Abstract
Several technologies can be used for measuring strains of soft materials under high rate impact conditions. These technologies include high speed tensile test, split Hopkinson pressure bar test, digital image correlation and high speed X-ray imaging. However, none of these existing technologies can produce a continuous 3D spatial strain distribution in the test specimen. Here we report a novel passive strain sensor based on poly(dimethyl siloxane) (PDMS) elastomer with covalently incorporated spiropyran (SP) mechanophore to measure impact induced strains. We have shown that the incorporation of SP into PDMS at 0.25 wt% level can adequately measure impact strains via color change under a high strain rate of 1500 s−1 within a fraction of a millisecond. Further, the color change is fully reversible and thus can be used repeatedly. This technology has a high potential to be used for quantifying brain strain for traumatic brain injury applications.
Highlights
Strains of soft materials at high rates can be characterized using several technologies including strain gauges and two dimensional digital image correlation (2D-DIC) during high-speed tensile test [1], split Hopkinson pressure bar test [2] and high-speed X-ray with lead tracers pre-embedded into the specimen [3]
As the Results color change of SP relies on the rupture of the spiro C-O bond and the
The color changeconjugated of SP relies MC
Summary
Strains of soft materials at high rates can be characterized using several technologies including strain gauges and two dimensional digital image correlation (2D-DIC) during high-speed tensile test [1], split Hopkinson pressure bar test [2] and high-speed X-ray with lead tracers pre-embedded into the specimen [3]. These existing technologies suffer from a number of limitations when used for high rate testing. None of these existing technologies offers any direct measurements of the three dimensional (3D)
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