Strength of Sandwich Structures with Pyramidal Lattice Cores Under Quasi-Static Compressive Loadings

A lattice material is a new-type multifunctional material with lightness and high strength， which has broad application prospects in the ship researching field. Traditional metal lattice materials are usually fabricated through welding or gluing， and the process may leave defects between panels and lattices. Aiming at the problem， this paper proposes a new fabrication technology of hybrid reinforced pyramidal lattice truss cores. Firstly， the elastic constitutive relations of the lattice material under quasi-static compressive loadings are analyzed. Then， the experimental results of the corresponding quasi-static compressive tests are provided. It is seen that when the loadings increase， the metal rod starts to suffer from plastic yielding， and rod fractures eventually appear at the center region. Finally， a comparison between the experimental results and the analytic approximation reveals only trivial differences， which successfully validates the proposed technique.