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Materials Science in Additive Manufacturing Impact resistance and porous structures

A

B

C

D

Figure 12. The impact-damaged surface of graded triply periodic minimal surface (TPMS) sandwich structures: impact on the front (A) and back
(B) surfaces at 7 m/s; impact on the front (C) and back (D) surfaces at 10 m/s

A B

Figure 13. The impact properties of graded triply periodic minimal surface (TPMS) sandwich structures (n = 3): (A) v = 7 m/s, (B) v = 10 m/s
subjected to the maximum impact force. As the impact cell sizes has a gentle rise and fall in absolute acceleration
weakens, the acceleration decreases, and the structure values, indicating a greater ability to mitigate impacts.
enters the recovery phase. When the impact velocity is As shown in Figure 15B, when the impact velocity was
7 m/s, the acceleration of the uniform TPMS sandwich increased to 10 m/s, the acceleration-time curves of TPMS
structure decreases as the cell size increases, indicating sandwich structures with different cell sizes displayed
that small cells (i.e., G-E2) can withstand a larger impact. similar trends, but the acceleration fluctuated in the rising
However, uniform TPMS sandwich structures with smaller and falling stages. The fluctuations are due to the plastic
cell sizes have a rapid rise and fall in absolute acceleration deformation or compression collapse within the TPMS
values, and the rapid impact response indicates greater sandwich structure, causing changes in the external force
rigidity. The uniform TPMS sandwich structure with large on the drop hammer. The acceleration-time curve of the

Volume 3 Issue 4 (2024) 10 doi: 10.36922/msam.5729