Abstract
Recent papers have discussed particular forms of expanded polytetrafluoroethylene (PTFE) and ultra-high molecular weight polyethylene (UHMWPE) that exhibit large negative Poisson's ratios due to their complex microstructures. These consist of an open network of nodules interconnected by fibrils. Two geometric models have been developed to explain the effect in PTFE; one based on nodule translation and the other on nodule rotation. Data are presented for the strain-dependent variation of the Poisson's ratio of UHMWPE under compression and the models are applied. The translation model alone accurately describes the variations in Poisson's ratio as a function of compressive strain.
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Alderson, K.L., Evans, K.E. Strain-dependent behaviour of microporous polyethylene with a negative Poisson's ratio. JOURNAL OF MATERIALS SCIENCE 28, 4092–4098 (1993). https://doi.org/10.1007/BF00351238
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DOI: https://doi.org/10.1007/BF00351238