PSI - Issue 55

America Califano et al. / Procedia Structural Integrity 55 (2024) 201–205 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 1. Main dimensions (in mm) of the printed dog-bone and rectangular specimens

Fig. 2. (a) Specimens printed at each printing cycle and their position on the printing plate; (b) printing patterns for each printing cycle.

3. Results and Discussion Results were compared among specimens of the same AMed material but characterized by different printing patterns in such a way to highlight the influence of the printing patterns on the mechanical properties. Figures 3 shows some of the tensile stress/strain curves for (a) three PMMA and (b) PC dog-bone specimens, whereas Figure 4 shows the flexural stress-strain curves for the three rectangular specimens. In general, it can be noticed that, both for tensile and flexural behaviours, the elastic moduli and the strengths are almost completely independent from the printing pattern, for both materials. However, the biggest difference can be noticed in the maximum strain to failure. As a matter of fact, in almost all cases the specimens with the 90° printing pattern failed earlier than the other ones. Tables 2 and 3 report the mean values and the standard deviations for the elastic moduli E and the maximum stress S max , for the tensile and the flexural tests, respectively.