Composite Laminates with Negative Through-the-Thickness Poisson's Ratios

Herakovich, Carl T.

doi:10.1177/002199838401800504

Cited by 189 publications

(125 citation statements)

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“…having high strength-and stiffness-to-weight ratios are currently used. A number of theoretical treatments referred to the possibility of producing auxetic behavior in unidirectional and symmetric (angle-ply) fiber-reinforced composite laminates, [67,68] as a result of factors such as fiber volume fraction, anisotropy, and orientation. Subsequently, Evans' group and the group of Ian Ward at the University of Leeds succeeded in fabricating carbon-fiber-reinforced epoxy composite laminate panels with in-plane [69,70] and through- [69,70] for auxetic laminate composites.…”

Section: Compositesmentioning

confidence: 99%

Auxetic Materials: Functional Materials and Structures from Lateral Thinking!

2000

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Materials that become thicker when stretched and thinner when compressed are the subject of this review. The theory behind the counterintuitive behavior of these so‐called auxetic materials is discussed, and examples and applications are examined. For example, blood vessels made from an auxetic material will tend to increase in wall thickness (rather than decrease) in response to a pulse of blood, thus preventing rupture of the vessel (see Figure).

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Section: Compositesmentioning

confidence: 99%

Auxetic Materials: Functional Materials and Structures from Lateral Thinking!

2000

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“…After the successful fabrication of auxetic foams, research further extended to the investigation of the auxetic effect in more dense materials such as polyethylenes (12,13,34,36,81,(111)(112)(113)(114)(115)(116)(117)(118)(119)(120)(121)(122)(123)(124)(125)(126)(127)(128) based on the internal microstructure of nodules and fibrils. A bead-spring model of polymer networks and flexural grid models of micropolar continua, an array of regular or irregularly shaped particles, a set of springs to store elastic energy, and a set of topological constraints had been discussed in the literature (12,127,128).…”

Section: Auxetic Polyethylenementioning

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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“…Materials having auxetic characteristics include special subsets of foams [2], long fiber composites [3], microporous polymers [1], as well as honeycombs [4]. In honeycombs, the negative Poisson's ratio behavior implies a stiffening geometric effect, which leads to increased in-plane indentation resistance, shear modulus and compressive strength [4,5]. The auxetic behavior also leads to a synclastic curvature feature, which is extremely useful in manufacturing curved sandwich shells [6].…”

Section: Introductionmentioning

confidence: 99%

Global and local linear buckling behavior of a chiral cellular structure

Spadoni

Ruzzene²,

Scarpa

2005

Physica Status Solidi (b)

119

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This paper investigates the flat-wise compression behavior of an innovative cellular structure configuration. The considered layout has a hexagonal chiral geometry featuring cylinders, or nodes, joined by ligaments, or ribs. The resulting assembly is characterized by a number of interesting properties that can be exploited for the design of alternative honeycombs or cellular topologies to be used in sandwich construction. The flat-wise strength of the chiral geometry is investigated through classical analytical formulas for the linear buckling of thin plates and shells and a bifurcation analysis performed on a Finite Element model. The analytical expressions predict the global buckling behavior and the resulting critical loads, and can be directly compared with the results obtained from the Finite Element analysis. In addition, the Finite Element model also predicts local buckling modes, which should be considered to evaluate the possible development of localized plasticity. A sensitivity study is performed to evaluate the influence of the geometry of the chiral structure on its buckling strength. The study shows that the considered topology can offer great design flexibility, whereby several parameters can be selected and modified to improve the flat-wise performance. The comparison with traditional, hexagonal centro-symmetric structural configurations concludes the paper and demonstrates the enhanced performance and the potentials of chiral noncentrosymmetric designs.2

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Composite Laminates with Negative Through-the-Thickness Poisson's Ratios

Cited by 189 publications

References 1 publication

Auxetic Materials: Functional Materials and Structures from Lateral Thinking!

Auxetic Materials: Functional Materials and Structures from Lateral Thinking!

Three decades of auxetic polymers: a review

Global and local linear buckling behavior of a chiral cellular structure

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