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Abstract The Poynting effect is a paragon of nonlinear soft matter mechanics. It is the tendency (found in all incompressible, isotropic, hyperelastic solids) exhibited by a soft block to expand vertically when sheared horizontally. It can be observed whenever the length of the cuboid is at least four times its thickness. Here we show that the Poynting effect can be easily reversed and the cuboid can shrink vertically, simply by reducing this aspect ratio.
Research article: Oblique wrinkles M. Carfagna, M. Destrade, A. L. Gower, A. Grillo Phil. Trans. R. Soc. A 2017 375 20160158; DOI: 10.1098/rsta.2016.0158. Published 3 April 2017
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