b , Alexandru Vasile a,b , Ș tefan Sorohan b , Cătălin Radu Picu b,c , Dan Mihai Constantinescu b, * a Military Technical Academy „Ferdinand I”, Bulevardul George Coşbuc nr. 39 -49, 050141, Bucharest, Romania b University POLITEHNICA of Bucharest, Splaiul Independeţei nr. 313, 060042 Buchare st, Romania, dan.constantinescu@upb.ro c. Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY, USA 12180 Abstract Due to the 3D printing techniques, it is possible to create and design components with soft and rigid combinations of materials with different lastic properties which may satisfy multipl material requirements. A soft (blue) an a rig d (purple) aterial moduli of elasticity in a ratio 1:10 can be innkjet printed together following a initial pat ern. The objective function was fo mulated as to maximize the effective stiffness on both in-plane dir ctions. Finite element analyses wer performed by using the PyAnsys software under an MIT L c n e i a d main with 16 Q8 el ment which r presents by symm try a epresentative volume element (RVE). The objective function to be ximized can also r duce the anisotropy of the printed to ology. W proved that the formulation of three objective functions ffects the result btained with a Greedy algorithm. © 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 Pedro Miguel Guimara s Pires Moreira Keywords: optimization; Greedy algorithm; PyAnsys; composite microstructure 1. Introduction The current evolution of 3D printing technology allows us to create composite materials with soft and rigid combinations hat have different elastic properties. In this ay we can d sign and create new materials th t behave like natural composite materials. ICSI 2021 The 4th International Conference on Structural Integrity Stiffness Optimization Through a Modified Greedy Algorithm Iulian Constantin Coro pețchi a,b , Alexandru Vasile a,b , Ș tefan Sorohan b , Cătălin Radu Picu b,c , Dan Mihai Constantinescu b, * a Military Technical Academy „Ferdinand I”, Bulevardul George Coşbuc nr. 39 -49, 050141, Bucharest, Romania b University POLITEHNICA of Bucharest, Splaiul Independeţei nr. 313, 060042 Buchare st, Romania, dan.constantinescu@upb.ro c. Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY, USA 12180 Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: optimization; Greedy algorithm; PyAnsys; composite microstructure 1. Introduction The current evolution of 3D printing technology allows us to create composite materials with soft and rigid combinations that have different elastic properties. In this way we can design and create new materials that behave like natural composite materials.

* Corresponding author. E-mail address: dan.constantinescu@upb.ro * Corresponding author. E-mail address: dan.constantinescu@upb.ro

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 Pedro Miguel Guimaraes Pires Moreira 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 Pedro Miguel Guimaraes Pires Moreira

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.006