PSI - Issue 28

Fatima Majid et al. / Procedia Structural Integrity 28 (2020) 1719–1726 Author name / Structural Integrity Procedia 00 (2019) 000–000

1721

3

The setting up of the 3D printer machine are shown in the table 1 and fig.1.

Table 1. Controlled printing parameters. Infill density (%)

100,60,40,20

Feed rate (mm/s)

20 mm/s

Layer thickness (mm) Extruder temperature (°C)

0.2

250

Bed temperature (°C)

80

Raster angles

1.2

Second, the machine builds the model layer by layer. The layer thickness dictates the final quality and depends on the machine and process. For Fused Deposition Modelling a layer thickness of 0.254 mm is typical, for Stereolithography printing can result in a quality of 0.05 – 0.1 mm. The size of a model depends on the machine size. During printing, the used material take the form of filaments, which are unwound from a coil and fed through an extrusion nozzle. The nozzle melts the filaments and extrudes them onto a build sample. The samples for tensile testing were produced in accordance with BS EN ISO 527-2:2012. The dimensions of the samples are shown in the fig.2.

(a)

(b)

Fig. 1.(a) 3D printer; (b) Manufacturing parameters;