Page 71 - MSAM-2-1

Materials Science in Additive Manufacturing Energy absorption of Moore’s thin-walled structures

Table 2. Energy dissipation ratio for the 2 and 3 order structures after cyclic loading
nd
rd
Properties 2 order structure 3 order structure
rd
nd
Loading direction 1 Loading direction 2 Loading direction 1 Loading direction 2
Dissipated energy (J) 1.48 4.15 1.13 4.01
Stored energy (J) 4.57 11.11 2.64 7.82
Energy dissipation ratio 0.32 0.37 0.42 0.51

A

B

C

D

Figure 13. Comparison of effective stress-strain curves between the 3 and 4 order structures (left panels), and magnified curves of the 4 order
th
rd
th
structures (right panels) obtained from FE models during quasi-static compression from (A) loading direction 1 (LD1) and (B) loading direction 2 (LD2).
(C) Deformation of the 4 order structure with relative density (rd) of 20% under LD1. (D) Deformation of the 4 order structure with relative density of
th
th
40% under LD2. Shell elements are rendered with actual thickness.
strain and energy dissipation ratio demonstrated 1. This phenomenon was attributed to the less compliant
resilience in the 2 order fractal-inspired thin-walled behavior of the 2 order structure when compared to the
nd
nd
structure under cyclic loading from in-plane direction 3 order structure.
rd
Volume 2 Issue 1 (2023) 12 https://doi.org/10.36922/msam.53