Novel strengthening methods for ultralightweight sandwich structures with periodic lattice cores

Abstract

Recent development of ultralightweight lattice-cored sandwiches is reviewed, with focus placed on various novel fabrication methods introduced to strengthen these structures, covering not only research results published in the Science China Series E-Tech Sci, but also those in other domestic and overseas scientific journals. cellular metals, strengthening method, fabrication, sandwich panels Citation:Lu T J, Zhang Q C. Novel strengthening methods for ultralightweight sandwich structures with periodic lattice cores.

Bending response of carbon fiber composite sandwich beams with three dimensional honeycomb cores

“…Sandwich structures effectively provide lightweight stiffness and strength by sandwiching a low-density core between stiff face sheets. The core materials were traditionally manufactured using stochastic metal or polymer foams [1][2][3], corrugated [4] honeycomb [5][6] and truss materials [7][8]. These combinations of properties are very important in the development of many contemporary vehicles and structures.…”

Fabrication and mechanical properties of composite pyramidal truss core sandwich panels with novel reinforced frames

“…Euler buckling of the struts. When the strut buckles, the relation between the applied force F and the axial force F A can be expressed as 1 4 F 1 ¼ F N sin ! ¼ wt cr sin !.…”

“…Since there are the reinforced frames for the nodes, the rod end constraint effect will increase. Thus, pyramidal truss core struts are considered as fixed-jointed at two ends, ¼ 1 2 . The Euler buckling load of an endclamped strut subjected to an axial pressure is estimated from cr ¼ 4 2 E s I l 2 wt .…”

“…It is known that such structures are manufactured by lightweight, stiff and strong materials such as aluminum, titanium alloys, and carbon fiber composites. Comparing with the conventional cores made by foams and honeycombs, 1–3 the lattice cores with tetrahedral, 4–8 pyramidal, 9–13 and Kagome 14–16 topological configurations are a new class of ultra-light weight structures, which possesses the additional potential for multifunctional applications without the penalty of load bearing capability due to their open interconnected constructions. Furthermore, it will provide a promising approach to manufacture cellular sandwich structures and develop lightweight multifunctional structural systems by using fiber reinforced composites.…”

Structural Design and Dynamic Compressive Properties of Ti–6Al–4V Hollow Lattice Structures

“…In history, the development of periodic lattice structures manufactured using the AM technique has gone through four stages: [ 10 ] 1) the formation of new ideas and development of fabricating technologies; 2) fabrication of lattice structures; 3) matured technologies and practical implementation of fabricated lattice structures; and 4) further enhancement of lattice structure performance (mechanical, thermal, acoustic, etc.). Nowadays, the main research has concentrated on stage 4).…”