PSI - Issue 53

C.T. Duarte et al. / Procedia Structural Integrity 53 (2024) 299–308 Author name / Structural Integrity Procedia 00 (2019) 000–000

301

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2. Materials and methods 2.1 Materials Two thermoplastic filaments, PLA and ABS, were commercially acquired from GTMax 3D (Americana, SP, Brazil). The basic mechanical properties as provided by the supplier can be seen in Table 1. 2.2 Specimen manufacture Sandwich-structured tests specimens were manufactured using an Ender 3 3D printer (Creality 3D, China). In addition to the mono-material samples, three sandwich configurations were fabricated for both unaged and aged cases (Fig. 1):

 A5P5A5: 5 layers of ABS – 5 layers of PLA – 5 layers of ABS  A3P9A3: 3 layers of ABS – 9 layers of PLA – 3 layers of ABS  A1P13A1: 1 layer of ABS – 13 layers of PLA – 1 layer of ABS

The slicing of the 3D model was carried out using the Cura software (version 4.12.1). Printing parameters were selected based on literature (Cavalcanti, D., Banea, M., and Queiroz, H. d. 2020) and filament supplier recommendations, as summarized in Table 2. All test specimens were printed individually in the flat-edge orientation. The specimen dimensions (in mm) can be seen in Fig. 2.

Fig. 1. Scheme of sandwich-structured samples configurations and nomenclature.

Table 2. Printing parameters. Parameters

Value

Infill

PLA Line

ABS Line

Pattern

Angle (º)

0

0

Density (%) Speed Travel (mm/s) Printing (mm/s)

100

100

100

100

45 25

45 25

First layer printing (mm/s)

Quality layer height (mm) Number of counters

0.2

0.2

3

3

Temperature Build plate (ºC)

105 210

105 210

Nozzle (ºC)