PSI - Issue 55

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

205

5

Table 3 – Mean value and standard deviation for the flexural modulus E f and the maximum stress S max obtained from the flexural tests of PMMA and PC specimens. Printing patterns E [MPa] S max [MPa] Mean Mean

Standard deviation

Standard deviation

0°

2104.6 1977.3 2033.6 2332.1 2229.6 2350.3

46.68 65.23 79.22 60.16 32.23 81.67

65.65 50.75 64.68 95.51 88.76

0.76

PMMA

90°

10.84

+/- 45°

0.59 0.87 6.76

0°

PC

90°

+/- 45°

95.1

0.8714

4. Conclusions The mechanical behaviours of AMed polycarbonate (PC) and Polymethyl methacrylate (PMMA) coupons were preliminarily investigated in this work. Dog-bone and rectangular specimens were printed by means of the FFF manufacturing technique by using three different printing setups and subsequently subjected to tensile and flexural mechanical tests. The stress vs. strain curves were obtained for the two considered materials, and the mean value and the standard deviation for the tensile and flexural mechanical properties were calculated. It was found out that, in general, the specimens obtained with the 90° printing setup were less resistant and characterised by a slightly higher variability in the mechanical properties. However, the obtained results are repeatable and therefore they witness the reliability of the printing process. Future investigations could deal with the comparison of results with those obtained testing the traditional moulded materials even under fatigue loadings. References Alfieri, V., Giannella, V.,Caiazzo, F., Sepe, R., 2022. Influence of position and building orientation on the static properties of LPBF specimens in 17-4 PH stainless steel. Forces Mech. 8. Elsevier B.V. ASTM D790, 2017. Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials. ASTM E8, 2021. Standard Test Methods for Tension Testing of Metallic Materials. Cole, D.P.,Gardea, F.,Henry, T.C.,Seppala, J.E.,Garboczi, E.J.,Migler, K.D.,Shumeyko, C.M.,, 2020. AMB2018-03: Benchmark Physical Property Measurements for Material Extrusion Additive Manufacturing of Polycarbonate. Integr. Mater. Manuf. Innov. 9(4), 358 – 375. Springer Science and Business Media Deutschland GmbH. Gardner, L., 2023. Metal additive manufacturing in structural engineering – review, advances, opportunities and outlook. Structures 47(December 2022), 2178 – 2193. Elsevier Ltd. Gopal, M.,Lemu, H.G., Gutema, E.M., 2023. Sustainable Additive Manufacturing and Environmental Implications: Literature Review. Sustain. 15(1), 1 – 23. Paolini, A.,Kollmannsberger, S., Rank, E., 2019. Additive manufacturing in construction: A review on processes, applications, and digital planning methods. Addit. Manuf. 30. Petersmann, S.,Hentschel, L.,Gonzalez-Gutierrez, J.,Tödtling, M.,Schäfer, U.,Arbeiter, F., Üçal, M., 2023. The Effects of Washing and Formaldehyde Sterilization on the Mechanical Performance of Poly(methyl Methacrylate) (PMMA) Parts Produced by Material Extrusion-Based Additive Manufacturing or Material Jetting. Adv. Eng. Mater. 25(7), 2200225. John Wiley & Sons, Ltd. Petersmann, S.,Spoerk, M.,Steene, W. Van De,Üçal, M.,Wiener, J.,Pinter, G., Arbeiter, F., 2020. Mechanical properties of polymeric implant materials produced by extrusion-based additive manufacturing. J. Mech. Behav. Biomed. Mater. 104(August 2019), 103611. Elsevier Ltd. Reich, M.J.,Woern, A.L.,Tanikella, N.G., Pearce, J.M., 2019. Mechanical Properties and Applications of Recycled Polycarbonate Particle Material Extrusion-Based Additive Manufacturing. Mater. 2019, Vol. 12, Page 1642 12(10), 1642. Multidisciplinary Digital Publishing Institute. Sepe, R.,Luca, A. De,Giannella, V.,Borrelli, R.,Franchitti, S.,Caprio, F. Di, Caputo, F., 2022. Influence of dimension, building position, and orientation on mechanical properties of EBM lattice Ti6Al4V trusses. Int. J. Adv. Manuf. Technol. 122(7 – 8), 3183 – 3198. Springer Science and Business Media Deutschland GmbH.