A planar texture of a cholesteric liquid crystal is submitted to a uniaxial steplike strain parallel to the helical axis. Using a time-resolved optical Bragg-scattering technique, we measure the average pitch of the texture (and its dispersion) versus time. We observe a nonuniform hydroelastic dilation, which relaxes to the uniform-strain equilibrium state through a permeative flow.
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Scaramuzza et al. (1984) studied this question.
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