PSI - Issue 51

J. Majko et al. / Procedia Structural Integrity 51 (2023) 160–165 J. Majko et al. / Structural Integrity Procedia 00 (2022) 000–000

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2.3. Specimens The experimental measurement was carried out on specimens with a shape (Fig. 1) according to the standard ASTM D638-14 (ASTM International, (2014)). The specimen's thickness was 3 millimetres, which falls within the tolerance defined by the standard.

Fig. 1. Specimen shape.

The specimens of the mentioned shape were designed in a CAD program and subsequently imported into slicing software. The slicing software allows for the adjustment of printing parameters (Table 2). The printing parameters described in Table 2 were the same for both series of specimens.

Table 2. Printing parameters. Parameter

Value

Layer thickness [mm] Base plane of specimen

0.1 XY

Matrix filament orientation in lamina [degrees]

0

Number of walls Fill density [%]

15

100

Infill type

Solid fill

Number of floor and roof layers

2

Number of laminas

30

Each printed specimen consisted of thirty 0.1 millimetres thick laminas. The infill type was solid fill with an infill density of 100%. The orientation of the material was 0° to the loading direction, which was achieved using walls around the specimen circumference (Fig. 2).

Fig. 2. Deposition of the material in lamina. White lines represent deposited filament. Cyan-colored arrows indicate walls around the specimen circumference.

In the case of wet nylon, when the nozzle temperature is increased to the melting point, uncontrolled material flow through the nozzle occurs (Fig. 3). This fact negatively affects print quality not only in terms of visuals but also its functionality. Material is deposited in unwanted places, which results in the occurrence of print inaccuracies and the