EFFECT OF VELOCITY ON THE COMPRESSION BEHAVIOR AND ENERGY ABSORPTION OF THE NOVEL AUXETIC STRUCTURE

This study presents a novel two-layered auxetic geometry specifically designed for enhanced energy absorption under impact loading. The structure integrates an inverted honeycomb outer layer to promote auxetic behavior, reinforced by a hexagonal inner layer and a strategically positioned middle link to enhance stiffness. Specimens were fabricated using FDM-based 3D printing with ABS material and experimentally tested under uniaxial compression. A validated finite element (FE) model was developed and used to investigate the influence of impact velocities ranging from 10 m/s to 100 m/s. Results indicate that compression response, Poisson’s ratio, and deformation modes are highly sensitive to velocity. Higher impact velocities resulted in increased peak stress and significantly enhanced specific energy absorption. However, auxetic performance decreased at elevated velocities due to expedited plastic deformation. The proposed geometry demonstrates strong potential for advanced energy-absorbing applications such as ballistic protection systems and smart structural components.

Keywords: Auxetic material, Smart material, Energy Absorption, Meta-materials.