The compressive properties and strengthening mechanism of the middle-trabecular beetle elytron plate

Abstract

For the development of new types of lightweight sandwich structures, the compressive properties and strengthening mechanism of the middle-trabecular beetle elytron plate were investigated for various values of η (the ratio of the trabecular radius to the honeycomb wall length). The results are as follows: (1) When η = 0.1, the increases in the compressive strength and standard energy absorption capacity of the middle-trabecular beetle elytron plate compared with the honeycomb plate exceed those of the end-trabecular beetle elytron plate; with an increase to η = 0.15, the compressive strength remains nearly the same, the energy absorption capacity undergoes a significant further increase, and the trabeculae exhibit Φ-type failure. (2) The strengthening mechanism that gives rise to the compressive properties of the middle-trabecular beetle elytron plate is proposed as follows: the trabeculae are located at the center of the honeycomb walls, where the maximum deformations would otherwise occur; they constrain the deformation of the honeycomb walls; and the number of trabeculae in the middle-trabecular beetle elytron plate also exceeds that in the end-trabecular beetle elytron plate. (3) Middle-trabecular beetle elytron plates have the advantage of facile manufacturing, which will establish a basis for promoting the application of beetle elytron plates.

A new type of bionic grid plate—The compressive deformation and mechanical properties of the grid beetle elytron plate

“…Figure 4 shows the deformation and failure modes of each sample of sandwich plates during compression tests. To better understand the results, the previously reported deformation and failure modes of the MBEP and EBEP are also shown (Figure 4(e) and (f)) [43]. The contact area of the honeycomb walls within the GP represents a type of opening cross-section structure.…”

“…(a) The GP. (b)–(d) The GBEP (η c = 0.14, 0.18, and 0.22, respectively), (e) The EBEP [44], and (f) MBEP [43].…”

“…Furthermore, the trabeculae of the EBEP exhibit S-type deformation [44]. Therefore, there are four deformation modes of the hollow trabeculae and honeycomb walls in the core structure, namely, C-type, Φ-type, B-type and S-type deformation, have been reported for the core structure of BEPs [43]. It should be noted that concave deformation in the middle part associated with B-type deformation of the MBEP is the reverse of convex deformation in the middle part associated with Φ-type deformation of the MBEP because convex deformation and concave deformation are two different manifestations of the same deformation modes; therefore, they were both referred to as Φ-type deformation [43].…”

“…The influences of the dimensions and modeling methods of BEPs with the same core thickness and the same core volume on their mechanical properties were also investigated [41,42]. Moreover, the compressive mechanical properties of the middle-trabecular beetle elytron plate (MBEP), whose trabeculae are arranged at the centers of the honeycomb walls, were also illustrated [43]. In the abovementioned studies, we noted that improving the mechanical properties of the BEP by appropriately increasing the constraints on the trabecula is highly beneficial.…”

Out-of-plane dynamic crushing behavior of joint-based hierarchical honeycombs

“…[54] proposed a so-called hollow-cylindrical-joint honeycomb (H-C, Figure 1(d)), and its in-plane mechanical properties were analytically studied. Later, the plastic collapse mechanism [55], compressive strength, and EA [56–59] of H-C were also investigated. By connecting a central circle to other six circles in a hexagonal shape, Hu et al.…”