Thermoauxetic Behavior of Composite Structures

Jopek, Hubert; Stręk, Tomasz

doi:10.3390/ma11020294

Cited by 44 publications

(21 citation statements)

References 48 publications

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“…More recently, FEM has been extended to a two-phase core employing conventional and/or auxetic phases for out-of-plane auxetic behaviour [141], and to sandwich panel composites with the two-phase core employing established auxetic cellular structures and/or auxetic matrix [145][146][147], as well as structures developed using topology optimisation routines [145,148]. The ability to have temperature-dependent auxetic behaviour in such systems has also been investigated using FEM by allowing one or both phases to possess temperature varying Young's modulus [149,150].…”

Section: Modelling Auxetic Materials and Structuresmentioning

confidence: 99%

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

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

226

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: Modelling Auxetic Materials and Structuresmentioning

confidence: 99%

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

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

226

151

View full text Add to dashboard Cite

show abstract

“…Strek and co‐authors used a structural optimization technique to generate an auxetic core of sandwich structure with minimal internal strain energy. Apart from uniaxial tension and compression also torsion of composite auxetics was analyzed by Strek, Jopek et al Most recent work focuses on advanced thermomechanical properties of auxetic composites …”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of the Mechanical Impedance of the Sandwich Beam with Auxetic Metal Foam Core

Stręk

Michalski

Jopek

2018

Physica Status Solidi (b)

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In this paper, the dynamic behavior of a three-layered sandwich beam with a metal foam core is investigated. Outer layers of the sandwich beam are made of AlSi12 alloy and the core is metal porous foam made of AlSi12. Numerical analysis is made for different parameters of the coreaverage damping loss factor, densities, Young modulus, and Poisson's ratio of core foam. The simulations are used to determine the mechanical impedance for a sandwich beam with the applied harmonic load. Numerical calculations are made with the use of finite element method. The results imply that the auxetic core of the composite beam can have a great impact on the dynamic behavior (mobility) of the system. Furthermore, it appears that there are ranges of frequencies in which the mobility of the system can be minimized by using the auxetic foam core.

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“…[53,54] While auxeticity has often been explained in the form of omnidirectional expansion or contraction of microstructures, thereby leading to opening and closing of voids, there are examples of other classes of materials having no voids within their internal structure and yet exhibiting auxetic behavior. Examples of these are the twophase composites or structures that have been presented by some authors, [52,[55][56][57][58][59] thermoauxetic composites studied in previous studies [60][61][62] , as well as the auxeticity studies of 2D crystals of hard cyclic tetramers [63] and face-centered cubic crystals of hard-core repulsive Yukawa particles. [64] Due to the negative value of Poisson's ratio, auxetic materials exhibit unique properties in comparison with nonauxetics such as enhanced shear modulus, indentation resistance, and fracture toughness, which were presented by Liu and Hu.…”

Section: Introductionmentioning

confidence: 99%

Maximum Stresses in Rectangular Auxetic Membranes

Lim

2020

Physica Status Solidi (b)

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Auxetic materials exhibit a negative Poisson's ratio. Herein, the performance of rectangular auxetic membranes, under uniform load, is evaluated in terms of the maximum stress encountered. To facilitate convenient calculation, empirical modeling is conducted on the exact solution to reproduce displacement coefficients that are sufficiently accurate. A dimensionless maximum stress is then introduced to allow the effect from the membrane's Poisson's ratio and aspect ratio to be directly observed. Results reveal that 1) the dimensionless maximum stress reduces monotonically and nonmonotonically for conventional and auxetic membranes, respectively, 2) for the same Poisson's ratio magnitude the stresses in auxetic membranes are lower than those from conventional ones, 3) the optimal Poisson's ratio, on the basis of dimensionless maximum stress minimization, falls within the negative range, and 4) the dimensionless maximum stress minimization is especially effective for square membranes as well as very long and narrow membranes. It is therefore recommended that material auxeticity be taken into account-alongside geometrical and other material properties-in designing membranes and highly compliant very thin plates.

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Thermoauxetic Behavior of Composite Structures

Cited by 44 publications

References 48 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

Computational Analysis of the Mechanical Impedance of the Sandwich Beam with Auxetic Metal Foam Core

Maximum Stresses in Rectangular Auxetic Membranes

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