How does negative Poisson’s ratio of foam filler affect crashworthiness?

Hou, Shujuan; Liu, Taiqu; Zhang, Zhidan; Han, Xu; Li, Qing

doi:10.1016/j.matdes.2015.05.050

Cited by 130 publications

(34 citation statements)

References 46 publications

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“…An improvement in these properties confers a great potential to the auxetic material to be used in a broad range of applications, which include biomedical fields, personal protective equipment, garment, crash boxes, vehicle, and aircraft seats, anti‐vibration gloves and others . It has been shown in crashworthiness applications, for instance, that despite a slight increase in the peak load, the auxetic foams may improve the majority of crashworthiness indicators such as energy absorption, specific energy absorption, and crush force efficiency . In a similar vein, the great energy absorption capability of auxetic foams makes them to be used as the sport impact protector devices such as pads, helmets, and mats, resulting in more comfort and safety with lighter and/or thinner equipment …”

Section: Introductionmentioning

confidence: 99%

Quasi Tri‐Axial Method for the Fabrication of Optimized Polyurethane Auxetic Foams

Mohsenizadeh

Ahmad

Alipour

et al. 2019

Physica Status Solidi (b)

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This paper describes the fabrication of polymeric auxetic foam using a quasi tri-axial compression method. In this method, the conversion process is executed by applying a quasi tri-axial compression on conventional closedcell polyurethane foams. In order to achieve optimum auxetic characteristics, the densification points in various directions are evaluated. In addition, the heating time of the compressed foam is also determined and applied to minimize the residual stress due to the volumetric compression. It leads to the fabrication of auxetic foams with achievable maximum re-entrancy and minimum collapsed cells without surface creasing. The results also show that the optimized auxetic foam exhibits isotropic behavior compared to its precursor foam as verified by the morphological analysis. The produced foam has all the desired properties of auxetic foams. The auxetic foam with a negative Poisson's ratio may have a great potential as the supplementary materials in energy absorption and structural applications.

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Section: Introductionmentioning

confidence: 99%

Quasi Tri‐Axial Method for the Fabrication of Optimized Polyurethane Auxetic Foams

Mohsenizadeh

Ahmad

Alipour

et al. 2019

Physica Status Solidi (b)

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“…These studies are usually performed by modeling the discrete lattice that represents a particular auxetic material [3][4][5]. For example, Hou et al [6] compared the crushing strength of auxetic and regular honeycomb structures. They reported that for the same slenderness ratio, the auxetic honeycombs have a higher crushing strength when compared to regular honeycombs.…”

Section: Introductionmentioning

confidence: 99%

Impact on auxetic and metal foams

Kumar¹,

Khaderi²,

Rao³

2019

Vib. proced.

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Using the finite element method, we investigate the elasto-plastic impact of a rigid sphere on a half-space of auxetic and metal foams. The validity of the Hertz theory for elastic impacts is investigated for both positive and negative Poisson's ratio. For elastic impacts, the results from Hertz theory are accurate within 20 % with the finite element simulations. The plasticity is modeled using the Deshpande-Fleck metal foam yield criterion. This yield criterion allows for plastic compressibility and can also accommodate materials having a negative Poisson's ratio. The elasto-plastic simulations reveal that the coefficient of restitution decreases as the impact velocity is increased. The coefficient of restitution is also least for materials having a zero plastic Poisson's ratio. Our study suggests for maximum energy dissipation the plastic Poisson's ratio should be close to zero.

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“…Past studies were mostly concerned with the quasi-static elastic behaviour of uniform auxetic structures at very small strains [3] and limited ballistic resistance study [4]. Mechanical behaviour of some particular auxetic structures was characterised by uniaxial quasi-static compressive and tensile tests [5][6][7][8][9][10]. The Split-Hopkinson Pressure Bar (SHPB) experiments were also carried out for auxetic cellular structures fabricated with additive manufacturing, including also polymer fillers [11].…”

Section: Introductionmentioning

confidence: 99%