Influence of Cell Size on Re-Entrant Transformation of Negative Poisson's Ratio Reticulated Polyurethane Foams

Wang, Yun-Che; Lakes, Roderic S.; Butenhoff, Amanda

doi:10.1177/026248930102000601

Cited by 48 publications

(50 citation statements)

References 7 publications

(18 reference statements)

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“…al. [3], but higher than those reported elsewhere [2,[8][9][10][11]. The Poisson's ratio of foam -following a compression and heat treatment process -is influenced by a number of factors, including the composition and porosity of the candidate foam, the The work presented here has indicated further potential for auxetic foam to be applied to sports safety equipment, although further research is required.…”

Section: Discussionmentioning

confidence: 62%

Auxetic Foams for Sport Safety Applications

Allen

Martinello

Zampieri

et al. 2015

Procedia Engineering

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Auxetic materials offer potential to be applied to sports safety equipment. This work reports quasi-static and impact testing of auxetic open-cell polyurethane foam -fabricated with a compression and heat treatment process -in comparison to its conventional counterpart. The foam was compressed to 70% of its original dimension along each dimension during the conversion process. Quasi-static compression testing confirmed the converted foam to be auxetic, with a Poisson's ratio of -0.08. Impact testing was performed for energies up to 5.6 J with an instrumented drop rig and high-speed video. Peak accelerations were ~3 times lower for the auxetic foams, because they prevented bottoming. This work has shown further potential for auxetic foam to be applied to sports safety devices. Future work should look to optimise foam selection and the conversion process, while comparing auxetic foam with existing materials and products.

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Section: Discussionmentioning

confidence: 62%

Auxetic Foams for Sport Safety Applications

Allen

Martinello

Zampieri

et al. 2015

Procedia Engineering

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“…Since then, a large number of research papers, patents, and theses have been published related to the fabrication, characterization, theoretical, and mechanical modeling of such foams (22,(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(73)(74)(75)(76)(77)(78). Their enhanced mechanical properties such as indentation resistance, shear resistance, fracture toughness, viscoelastic loss, sound absorption, and high-density were reported by authors in Refs.…”

Section: Auxetic Polymeric Foamsmentioning

confidence: 99%

Three decades of auxetic polymers: a review

Bhullar

2015

E-Polymers

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Developments in design and technology in the engineering and medical fields necessitate the use of smart and high-performance materials to meet higher engineering specifications. The general requirements of such materials include a combination of high stiffness and strength with significant weight savings, resistance to corrosion, chemical resistance, low maintenance, and reduced costs. Over the last three decades, it has been demonstrated that auxetic materials offer a huge potential for the fields of engineering, natural sciences, and biomedical engineering, and for many other industries, including the aerospace and defense industries, through their unique deformation mechanism and measured enhancements in mechanical properties. To meet future engineering challenges, auxetic materials are increasingly being recognized as integral components of smart and advanced materials. Although materials with a negative Poisson's ratio have been known since the early 1900s, they did not capture researchers' attention until the late 1980s. Since 1991, these materials have been known as auxetic materials. Since then, their benefits and applications have been expanded to all major classes of materials such as metals, ceramics, polymers, and composites, and they are also now being used in engineering applications. The goal of this review was to present the development of auxetic polymers, which were first fabricated in the form of polyurethane foam approximately three decades ago and are now used in the fabrication of non-woven nano/ micropolymeric structures. This review could provide useful information for the future development of auxetic polymers.

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“…Foams displaying isotropic and anisotropic mechanical properties can be produced [41,42]. Microcellular foam and closed-cell foam have also both been converted into auxetic form [43,44]. Figure 5 shows micrographs of a polyurethane foam before and after conversion to auxetic form, showing a contorted three-dimensional re-entrant topology for the auxetic foam compared to the regular convex cell structure of the conventional starting foam material [45].…”

Section: Foamsmentioning

confidence: 99%

Auxetic materials

Alderson

2007

Proceedings of the Institution of Mechanical Engineers, Part G:

411

286

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Abstract:The current status of research into auxetic (negative Poisson's ratio) materials is reviewed, with particular focus on those aspects of relevance to aerospace engineering. Developments in the modelling, design, manufacturing, testing, and potential applications of auxetic cellular solids, polymers, composites, and sensor/actuator devices are presented. Auxetic cellular solids in the forms of honeycombs and foams are reviewed in terms of their potential in a diverse range of applications, including as core materials in curved sandwich panel composite components, radome applications, directional pass band filters, adaptive and deployable structures, MEMS devices, filters and sieves, seat cushion material, energy absorption components, viscoelastic damping materials, and fastening devices. The review of auxetic polymers includes the fabrication and characterization of microporous polymer solid rods, fibres, and films, as well as progress towards the first synthetic molecular-level auxetic polymer. Potential auxetic polymer applications include self-locking reinforcing fibres in composites, controlled release media, and self-healing films. Auxetic composite laminates and composites containing auxetic constituents are reviewed and enhancements in fracture toughness, and static and low velocity impact performance are presented to demonstrate potential in energy absorber components. Finally, the potential of auxetics as strain amplifiers, piezoelectric devices, and structural health monitoring components is presented.

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Influence of Cell Size on Re-Entrant Transformation of Negative Poisson's Ratio Reticulated Polyurethane Foams

Cited by 48 publications

References 7 publications

Auxetic Foams for Sport Safety Applications

Auxetic Foams for Sport Safety Applications

Three decades of auxetic polymers: a review

Auxetic materials

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