PSI - Issue 47

G. Morettini et al. / Procedia Structural Integrity 47 (2023) 296–309 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 4. ASED method combined with EMC workflow.

3. Experimental data and mechanical fictitious material characteristics In this chapter, the procedures for testing both smooth and notched specimens are illustrated. Starting from their fabrication up to the results in terms of resistance strength of the various sets of notched specimens. 3.1. Material: specimen fabrication The fabrication of the specimens followed, where possible, the standard ASTM D638 (International ASTM (2015)) both for the fabrication of simple and notched specimens. All specimens were made using an Ultimaker 3 extended FDM printer with a 0.4 mm hot-end nozzle, using a 2.85 mm diameter Ultimaker green PLA filament. The correct selection of process parameters is crucial for successful printing, especially when optimizing strength and load capacity. For this reason, all specimens were printed using the optimized parametric setting determined by the authors in a previous research work (Rossi at al. (2022), Palmieri at al. (2022)) and positioned horizontally, in order to optimize the mechanical properties of the printed elements. The main parameters are summarized in Table 1.

Table 1. Principal Printed parameters used for all the specimens fabricated. PAREMETRS VALUES Layer height 0.2 mm Wall line Count 4 Wall thickness 1.2 mm Top/Bottom thickness 1.2 mm Infill density 100% Infill pattern Line Infill line directions [-45,+45] Printing temperature 215°C Build plate temperature 60°C Print speed 35 mm/s