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Journal ArticleDOI

Foam structures with a negative poisson's ratio

Roderic S. Lakes
- 27 Feb 1987 - 
- Vol. 235, Iss: 4792, pp 1038-1040
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TLDR
A novel foam structure is presented, which exhibits a negative Poisson's ratio, and such a material expands laterally when stretched, in contrast to ordinary materials.
Abstract
A novel foam structure is presented, which exhibits a negative Poisson's ratio. Such a material expands laterally when stretched, in contrast to ordinary materials.

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Flexible mechanical metamaterials

TL;DR: In this article, the design principles leading to these properties are identified and discussed, in particular, linear and mechanism-based metamaterials (such as origami-based and kirigami based metammaterials), harnessing instabilities and frustration, and topological and nonlinear metam materials.
Journal ArticleDOI

Biomechanics of cellular solids.

TL;DR: The mechanics of a wide range of natural cellular materials and their role in lightweight natural sandwich structures and natural tubular structures are examined, as well as two examples of engineered biomaterials with a cellular structure, designed to replace or regenerate tissue in the body.
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Design of materials with extreme thermal expansion using a three-phase topology optimization method

TL;DR: In this article, a three-phase topology optimization method was proposed to find the distribution of material phases that optimizes an objective function (e.g. thermoelastic properties) subject to certain constraints, such as elastic symmetry or volume fractions of the constituent phases, within a periodic base cell.
References
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Journal ArticleDOI

The mechanical properties of cellular solids

TL;DR: The mechanical properties (elastic, plastic, creep, and fracture) of cellular solids or foams are related to the properties of the cell wall material and to the cell geometry.
Journal ArticleDOI

Encystation and expression of cyst antigens by Giardia lamblia in vitro

TL;DR: In these studies, encystation of Giardia lamblia in vitro was demonstrated by morphologic, immunologic, and biochemical criteria and will aid in understanding the differentiation of an important protozoan pathogen.
Journal ArticleDOI

The anisotropic behavior of Poisson's ratio, Young's modulus, and shear modulus in hexagonal materials

TL;DR: In this paper, a method of calculating the anisotropy of Poisson's ratio is applied to trigonal and tetragonal crystals in the literature, and the method of calculation is extended to hexagonal crystals.
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