In-plane dynamic crushing of re-entrant auxetic cellular structure

Liu, Wangyu; Wang, Ningling; Luo, Tao; Lin, Zhanyi

doi:10.1016/j.matdes.2016.03.086

Cited by 231 publications

(87 citation statements)

References 31 publications

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“…Honeycomb sandwich panels with auxetic cores were found to resist ballistic impacts better than regular or rectangular cores [303], and absorb more impact energy when the re-entrant cell structure was non-uniform [304]. Laminated composites containing warp knit auxetic Kevlar ® fabric reinforcement, under 167 m/s impact with a 14.9 g bullet (~200 J), showed similar energy absorption to laminates containing conventional woven Kevlar ® reinforcement [305,306].…”

Section: Appl Sci 2018 8 X 12 Of 31mentioning

confidence: 92%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

228

151

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Following high profile, life changing long term mental illnesses and fatalities in sports such as skiing, cricket and American football-sports injuries feature regularly in national and international news. A mismatch between equipment certification tests, user expectations and infield falls and collisions is thought to affect risk perception, increasing the prevalence and severity of injuries. Auxetic foams, structures and textiles have been suggested for application to sporting goods, particularly protective equipment, due to their unique form-fitting deformation and curvature, high energy absorption and high indentation resistance. The purpose of this critical review is to communicate how auxetics could be useful to sports equipment (with a focus on injury prevention), and clearly lay out the steps required to realise their expected benefits. Initial overviews of auxetic materials and sporting protective equipment are followed by a description of common auxetic materials and structures, and how to produce them in foams, textiles and Additively Manufactured structures. Beneficial characteristics, limitations and commercial prospects are discussed, leading to a consideration of possible further work required to realise potential uses (such as in personal protective equipment and highly conformable garments).

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Section: Appl Sci 2018 8 X 12 Of 31mentioning

confidence: 92%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

228

151

View full text Add to dashboard Cite

show abstract

“…In the latter case, disorder has little affect on the Poisson's ratio. In contrast, studies on disordered versions of the re-entrant hexagonal lattice 19,20 demonstrate that disorder can change the impact resistance 21 and decrease the magnitude of the Poisson's ratio and yield strength significantly 22,23 . The re-entrant hexagonal geometry is a prototypical ordered auxetic lattice, whose mechanical behaviour has been extensively studied [24][25][26][27][28] .…”

Section: Introductionmentioning

confidence: 94%

Mechanics of disordered auxetic metamaterials

et al. 2018

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Auxetic materials are of great engineering interest not only because of their fascinating negative Poisson's ratio, but also due to the possibility to increase by design the toughness and indentation resistance. The general understanding of auxetic materials comes mostly from ordered or periodic structures, while auxetic materials used in applications are typically strongly disordered. Yet, the effect of disorder in auxetics has rarely been investigated. Here, we provide a systematic theoretical and experimental study of the effect of disorder on the mechanical properties of a paradigmatic two-dimensional auxetic lattice with a re-entrant hexagonal geometry. We show that disorder has a marginal effect on the Poisson's ratio until the point when the lattice topology becomes altered, and in all cases examined the disorder preserves the auxetic characteristics. Depending on the direction of loading applied to these disordered auxetic lattices, either brittle or ductile failure is observed. It is found that brittle failure is associated with a disorder-dependent tensile strength, whereas in ductile failure disorder does not affect strength. Our work thus provides general guidelines to design and optimize elasticity and strength of disordered auxetic metamaterials.

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“…A similar meshing condition has been used in other published works of cellular structures. [56,57] Self-contact is defined with a fitted plastic-plastic friction coefficient of 0.35 being used in the model. [48] In the simulation, force-displacement is recorded, the deformation of the structures under compression is analyzed, and central point of the outermost left-right columns is recorded for calculating Poisson's ratio from the captured images.…”

Section: Fe Model and Materialsmentioning

confidence: 99%

Numerical and Experimental Studies on the Deformation of Missing‐Rib and Mixed Structures under Compression

Tang

Wang

et al. 2020

Physica Status Solidi (b)

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Auxetic materials are an active research area with many potential applications. [1-8] There are many mechanisms/structures that have been developed to generate negative Poisson's ratio behaviors, including re-entrant structures, chiral structures, rotating rigid/semirigid units and angle-ply laminates. [7-15] These established mechanisms and the capacity of designing Poisson's ratio through controlled heterogeneity have opened up the possibility of developing material systems with targeted Poisson's ratios. The unique properties of auxetic structures lead to a wide range of applications, such as novel fasteners, biomedical applications, energy-absorbing devices, acoustic dampers, membrane filters with variable permeability, personal protective equipment, smart implant, actuators, and sensors. [12-16] These applications targeted require a detailed understanding of deformation of auxetic structures at both local cell level (beam bending, rotation, buckling, and contact) and macroscales (e.g., sample deformation) to balance the mechanical requirements as well as the functional properties. [17-27] In addition, the stability of Poisson's ratio and auxeticity under different loading modes and strain levels is also important. The deformation of porous materials under a compression load is more complex than simple uniaxial tension loading. The deformation of different auxetic structures under compression has been increasingly studied, [28-37] such as negative Poisson's convex-concave foams, [30] re-entrant unit cell, [31-34] disordered auxetic metamaterials, [35] cellular frameworks, [36] arrowhead structures, [29] and missing-rib (MR) auxetic structures. [29-37] Yang et al. [29] studied the behavior of auxetic structures under compression using both static model and dynamic finite-element (FE) modeling. The results show that auxetic materials could be effective in reducing the shock forces. The properties, such as stiffness, Poisson's ratio, and efficiency in shock absorption were found to be dependent on the structure and material combinations. Dong et al. [31] studied the compressive mechanical properties of the metallic auxetic re-entrant honeycomb. The work found that the modeling results were affected by the number of cells used in the FE model. Wang et al. [33] compared the characterization of composite 3D re-entrant auxetic cellular structures made from carbon fiber-reinforced polymer and single materials. The composite re-entrant auxetic structure showed the potential to significantly increase the specific stiffness of the structure. Remennikov et al. [34] studied the quasi-static compression and drop hammer impact tests of sandwich panel with re-entrant honeycomb design. The results suggest that sandwich panels with a re-entrant honeycomb core have a strong potential for enhancing the performance of lightweight impact-resistant protective systems. Apart from research on single mechanism structures, several works have been reported, exploring the use of mixed structures (MSs), which combined auxetic structures o...

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In-plane dynamic crushing of re-entrant auxetic cellular structure

Cited by 231 publications

References 31 publications

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Mechanics of disordered auxetic metamaterials

Numerical and Experimental Studies on the Deformation of Missing‐Rib and Mixed Structures under Compression

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