Compression and energy absorption properties of the truss-like lightweight materials based on symmetric groups

Abstract

Truss-like lightweight materials (TLMs) have been widely used in aeronautics and astronautics, because of excellent mechanical property and superior energy absorption capability. The design of TLMs’ meso-structures was a critical task to improve its performance. Hence, a structure design method based on the symmetric groups was proposed for TLMs, and a novel hexagonal prism TLM’s meso-structure was deduced by the symmetric and translational operations of the space group P6mm. To investigate the performance of the novel TLM, the mechanical analysis model was established. The predictive equations of compression performance was proposed based on Euler-Bernoulli beam theory. The stress distribution of the novel TLM’s meso-structure under compression load was discussed by the finite element analysis method, and its compression and energy absorption properties were investigated. The simulation results were in agreement with the predictive results. In addition, the common FCC and BCC TLMs were discussed using the symmetry group analysis method, and their compression properties were predicted. The results showed that the proposed novel TLM in this study had better compression property than BCC and FCC TLMs at the same relative density.

Comparison study of the in-plane crushing failure behavior of traditional and arc-curved hexagonal honeycomb

“…To improve the energy absorption ability, the additively manufactured cellular structure with two different kinds of materials are conducted with crush test [7]. The biomimetic sandwich plate box, truss-like lightweight structure, foam filled hat-stiffened CFRP shell have better performance, and they has great application potential in aircraft [8][9][10][11].…”

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

“…Modern 3d-printing technologies allow to produce the lattice metamaterials with complex geometry of the unit cells that provides their unique mechanical properties such as the ultra-high and tailorable specific stiffness and strength 5,6 , high impact strength [7][8][9] and wide band gaps in the dynamic response [10][11][12] , negative Poisson's ratio, thermal expansion or stiffness [13][14][15] , pronounced non-classical Cosserat-type and Mindlin-type macroscale behavoir [16][17][18][19] , etc. The design of the unit cells in the lattice structures are usually defines the position, size and orientation of the struts to provide some desired topology and related macroscopic response such that the stretch-dominated behavior [20][21][22] , the quasi-isotropic averaged properties 23,24 , the prescribed anisotropy and the symmetric groups 25,26 or the functionally graded structure 27,28 .…”

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

“…Modern 3d-printing technologies allow to produce the lattice metamaterials with complex geometry of the unit cells that provides their unique mechanical properties such as the ultra-high and tailorable specific stiffness and strength 5 , 6 , high impact strength 7 – 9 and wide band gaps in the dynamic response 10 – 12 , negative Poisson’s ratio, thermal expansion or stiffness 13 – 15 , pronounced non-classical Cosserat-type and Mindlin-type macroscale behavoir 16 – 19 , etc. The design of the unit cells in the lattice structures usually defines the position, size and orientation of the struts to provide some desired topology and related macroscopic response such that the stretch-dominated behavior 20 – 22 , the quasi-isotropic averaged properties 23 , 24 , the prescribed anisotropy and the symmetric groups 25 , 26 or the functionally graded structure 27 , 28 .…”