Auxetics are materials that become thicker perpendicularly to the applied force when stretched. They have a negative Poisson's ratio, that is, they get thicker and not thinner when stretched. Materials of this sort are expected to have interesting mechanical properties such as high energy absorption and fracture resistance which may be useful in applications such as packing material, knee and elbow pads, robust shock absorbing material, and sponge mops. Look up substance in Wiktionary, the free dictionary. ... Figure 1: Rectangular specimen subject to compression, with Poissons ratio circa 0. ... A property is an intrinsic or extrinsic quality of an object—where an object may be of any differing nature, depending on the context and field — be it computing, philosophy, etc. ... For fractures in geologic formations, see Rock fracture. ...

Auxetic hexagon

The term auxetic is derived from the Greek word αυξητικός (auxetikos) which means, that which tends to increase and has its root in the word αύξησις (auxesis), meaning increase . Auxetic materials can be single molecules, or a particular structure of macroscopic matter. In chemistry, a molecule is an aggregate of two or more atoms in a definite arrangement held together by chemical bonds [1] [2] [3] [4] [5]. Chemical substances are not infinitely divisible into smaller fractions of the same substance: a molecule is generally considered the smallest particle of a pure...

Auxetic materials are quite new. The earliest published example was in Science in 1987, "Foam structures with a negative Poisson's ratio" by R.S. Lakes of University of Iowa. The use of the word Auxetic to refer to this property was probably begun in 1991. 1987 (MCMLXXXVII) was a common year starting on Thursday of the Gregorian calendar. ... The University of Iowa, or Iowa for short, is a major national research university located on a 1,900-acre campus in Iowa City, Iowa, USA, on the Iowa River in East Central Iowa. ...

Auxetics is also the name of a technology company based in Sheffield, England [1]. For other uses, see Sheffield (disambiguation). ... Motto: (French for God and my right) Anthem: God Save the King/Queen Capital London (de facto) Largest city London Official language(s) English (de facto) Unification    - by Athelstan AD 927  Area    - Total 130,395 km² (1st in UK)   50,346 sq mi  Population    - 2006 est. ...

External links

• Auxetic Materials - Applications
• Auxetic
• Materials with negative Poisson's ratio
• Auxetic Materials - What are they?
• UK Auxetic Materials network
• Movie of Auxetic Materials(.mov format)