Nonlinear Processes in Geophysics
Nonlinear Processes in Geophysics
NPG
Articles | Volume 24, issue 3
Articles | Volume 24, issue 3
https://doi.org/10.5194/npg-24-543-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Special issue:
https://doi.org/10.5194/npg-24-543-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 24, issue 3
Research article
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05 Sep 2017
Research article | Highlight paper |  | 05 Sep 2017

Extracting real-crack properties from non-linear elastic behaviour of rocks: abundance of cracks with dominating normal compliance and rocks with negative Poisson ratios

Vladimir Y. Zaitsev, Andrey V. Radostin, Elena Pasternak, and Arcady Dyskin

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Short summary
A new method of analysing pressure wave dependences is presented and tested against the published experimental data. Upon the results of examination of more than 90 rock samples, it was found that a significant portion of rocks (~ 45 %) exhibit negative Poisson ratios at lower pressures. Such a significant number of naturally auxetic rocks suggests that the occurrence of negative Poisson ratios is not as exotic as assumed previously.
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Waves in media with pre-existing or emerging inhomogeneities...