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. 2017 Jun 8;7:3077. doi: 10.1038/s41598-017-03228-4

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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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Twisting test of human hair. (a) The human hair is assembled on the two sample holders of iTRo with gauge length approximate 680 μm. (b) and (c) selectively gives four SEM images of the sample while twisting from 0° to +180° and 0° to −180°, respectively. (d), (e) and (f) illustrate the shape change and area increase of the four cracks with increasing of twisting cycle. (g) gives the slop difference of the two cracks after the sample is twisting to 0° from +180° and −180° respectively, indicating the slow rebound phenomenal of human hair. (h) shows the diameter of human hair (five samples) decreasing gradually with increasing of twisting cycle.