Manufacture and characterization of auxetic foams

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Authors
  1. Underhill, R.S.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
In the thirty years since the first reports of auxetic foams (i.e., foams exhibiting a negative Poisson’s ratio), there have been no significant advances in their production methods. With the ultimate goal of developing new lightweight armour materials, Defence Research and Development Canada (DRDC) had a program to explore the creation and testing of polymeric auxetic materials, including foams. The goals of the work presented here were to establish methodologies reproducibly consistent with the literature, and to assess measurement techniques. Part of this process involved the construction of a novel mold that achieved uniform compression simultaneously in the three axes. Three foams with differing cell sizes (30, 60, and 90 pores per inch (PPI)) were successfully compressed to form auxetic materials. All three exhibited negative Poisson’s ratios at compression factors of 2.0 or greater. The 90 PPI foam yielded the most negative Poisson’s ratio (-0.16), at a compression factor of 3.2.

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Keywords
negative Poisson’s ratio;auxetic;polyurethane foams
Report Number
DRDC-RDDC-2017-R099 — Scientific Report
Date of publication
01 Sep 2017
Number of Pages
31
DSTKIM No
CA045414
CANDIS No
805821
Format(s):
Electronic Document(PDF)

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