Determination of Rivlin parameters for carbon black filled NR using laser speckle extensometer

This paper deals with the determination of the parameters of the constituti ve law of a NR filled carbon black aggregates. The experimental technique i nvolves an optical laser speckle extensometer. Digitalized images are recor ded at successive states of deformation. The whole bidimensional field of i nplane displacements is obtained by cross-correlations. Experimental data f rom tensile tests, pure shear tests and double-edge notched samples are pre sented. The experimental results have been compared with numerical simulati ons from the Rivlin constitutive equation into a finite element code.