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Title: | An alternative explanation for the negative Poisson's ratios in α-cristobalite |
Authors: | Grima, Joseph N. Gatt, Ruben Alderson, Andrew Evans, Kenneth E. |
Keywords: | Cristobalite Materials -- Mechanical properties Deformations (Mechanics) |
Issue Date: | 2006 |
Publisher: | Elsevier |
Citation: | Grima, J. N., Gatt, R., Alderson, A., & Evans, K. E. (2006). An alternative explanation for the negative Poisson's ratios in α-cristobalite. Materials Science and Engineering A, 423, 219-224. |
Abstract: | Materials with a negative Poisson’s ratio (auxetic) exhibit the unusual property of becoming wider when stretched and thinner when compressed. A naturally occurring auxetic material which has attracted a lot of research in recent years is -cristobalite, a silicate for which negative Poisson’s ratios have been experimentally measured. We present the results of force-field based molecular modelling studies which will provide an insight into nano-level deformations that occur when this silicate is subjected to externally applied uniaxial mechanical stresses. These results will suggest that the auxetic behaviour can be explained in terms of a ‘rotation of rigid units’ model and, more specifically we will show that the auxetic behaviour in the (0 1 0) and (1 0 0) planes may be explained in terms of ‘rotating rectangles’ which are the projections of the three-dimensional silicate framework in the (0 1 0) and (1 0 0) planes. |
URI: | https://www.um.edu.mt/library/oar//handle/123456789/18459 |
Appears in Collections: | Scholarly Works - FacSciChe Scholarly Works - FacSciMet |
Files in This Item:
File | Description | Size | Format | |
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An Alternative Explanation for the Negative Poisson's Ratios in Auxetic Foams.pdf Restricted Access | An alternative explanation for the negative Poisson's ratios in α-cristobalite | 512.79 kB | Adobe PDF | View/Open Request a copy |
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