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The model finally unravels what happens when an auxetic material is stretched, says mathematician, chemist, and co-author Joseph Grima.
The model reveals that when the material is stretched, the rectangles called rigid, rotating subunits rotate relative to one another (see animation), lowering the material's density but increasing its thickness.
Elastic yarns are used as "building block fibres" to weave or knit conductive or optical fabric structures and elastomeric polymers exhibit changes in electrical conductivity as the material is stretched.
Flaw tolerance refers to a state in which a pre-existing crack-like flaw does not propagate even as the material is stretched to failure near its theoretical strength.
In two-dimensions, if a material is stretched in the x-direction, it would contract in the y-direction, and its Poisson's ratio would be defined as (nu _{xy}=-epsilon _{y}/epsilon _{x}), where (epsilon ) is the strain in either the x- or y-directions.
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The material was stretched between three massive steel rings — two standing vertically at either end of the hall and the third hovering horizontally in the middle.
For construction, anything goes -- polyethylene, tent awnings, and a strange canvas material were stretched over wooden beams.
For α = 6, the results were qualitatively similar but the stretch ratios were closer to 1. Due to the Poisson effect, the high stretch region was also associated with substantial compression along the third principle axis, however some of the material was stretched along all three axes (Fig. 4).
When most materials are stretched they get longer in one direction and thinner in the other, like a pulled rubber band.
A period of weeks or months following the belt's disappearance, a white spot forms and erupts dark brownish material which is stretched into a new belt by Jupiter's winds.
The materials haven't changed, it's always been pigment rubbed onto cloth that is stretched over wooden sticks.
Related(18)
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