CURVED-LIGAMENTED AUXETIC TRUSS STRUCTURE

Abstract

The invention relates to an auxetic lattice structure (A) exhibiting a negative Poisson ratio (auxetic behavior), having a high specific energy absorption capacity, and being parametrically designed. This structure consists of repeating modules, each called a unit cell (10); the unit cells (10) perform controlled rotational and unfolding motion under load thanks to an internal mechanism coordinated with the top plate (12), bottom plate (16), curved side walls (11), internal connecting rod (13), side arms (15), upper compact region (14) and point P (p). The curved side walls (11) enable transverse expansion, while the internal connecting rod (13) activates the rotational motion around point P (p), making it possible to achieve both a high negative Poisson ratio and energy absorption capacity. Side arms (15) support the second stage opening, the upper compact region (14) stabilizes the load distribution and the ratio of the k parameter (k) to the wall thickness (t / n) is used to adjust the severity of the auxetic behavior and mechanical performance.This coordinated structure eliminates the geometric, mechanical, and manufacturing limitations of existing auxetic lattices by providing homogeneous deformation and stable energy absorption at the panel scale.