Biaxially stretched nematic liquid crystalline elastomers

Eur Phys J E Soft Matter. 2012 Jan;35(1):2. doi: 10.1140/epje/i2012-12002-5. Epub 2012 Jan 18.

Abstract

The biaxial stretching of sheets of liquid crystalline neo-Hookean elastomer has been studied in the isotropic case. The results suggest two types of laminate structures in the process of quasiconvexification of the free energy, a fact that implies the appearance of several shear terms in the deformation gradient matrix. More that one decomposition of the deformation gradient is possible, which is consistent with a bifurcation in the undeformed configuration (λ = 1) . This situation is similar to the well-known Rivlin's problem of the triaxial symmetric traction of a neo-Hookean cube. The problem can easily be generalized for an anisotropic material by introducing a semisoft term in the free-energy expression. In this case, the horizontal plateau corresponding to the minimal energy, characteristic of the soft elasticity, disappears, and only an equilibrium condition is obtained.

MeSH terms

  • Algorithms*
  • Anisotropy
  • Elasticity
  • Elastomers / chemistry*
  • Liquid Crystals / chemistry*
  • Models, Chemical*
  • Shear Strength
  • Stress, Mechanical

Substances

  • Elastomers