Mechanical behavior of sandwich panels with tetrahedral and Kagome truss cores fabricated from wires

Wires are great candidates as the raw material for truss periodic cellular metals because they can display high strength as in piano wires, are easy to fabricate, and can be controlled to be defect free. New approaches based on tri-axial weaving of wires to create ideal trusses, i.e., tetrahedral and Kagome truss have been presented. The mechanical properties of the sandwich panels with the truss cores fabricated by using the new approaches under compression and bending loadings are analyzed by elementary beam theory and experiments. The relative density, stiffness, and strength of the sandwich panels are estimated by the derived equations and compared with the measured results. The failure mechanisms of the sandwich panels are analyzed, and also benefits and shortcomings of each approach with respect to mechanical performance and production are discussed.