Page 430 - IJB-9-6

International Journal of Bioprinting Versatile pomelo peel-inspired structures

Figure 7. The stress–strain compressive curves of BPPSs with different VFs: (A) 45%, (B) 40%, (C) 35%, and (D) 30%. Mechanical performance indicators
of BPPSs: (E) specific energy absorption (W ) and specific strength (s ). (F) Comparison of W of BPPSs with other lightweight structures [20,33,39,40,53-58] .
s
s
s
the formation of larger molten pools. Furthermore, the compression. As shown in Figure 7A–D, the stress–
combined effect of slower cooling rate, gravity, and surface- strain curves of FEA were in good agreement with the
tension within the molten pool contributed to the formation experimental curves, which could verify the accuracy of
of larger dross defects. Therefore, reducing the size of the FEA. The slightly different tendencies in the force drop
overhanging surface and increasing the inclination angle of region between the experiment and FEA results may be
the overhanging surface are potential methods to optimize attributed to the deviation between the actual samples
the dross defects on the downward-facing surface . and the FEA model. The surface roughness and dross
[40]
formation led to a more obvious force drop region in the
3.2. Mechanical properties actual structure during compression experiments. In the
Figure 7 presents the results of experiments and FEAs on initial elastic deformation region, the compressive strength
the mechanical responses of as-fabricated BPPSs under of the four BPPSs were 63.47 MPa (45%), 42.01 MPa (40%),

Volume 9 Issue 6 (2023) 422 https://doi.org/10.36922/ijb.1011