Soviet Mining Science 4, 235–238 (1968). Related to Geologic Time, Mineralogy So far, a variety of auxetic materials (e.g., regular honeycombs, polymeric foams, polypropylene fibers, and spring‐hinge structure) have been fabricated for industrial applications (Greaves et al., 2011; Lakes & Witt, 2000; Liu & Hu, 2010). (2005), Ji et al. Figure 15b shows typical examples of the variation of Poisson's ratio with pressure for samples with low porosities (1.5% for sample F17, 1.1% for sample F126, and 1.0% for sample F172) and high clay contents (58% for sample F17, 87%% for sample F126, and 81.0% for sample F172). Both under simple and hydrostatic compression, the dynamic Poisson ratio has a high value which agrees with the results of static tests at very high pressures. Natural rocks, if having negative Poisson's ratios, may overcome some of the above shortcomings and also be helpful in understanding fundamental principles in condensed matter physics (e.g., Alderson & Alderson, 2007; Pasternak & Dyskin, 2012; Prawoto, 2012) and geosciences. The study samples are siltstones from the middle division which is composed predominantly of thick‐bedded siltstone. v = Poisson’s Ratio Alpha‐cristobalite is the only known oxide to have exclusively negative Poisson's ratio for a wide range of temperature from 20 to 1,500°C. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username. Compared to other basic mechanical properties of rocks, Poisson's ratio is an elastic constant of which the significance is generally underrated. As the siltstone samples have not been plastically deformed and do not develop strong quartz CPO, the observed negative Poisson's ratios should not be due to deformation‐induced anisotropy. Hence, the negative Poisson's ratio should be induced by microcracks and micropores filled with alternation materials such as sericite and clay. This finding may provide a new explanation for formation of dome‐and‐basin structures in quartz‐rich sedimentary rocks in response to a horizontal compressional stress in the upper crust. Auxetic behavior occurs when G > 3 K/2. 0.75 1. Poisson's ratio is the ratio of transverse strain to corresponding axial strain on a material stressed along one axis. Poisson's ratio‐density plots for the most common rock‐forming minerals. On microboudin paleopiezometers and their applications to constrain stress variations in tectonites. The solid elements were analyzed for seven categories (i.e., alkali metal, alkaline earth, transition metal, basic metal, semimetal, lanthanide, and actinide). Copyright © 2006 Elsevier Ltd. All rights reserved. One area in which Poisson's effect has a considerable influence is in pressurized pipe flow. We have provided a comprehensive review of the Poisson's ratio characteristics of natural elements, common oxides, silicate minerals, and igneous, metamorphic, and sedimentary rocks. These figures reveal that monomineralic rocks have very high (LT serpentinite, limestone, and anorthosite) or extremely low (quartzite and sandstone) υ values. Furthermore, the synthetic materials with honeycomb structures (Evans & Alderson, 2000; Lakes & Witt, 2000) are highly anisotropic in mechanical properties with auxetic behavior occurring only in certain directions. The α‐β quartz transition temperature is 573°C at room pressure and increases linearly with increasing confining pressure (Shen, Bassett, & Chou, 1993). (2013), Ji, Shao, et al. The maximum density and, (a–c) Seismic wave velocities and (d) Poisson's ratio as a function of confining pressure, measured for siltstone samples J3 (Figure, By continuing to browse this site, you agree to its use of cookies as described in our, Journal of Advances The data are listed in Table, Poisson's ratio‐density plots for 153 oxides.
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