%0 Journal Article
%T Surface instability of soft solids under strain
%+ Laboratoire Charles Coulomb (L2C)
%A Mora, Serge
%A Abkarian, Manouk
%A Tabuteau, H.
%A Pomeau, Y.
%< avec comité de lecture
%Z L2C:11-286
%@ 1744-683X
%J Soft Matter
%I Royal Society of Chemistry
%V 7
%P 10612-10619
%8 2011
%D 2011
%R 10.1039/c1sm06051a
%K ELASTIC HALF-SPACE
%K CREASING INSTABILITY
%K TRANSIENT NETWORKS
%K RUBBER
%K HYDROGELS
%K RHEOLOGY
%K PATTERNS
%K MODEL
%K GELS
%Z Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph]
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X Using a uniaxial deformation setup, we show that the free surface of an homogeneous elastic material is unstable under compression: parallel grooves nucleate orthogonally to the direction of compression when a characteristic stretch ratio a* is reached. We measure experimentally the variation of a* as well as the wavelength of the grooves as a function of the thickness h(0) of the material. All data collapse on single curves when normalizing h(0) by a characteristic length which is the ratio of the surface tension to the shear modulus of the material. This length scale acts as a regularization parameter for the system. We introduce a theoretical model that captures well the features of the instability. The observed nucleation-like process for the grooves development suggests that the instability is subcritical.
%G English
%L hal-00655908
%U https://hal.science/hal-00655908
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021