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. 2020 Sep 13;13(18):4064. doi: 10.3390/ma13184064

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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A homogeneous strain field $ε_{11} < 0$ and $ε_{22} = 0$ single element test results: (a) symbolic computation by MATHEMATICA [40], (b) FEM analysis in TNO DIANA [39].