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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 3
Nonlin. Processes Geophys., 24, 543-551, 2017
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: Waves in media with pre-existing or emerging inhomogeneities...

Nonlin. Processes Geophys., 24, 543-551, 2017
https://doi.org/10.5194/npg-24-543-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 05 Sep 2017

Research article | 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 et al.
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Cited articles  
Belyaeva, I. Yu. and Zaitsev, V. Yu.: Nonlinear Elastic Properties of Microinhomogeneous Hierarchically Structured Media, Acoust. Phys., 43, 510–515, 1997.
Belyaeva, I. Yu. and Zaitsev, V. Yu.: The limiting value of the parameter of elastic nonlinearity in structurally inhomogeneous media, Acoust. Phys., 44, 635–640, 1998.
Coyner, K. B.: Effects of stress, pore pressure, and pore fluids on bulk strain, velocity, and permeability in rocks, PhD thesis, Massachusetts Institute of Technology, 1984.
Fillinger, L., Zaitsev, V. Y., and Gusev, V.: Nonlinear Relaxational Absorption/Transparency for Acoustic Waves Due to Thermoelastic Effect, Acta Acust. United Ac., 92, 24–34, 2006.
Freund, D.: Ultrasonic compressional and shear velocities in dry clastic rocks as a function of porosity, clay content, and confining pressure, Geophys. J. Int., 108, 125–135, https://doi.org/10.1111/j.1365-246X.1992.tb00843.x, 1992.
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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.
A new method of analysing pressure wave dependences is presented and tested against the...
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