Quasi‐Static Mechanical Properties of a Modified Auxetic Re‐Entrant Honeycomb Metamaterial

Abstract

Auxetic metamaterials possess superior properties and have drawn extensive attention in the past decades. Herein, two curved ribs are added to the conventional re‐entrant (CRE) honeycomb structure to form a modified auxetic re‐entrant (MRE) honeycomb structure for improving the energy absorption capacity of the structure. In‐plane quasi‐static compression response of the honeycomb in large deformation is numerically explored first. Then, quasi‐static compression test is conducted to verify the validity of the numerical simulation. Both experimental and numerical simulation results reveal that during the quasi‐static compression process, two plateau stresses occur in the load–displacement curves of the structure, and the second plateau stress is much higher than the first one. The occurrence time of the second plateau stress can be controlled by the distance between the concave curved ribs in the structure. The experimental results are in good agreement with the finite element analysis results. Due to their desirable mechanical properties, the MRE honeycomb structures have great potential for applications in civil engineering, vehicle crashworthiness, and protective infrastructure.

Cancellation of Auxetic Properties in F.C.C. Hard Sphere Crystals by Hybrid Layer-Channel Nanoinclusions Filled by Hard Spheres of Another Diameter

“…However, the start of the cyclic scientific conferences on auxetic and related systems was the reason why the studies on auxetic materials gained pace. New man-made auxetic materials in the form of foams [6,7,8], polymers [9,10] and composites [11], as well as in the specifically engineered structures [12,13,14,15,16,17,18], nanostructures [19], or metamaterials [20,21,22,23,24,25,26,27] have been reported. Novel fabrics with auxetic properties [28,29,30,31], targeted for personal applications have been developed.…”

Enhancing the Mechanical Properties of Auxetic Metamaterials by Incorporating Nonrectangular Cross Sections into Their Component Rods: A Finite Element Analysis

“…[ 6–8 ] In addition to examining structures with negative PR, researchers have also paid attention to designing metamaterials with negative thermal expansion. [ 9,10 ] Auxetic materials of different scales, from molecular structures [ 11 ] to macroscale configurations, [ 12,13 ] have been investigated, thus confirming their applicability in various areas. [ 14 ]…”

Auxetics and Other Systems with Unusual Characteristics

“…By applying experimental studies and numerical simulation the authors expect applications of their material in civil engineering, vehicle crashworthiness, and protective infrastructure. [ 10 ]…”