Dynamic Compressive Mechanical Behavior of a Novel Three-Dimensional Re-Entrant Honeycomb (3D-RH) Structure

Negative Poisson's ratio structural materials have unique deformation characteristics and excellent mechanical properties, and are widely used in multiple key fields, such as aerospace, nuclear safety, rail transit, and so on. However, most of them are two-dimensional negative Poisson's ratio structural materials, and the mechanical design and performance evaluation of dynamic behavior of three-dimensional novel negative Poisson's ratio structural materials deserve more attention. Inspired by the deformation mechanism of the traditional two-dimensional re-entrant honeycomb (2D-RH) structure, this study extends the planar structural characteristics to the spatial dimension and proposes a novel three-dimensional re-entrant honeycomb (3D-RH) structure. Experimental testing, theoretical analysis, and numerical simulation are all utilized to study its quasi-static and dynamic compressive mechanical properties and deformation processes. The novelty of this paper lies in the novel 3D-RH structure and the investigation of the static and dynamic mechanical behavior. The testing results indicate that the quasi-static compressive performance curve of the 3D-RH pattern is a typical bending-dominated deformation behavior, and the dynamic mechanical properties of the 3D-RH structural pattern exhibit an apparent strain rate effect. In addition, Ashby maps are also plotted to demonstrate its acceptable performance characteristics, indicating its potential attractive application prospects in innovative development of lightweight, high-specific-stiffness, and high-specific-strength structural materials.