## 3 Results and Discussion
### Quasi-Static Compression Testing
Furthermore, it has been observed that the BCC metal structures described in the reference [5] do not exhibit a significant plateau region and tend to collapse under a stretching-dominated structure [5]. On the other hand, polymer lattices fabricated with polymer-cured resin have been found to collapse under a bending-dominated structure [25]. It is evident from the literature that the fabrication technique, in addition to architecture and material, plays a crucial role in determining the mode of collapse [29]. Thus, individual structure architecture might not offer enough data to determine the exact collapsed mode of individual lattice structures, but the combination of at least three parameters: the lattice architecture, material in-use and manufacturing technique, could be the essential information for making a prediction. In this test matrix, all the lattices, constructed with the same material and technique, show that stress over strain curves for individual structures could offer the same repeated result (see Figure 5). The cohort of the stress-strain curves in Figure 5, indicates a sequence of layer collapse, consistent with what has been previously documented [5]. However, it would not be rational to represent these findings on a single graph, as the stress-strain curve of the BCC + CP exhibits a random breakage of collapsing peaks subsequent to the ultimate strength. Figure 6 presents a graphical representation of stress-strain curves for various lattice structures, with reference to the CP structure. A strong correspondence is observed between the maximum stress of the CP and the plateau stress of the BCC. A considerable concurrence is observed between the peak stress exhibited by the CP and the stress level maintained at the plateau stage of the BCC (refer to Figure 6i). This convergence is particularly notable from approximately 10 to 48 per cent of the applied strain rate1. The combination of the highest stresses arising from the CP and the BCC displays a superposition effect that seems to exhibit a similar pattern to the lowest stress levels in the BCC + CP composite structure, but this is not true for the BCC + CP structure itself. This conclusion is coincidental since this phenomenon does not occur when the CP is paired with the FCC, as shown by the results in Figure 6 ii. Footnote 1: The stress-strain curves for the BCC + CP are shown in Figure 6.  
In contrast to CP, BCC, and BCC + CP, the concepts of superposition do not apply to FCC and FCC + CP. When introducing CP structure with FCC, a considerable enhancement in yield stress along the strain is possible. The maximum yield stress for FCC and FCC + CP are 357.4 \(\pm\) 0.3 kPa and 1244.0 \(\pm\) 1.6 kPa, respectively. Additionally, it appears that FCC  
Figure 6: Stress-strain curves with the different lattice structures referencing with the CP structure. **(i)** superposition between CP and BCC does not equivalent with BCC + CP **(ii)** superposition between CP and FCC would not agree with FCC + CP; however, it clearly shows the agreement in rhythmic failure. may experience a somewhat quicker collapse in each layer than CP, although FCC and FCC + CP share the same collapsing strain precisely. Both FCC and FCC + CP exhibit higher initial stress compared to BCC and BCC + CP. Another aspect that necessitates examination is the elastic modulus (E, Pa). The results of this study indicate a notable tendency for collapse that warrants attention, particularly with regards to the alterations observed in the elastic modulus of CP structures. Specifically, CP layers exhibited a remarkably similar elastic modulus, resulting in an insignificant variation of approximately 10.7 \(\pm\) 0.2 MPa.4. Although the outcomes did not exhibit a substantial response, they experienced a decrease of 63 per cent relative to the peak value of 16.07 \(\pm\) 2.7 MPa. The elastic modulus of the BCC structure differed from that of the CP structure and other structures in the examined matrix.