auxetic


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auxetic

adjective Pertaining to auxesis, see there.
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This article sets out to evaluate the mechanical properties of auxetic UHMWPE produced by compaction, followed by multiple sintering by measuring the flexural properties of the cylinders produced.
For completeness, this section will detail the fabrication processes for the production of auxetic cylindrical rods by the multisintering route.
This article reports the successful production of auxetic PP films using the same method and same powder but with a different die geometry to that employed in the production of auxetic PP fibers.
This is the same powder used in the previous successful production of auxetic PP fibers and cylinders [10, 11].
This is very much more porous and fibrillar, with the fibrils increasing in length to the order of 30 [+ or -] 20 [micro]m and resembles very closely the auxetic extruded material of earlier work [11].
After a single sintering treatment, some auxetic behavior was observed at the plunger end at very small strains, much less than 1%.
Synthetic auxetic materials [1] were first fabricated in 1987, when Lakes produced an open-celled foam that possessed a negative Poisson's ratio, [nu] [2].
Following the identification of the microstructural causal mechanism for auxetic ex-PTFE, further investigations were carried out to ascertain if a similar mechanism could be induced in other high polymers or whether it was a microstructural effect uniquely possible with expanded PTFE.
In recent years, much research into the production of auxetic (i.
Whichever approach is used, it can be seen that as [nu] approaches -1, the material should become more difficult to indent, and this has proved to be the case for the structural form of auxetic UHMWPE, with enhancements at low loads in hardness of up to 3 times seen when auxetic and compression molded UHMWPE of equivalent modulus and density were compared [15].
The first microporous polymer to be identified was a particular form of polytetrafluoroethylene (PTFE), which was found to be auxetic solely because of its complex microstructure.
In 1992, the nodule-fibril microstructure, which leads directly to auxetic behavior, was reproduced in ultra high molecular weight polyethylene (UHMWPE) by means of a novel thermal processing route (7).