Results 181 to 190 of about 5,461,887 (221)
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Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2007
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 ...
A Alderson, K L Alderson
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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 ...
A Alderson, K L Alderson
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physica status solidi (b), 2009
AbstractA general expression for the directionally anisotropic Poisson's ratio (PR) of cubic materials under external pressure is discussed. It is expressed in terms of the elastic moduli ratios, X = G/K, Y = G/W, where K is the bulk modulus and G, W are shear moduli, and where the mechanical stability criteria are taken into account.
A. C. Brańka +2 more
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AbstractA general expression for the directionally anisotropic Poisson's ratio (PR) of cubic materials under external pressure is discussed. It is expressed in terms of the elastic moduli ratios, X = G/K, Y = G/W, where K is the bulk modulus and G, W are shear moduli, and where the mechanical stability criteria are taken into account.
A. C. Brańka +2 more
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Journal of Materials Science, 2004
Although a negative Poisson's ratio (that is, a lateral extension in response to stretching) is not forbidden by thermodynamics, for almost all common materials the Poisson's ratio is positive. In 1987, Lakes first discovered negative Poisson's ratio effect in polyurethane (PU) foam with re-entrant structures, which was named anti-rubber, auxetic, and ...
Wei Yang +4 more
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Although a negative Poisson's ratio (that is, a lateral extension in response to stretching) is not forbidden by thermodynamics, for almost all common materials the Poisson's ratio is positive. In 1987, Lakes first discovered negative Poisson's ratio effect in polyurethane (PU) foam with re-entrant structures, which was named anti-rubber, auxetic, and ...
Wei Yang +4 more
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Auxetic materials: Avoiding the shrink
Nature, 2003Materials that expand laterally when stretched can act as molecular-scale strain amplifiers. This amplification might be exploited in nature and in future technologies.
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Auxetic mechanics of crystalline materials
Mechanics of Solids, 2010In the present paper, we analyze uniaxial deformation of crystals of different systems with negative Poisson’s ratios, known as auxetics. The behavior of auxetic crystals is studied on the basis of extensive knowledge on the experimental values of elastic constants of different crystals, gathered in the well-known Landolt-Bornstein tables.
R. V. Goldstein +2 more
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Auxetic materials in design and architecture
Nature Reviews Materials, 2017Auxetic materials deform in an unusual way when stretched or compressed; they are flexible and adaptable, and, if made from responsive materials, can react to their environment. The opportunities they offer for innovative applications in fashion, design and architecture are just starting to be explored.
Athina Papadopoulou +2 more
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Auxetic Cellular Materials and Structures
Aerospace, 2005Auxetic materials and structures exhibit the very unusual property of becoming wider when stretched and narrower when squashed (i.e. they have a negative ‘Poisson’s ratio’). This property results in many beneficial effects in the characteristics of the system that make auxetics superior to conventional systems in many practical and high tech ...
Joseph N. Grima +4 more
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Damping in auxetic materials and structures.
The Journal of the Acoustical Society of America, 2010Negative Poisson’s ratio (NPR) (otherwise called auxetics) materials and structures feature enhanced energy absorption under cyclic loading both at low- and high-frequency excitations. We show in this paper experimental and simulation results related to open cell PU-PE foams, honeycombs, and composites, all exhibiting a negative Poisson’s ratio value ...
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Micromechanical Models for Auxetic Materials
2014This chapter provides a survey of micromechanical models that seek to predict and explain auxetic behavior, based on re-entrant microstructures, nodule-fibril microstructure, 3D tethered-nodule model, rotating squares , rectangles, triangles and tetrahedrals models, hard cyclic hexamers model, missing rib models , chiral and anti-chiral models ...
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A Phase Transition Model Describing Auxetic Materials
2017In this paper we introduce a newmodel describing the behavior of auxetic materials in terms of a phase-field PDE system. More precisely, the evolution equations are recovered by a generalization of the principle of virtual power in which microscopic motions and forces, responsible for the phase transitions, are included. The momentum balance is written
E Bonetti, M Fabrizio, M Frémond
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