Multiple Crashworthiness Evaluation of Double‐V Negative Poisson's Ratio‐Filled Square Tube Under Axial Impact

Abstract

Thin‐walled structures are used extensively in the passive safety of vehicles to absorb energy. The thin‐walled tube is already a traditional structure with excellent energy absorption. Negative Poisson's ratio (NPR) structures produce an inward concentration to increase the stiffness of the structure during axial compression. The concept of fluctuation of crushing force (FoCF) is introduced herein to evaluate this new energy‐absorbing box as an energy‐absorbing device based on the traditional energy absorption evaluation index. Based on experimental validation, a finite‐element model is developed that can accurately predict the crashworthiness of the double‐V NPR‐filled square tube (DVFST). The following parameters, such as out‐of‐plane thickness, meta‐cell half‐width beam thickness, and beam angle tube thickness, are conducted to assess the crashworthiness of the DVFST structure. The first thing that should be considered in the design of the DVFST structure is the half‐width of the cell, followed by the angle of the long beam, and then the relative wall thickness of the long and short beams. The DVFST structure has the potential to become an excellent energy‐absorbing device by adjusting its parameters.

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.…”

Auxetics and Other Systems with Unusual Characteristics

“…Using the finite element method, the authors conclude that by adjusting parameters of the studied structure one can obtain an excellent energy absorbing device. [ 12 ]…”

Poisson's Ratio of f.c.c. Hard‐Sphere Crystals with Cubic Supercells Containing Four Nanochannels Filled by Hard Spheres of Another Diameter

“…[19,20] In this work, we use the more recent classification [20] which distinguishes between nonauxetics, partial auxetics, and auxetics. Vast potential applications of auxetic materials drive the theoretical and experimental investigations, which branch into auxetic metamaterials, [21][22][23][24][25][26][27][28] models, [16,[29][30][31][32][33][34][35][36][37][38][39][40][41] structures, [42][43][44][45][46][47][48] polymers, [49,50] composites, [51] foams, [52][53][54] and fabrics. [55][56][57][58] Most of the research on auxetics is focused either on developing new materials or searching for auxetic properties in existing ones.…”