Hybrid auxetic foam and perforated plate composites for human body support

Mohanraj, H.; Ribeiro, Sylvie; Panzera, Túlio Hallak; Scarpa, Fabrizio; Farrow, Ian R; Jones, Roy; Davies-Smith, Angela; Remillat, Chrystel D L; Walters, Peter; Peng, Hua-Xin

doi:10.1002/pssb.201600106

Cited by 23 publications

(22 citation statements)

References 40 publications

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“…There exist various mechanisms that can lead to auxetic behavior. The most common include chiral structures, rotating rigid units, re‐entrant cells, and more recently perforations . However, other mechanisms exist that can lead to auxetic behavior.…”

Section: Introductionmentioning

confidence: 99%

Different Deformation Mechanisms Leading to Auxetic Behavior Exhibited by Missing Rib Square Grid Structures

Farrugia

Gatt

Lonardelli

et al. 2018

Physica Status Solidi (b)

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An extensive investigation is carried out on the missing rib square grid structure using finite element simulations. This showed that, in the cases considered in this study, the type of deformation is primarily dependent on the ratio of the thickness of different ribs with the structure behaving like an anti-tetrachiral at particular ratios. The analysis also showed that the ability of the structure to deform predominantly through the bending of the ligament allows it to achieve much more negative values of the Poisson's ratio than previously reported. Confirmation of the numerical results is obtained through experimental methods involving the 3D printing of representative structures which are subsequently subjected to compression.

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Section: Introductionmentioning

confidence: 99%

Different Deformation Mechanisms Leading to Auxetic Behavior Exhibited by Missing Rib Square Grid Structures

Farrugia

Gatt

Lonardelli

et al. 2018

Physica Status Solidi (b)

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“…Auxetics can be also developed by applying patterns of cuts and holes (Grima et al, 2005). Perforated auxetic composite plates have been used in a hybrid flexible cushioning support for multiple sclerosis patients (Mohanraj et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Dome-Shape Auxetic Cellular Metamaterials: Manufacturing, Modeling, and Testing

et al. 2019

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We present in this work the manufacturing, modeling, and testing of dome-shaped cellular structures with auxetic (negative Poisson's ratio) behavior. The auxetic configurations allow the creation of structures with synclastic (i.e., dome-shaped) curvatures, and this feature is used to evaluate the performance of cellular metamaterials under quasi-static indentation conditions. We consider here different cellular geometries (re-entrant, arrow-head, tri-chiral, hexagonal) and the implications of their manufacturing using 3D printing techniques with PLA material. The dome-shaped configurations are modeled using full-scale non-linear quasi-static and explicit dynamic FE models that represent both the geometry and approximate constitutive models of the PLA filament material derived from tensile tests on dogbone specimens. The cellular metamaterials samples are subjected to indentation tests, with maps of strains obtained through DIC measurements. The correlation between experimental and numerical simulations is good, and shows the peculiar indentation behavior of these cellular structures. We also perform a comparative analysis by simulation of the force/displacement, strain and fracture history during quasi-static loading, and discuss the performance of the different cellular topologies for these dome-shape metamaterial designs.

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“…Mechanisms which lead to auxetic behavior include the ones involving re‐entrancy, hard spheres, and rotating rigid units . A broad spectrum of applications has been predicted for auxetic materials, ranging from the biomedical industry to aviation …”

Section: Introductionmentioning

confidence: 99%

On the Use of Auxetics in Footwear: Investigating the Effect of Padding and Padding Material on Forefoot Pressure in High Heels

Mercieca

Formosa

Grima

et al. 2017

Physica Status Solidi (b)

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Although high heels are known to affect the biomechanics of human movement, most notably by increasing forefoot plantar pressure, it is commonly worn due to the influence of fashion. To deal with the resulting clinical issues, some prescriptions include the use of cushioning pads to redistribute the plantar loads and increase comfort. This preliminary study has sought to investigate whether auxetic foam would be a good candidate for the redistribution of plantar loafing in the forefoot when compared to a more traditional material. From the results obtained, it was shown that auxetic foam demonstrated a decrease in forefoot peak plantar pressure while a commercial product, a material traditionally used for plantar cover paddings, increased pressure in the region of the second–fourth Metatarsophalangeal Joint. This demonstrates the potential for auxetic materials to become the material of choice for such applications, especially since it can be further remodeled until its properties can produce a significant forefoot pressure reduction.

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Hybrid auxetic foam and perforated plate composites for human body support

Cited by 23 publications

References 40 publications

Different Deformation Mechanisms Leading to Auxetic Behavior Exhibited by Missing Rib Square Grid Structures

Different Deformation Mechanisms Leading to Auxetic Behavior Exhibited by Missing Rib Square Grid Structures

Dome-Shape Auxetic Cellular Metamaterials: Manufacturing, Modeling, and Testing

On the Use of Auxetics in Footwear: Investigating the Effect of Padding and Padding Material on Forefoot Pressure in High Heels

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