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. 2017 Oct 31;7:14391. doi: 10.1038/s41598-017-14220-3

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Stress-strain data for polyurethane foam samples undergoing mechanical testing under different modes of deformation. (a) Stress-strain data from uniaxial compression tests at different strain rates. The sample undergoes compression up to 80% of its original volume. (b) Cyclic test results in uniaxial compression. (c) Test results from simple shear testing. (d) Uniaxial tension test results. (e,f) Stress relaxation test results showing the decay of strain and stress vs. time, respectively.