Process Obtimazation

Title: Development of a multifunctional panel for aerospace use through SLM additive manufacturing .

Authors and full affiliations: Michele Bicia, Salvatore Brischettob, Francesca Campanaa, Carlo Giovanni Ferrob, Carlo Seclìc, Sara Varettib,d, Paolo Maggioreb, Andrea Mazzab , aSapienza Università di Roma, Via Eudossiana 18, 00184 Roma; bPolitecnico Di Torino, Corso Duca degli Abruzzi 24, 10129 Torino ;cAltair Engineering, Via Livorno 60, 10144 Torino; d3D- New Technologies (3D-NT), via Livorno 60, 10144, Torino .

Keywords: DOE ; Metamodeling; Pareto optimality; Virtual prototyping; Response surface;

Purpose: The aim is to investigate an innovative solution for a multifunctional sandwich panel. Moreover ,a specific objective of this paper is to test different models of cells type and different skin thicknesses to understand which design variable affect mainly the mechanical behavior .

Methodology: To establish whether of the design variable affects majorly the mechanical resistance of the sandwich panel, a Design of Experiment (DOE) has been designed. DOE method has been applied through FEM simulations on a NACA profile, using real loads from aerodynamic simulations. FEM model considers the outer skins modelled as shells and the lattice core made by beams. So that, DOE design variables considered in the present work are: cell type, cell length, beam section radius, shell thickness. FEM geometry (cell type and length) was set-up through a MATLAB code designed for automatize the FEM pre-processing.

Findings: From the Pareto frontier of the problem, optimal solutions were evaluated. To optimize mass and 1st frequency beam radius can be set between 0.35 and 0.40 passing from cell_1 to cell_2_ in case of length_5, from 0.47 to 0.50 in case of length_7. Shell thickness, with the same type of progression, changed from 0.52 to 0.40. Benefits: The adopted DOE allowed to build a full quadratic response surface that was used to optimize mass and frequency, leaving the maximum stresses under a threshold safe for yielding.

Grafical Abastract: Layout of P180 anti-ice system

Full reference: Michele Bici, Salvatore Brischetto, Francesca Campana, Carlo Giovanni Ferro, Carlo Seclì, Sara Varetti, Paolo Maggiore, Andrea Mazza, Development of a multifunctional panel for aerospace use through SLM additive manufacturing, Procedia CIRP, Volume 67,2018, Pages 215-220.

Link: https://www.sciencedirect.com/science/article/pii/S2212827117311460