Print Email Facebook Twitter Normal stresses, contraction, and stiffening in sheared elastic networks Title Normal stresses, contraction, and stiffening in sheared elastic networks Author Baumgarten, K. (TU Delft Engineering Thermodynamics) Tighe, B.P. (TU Delft Engineering Thermodynamics) Date 2018 Abstract When elastic solids are sheared, a nonlinear effect named after Poynting gives rise to normal stresses or changes in volume. We provide a novel relation between the Poynting effect and the microscopic Grüneisen parameter, which quantifies how stretching shifts vibrational modes. By applying this relation to random spring networks, a minimal model for, e.g., biopolymer gels and solid foams, we find that networks contract or develop tension because they vibrate faster when stretched. The amplitude of the Poynting effect is sensitive to the network's linear elastic moduli, which can be tuned via its preparation protocol and connectivity. Finally, we show that the Poynting effect can be used to predict the finite strain scale where the material stiffens under shear. To reference this document use: http://resolver.tudelft.nl/uuid:13a7126a-8052-4174-8f07-a94e17727176 DOI https://doi.org/10.1103/PhysRevLett.120.148004 ISSN 0031-9007 Source Physical Review Letters, 120 (14) Part of collection Institutional Repository Document type journal article Rights © 2018 K. Baumgarten, B.P. Tighe Files PDF PhysRevLett.120.148004.pdf 569.51 KB Close viewer /islandora/object/uuid:13a7126a-8052-4174-8f07-a94e17727176/datastream/OBJ/view