Page 46 - eBook_Proceedings of the International Conference on Digital Manufacturing V2

Proceedings of the International Conference on Digital Manufacturing –
Volume 2

METHODOLOGY

Beam Design and Lattice Generation
A beam with 70% porous core is designed. The PLA infill
structures were generated using N-Topology software. The shell
thickness of the beam was taken as 2.5% of the smallest side of
the beam, as in Figure 12.

Figure 11 shows the selected lattice structures: BCC, FCC,
Kelvin, Octet, Hexagonal Honeycomb (HX HC), Triangular
Honeycomb (TRI HC), Fluorite, Diamond, and Gyroid. In order
to ensure consistency and diminish the effect of any other
parameter, the unit cell size was kept at 15 × 15 ×
15 and total PLA infill volume was held constant at 0.0496
kg. Modulus of Elasticity of PLA = 2.939 , =
1244 / 3 while Poisson’s ratio = 0.3 This was achieved
by varying the unit cell thickness for each configuration until the
required volume was attained.

Thickness of the skin
is 2.5% of the Height

Figure 11: Gyroid Infill Beam (Dimensions: 200 x 35 x 19 mm)
with skin thickness of 0.48mm generated using nTopology.

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