Page 58 - MSAM-1-3

Materials Science in Additive Manufacturing Characterization of TPMS structures

A F

B G

C H

D I

E J

Figure 7. The variations between the real pore size and design geometric parameters of the Schwarz-P structure. (A-E) show the top views of samples B0,
B0.2, B0.4, B0.6, and B0.8, respectively. (F-J) show the top views of samples A0.4, B0.4, C0.4, D0.4, and E0.4, respectively.

is because some semi-melted powder became attached to
the surface. However, when we calculated the theoretical
relative density, we used the width of the polished samples,
neglecting the attached powder. Moreover, on comparing
the theoretical relative densities of samples A0, B0, C0,
D0, and E0 (or other samples with the same shape factor
but different unit sizes), it was found that when the shape
factor remained constant, the theoretical relative density
of the Schwarz structure decreased rapidly with increasing
unit size. On comparing the theoretical relative densities of
samples A0, A0.2, A0.4, A0.6, and A0.8 (or other samples
Figure 8. Comparing results of the theoretical and the measured relative with the same unit size and different shape factors), when
density. the unit size remained constant, the theoretical relative
density decreased with increasing shape factor; however,
A0.6, and A0.8 had some closed cavities filled with unmelted the change was very small and almost negligible.
powder particles, which is why the measured relative Therefore, we considered that the measured
densities of these samples were much greater than the relative density did not reflect the actual densification
theoretically calculated results. In addition, the measured of the Schwarz-P structures because the partially
results were slightly greater than the theoretical results. This melted and unmelted powder particles attached to the

Volume 1 Issue 3 (2022) 7 http://doi.org/10.18063/msam.v1i3.17