Analysis of the transversely isotropy, due to the production process, of carbon black filled SBR

Through tensile tests of uniaxial and planar type, was proceeded to the mechanical characterization of SBR rubber sheets filled with particles of carbon black. The analysis has allowed defining the elastic features, the storage modulus, the transversal contraction coefficient (both obtained from uniaxial testing) and the shear modulus (from the planar/pure shear tests). Due to the calendering process by which was obtained, the elastomer sheet it’s shown transversely isotropic, with different mechanical behavior in the direction of processing with respect to the transverse direction. Therefore, it was essential to evaluate two different values for each storage modulus, depending that the sample was loaded in the direction of calendering or in that orthogonal to it.