PSI - Issue 56

Balichakra Mallikarjuna et al. / Procedia Structural Integrity 56 (2024) 160–166 Author name / Structural Integrity Procedia 00 (2023) 000 – 000

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2. Methodology 2.1 Equipment and Materials

The FDM technique (3D Cubic CUB 3.5, India) was used to build the PETG samples and prototype. The process parameters used to prepare samples are shown in Table 1. PETG is a thermoplastic polyester used as a filament for printing samples. The filament spool is white transparent, and the diameter of the wire is 1.75 mm. The melting temperature of PETG is 230 – 250 ºC. The PETG filament was procured from e-commerce.

Table 1 Process parameters used for printing Sample Designation Infill Density (%)

Print Temperature (℃)

Print Speed (mm/sec)

S1 S2 S3 S4 S5 S6 S7 S8 S9

20 20 20 25 25 25 30 30 30

225 235 245 225 235 245 225 235 245

20 25 30 25 30 20 30 20 25

2.2 Testing and characterization The tensile test samples were prepared according to the ASTM 'D638' standard. This test method uses dumbbell shaped specimens with 25 mm or 50 mm gauge lengths. The FDM-printed PETG samples' tensile test was carried out using a Uniaxial Tensile Test machine (H25KT, Tinus Olsen, 2007). The FDM-printed tensile samples are shown in Fig. 1 (a). The compression test was fabricated following the ASTM 'D695' standard, as shown in Figure 1 (b).

(c)

(a)

(b)

(d)

Fig. 1. FDM Printed samples of (a) tensile specimen; (b) compression specimen; (c) flexural specimen; (d) impact specimens.