## 4 Discussion  
Based on the numerical simulation results and curves presented in Section 3, this chapter further explores the deformation characteristics of nodes A\({}_{\rm e}\), B\({}_{\rm e}\), and D\({}_{\rm e}\), analyzes in depth the causes of equivalent stress and the radial displacement curve characteristics, explores the energy changes of nodes in critical travel, the sensitivity to radial displacement behavior after compression, and energy absorption efficiency, as well as the relationship between the compression rate and rotational speed. Due to the contact with the loading plate at node A\({}_{\rm e}\), according to its stress-strain rotation angle curve characteristics, the curve can be divided into three regions within the range \(\alpha\)-C to \(\beta\)-R, namely stage I, stage II, and stage III, as shown in Figure 12a. The A\({}_{\rm e}\) node's maximum stress and strain energy peaks occurred at the moment of contact with the loading plate, at 189.51 MPa and 421.91 MJ, respectively. Between A\({}_{\rm e}\)-C and B\({}_{\rm e}\)-R, the stress curve generated a second peak, with an extreme value of 113.65 MPa. The curve generated a third peak before B\({}_{\rm e}\)-R, with a peak of 45.49 MPa. At stage I, node A\({}_{\rm e}\) had not yet made contact with the loading plate, and the cell column \(\alpha\) was starting to be squeezed by the loading plate and it was transmitting the load clockwise and backward; a  
Figure 11: Node EF of A\({}_{\rm e}\), B\({}_{\rm e}\), and D\({}_{\rm e}\) nodes at different linear speeds (100 mm/s-320 mm/s). Figure 10: Radial displacement changes of nodes at different linear speeds (100–320 mm/s): (a) A\({}_{\rm e}\) node. (b) B\({}_{\rm e}\) node. (c) D\({}_{\rm e}\) node. wave peak in stage I was generated. As the roll-shaped honeycomb structure rotated, the attachment wings between the two cells became gradually parallel to the loading plate, and the equivalent stress at node A\({}_{\text{e}}\) decreased until it made contact with the loading plate. During the contact process between the A\({}_{\text{e}}\) node and the loading plate, the distance between A\({}_{\text{e}}\) and the roller axis gradually decreased, forming a phase II wave peak. After the A\({}_{\text{e}}\) node and loading plate contact was relieved, the curve entered stage III. Due to the effects of rotation and friction, the latter cell produced a circumferential tensile force on the cell where the A\({}_{\text{e}}\) node was located, forming a peak range again until the Be node left the loading plate and stage III ended. Figure 13 shows the relationship between the compression rate and the magnitude of work performed by the A\({}_{\text{e}}\) and B\({}_{\text{e}}\) node equivalent stress in stages I, II, and III, as well as the percentage of work in each stage to the total amount. It can be seen from Figure 13a that within the range of 10% to 15% compression rate, as the compression rate increased, the total amount of equivalent stress work also increased. The amount of work performed in stages I and II was positively correlated with the compression rate. The amount of work performed in stage III decreased as the compression rate increased, and the decrease gradually slowed. The proportion of work performed in stage III decreased accordingly. When the compression rate increased, the increase in the proportion of work by equivalent stress in stage II was significantly greater than that in stage I. This phenomenon may be because as the compression rate increased, the compression degree of the roller-shaped honeycomb increased, the deformation degree of the cells near the loading plate increased, and the contact area between the plate and the loading plate increased. The node stresses in the three stages all increased to varying degrees, while the second stage was the interval between the A\({}_{\text{e}}\) node and the loading plate, so the proportion of equivalent stress work performed by the nodes in the second stage also increased.