A highly stretchable, resistive strain sensor composed of a bi-sheath structure is described by Jianning Ding, Linqi Shi, Zunfeng Liu, and co-workers in article number 1702134. Buckles of a carbon nanotube sheath contact with one another under compression of an underlying buckled elastomer sheath, which is co-axially coated on a rubber fiber. Stretching separates the buckles, resulting in linear increase of resistance with strain.
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Wang et al. (2017) studied this question.
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