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Carbon black (CB) is used to enhance the mechanical properties of nitrile butadiene rubber (NBR) compounds compared with unfilled compounds. Rubber component design has remained a tedious work because of poor material models inadequately representing hyperelastic and viscohyperelastic behaviour. However, an appropriate choice of material constants can enable predicting elastomeric deformation sensibly and thus make well designed rubber products economically. In this paper, the experimental mechanical properties of NBR with different carbon black loading, CB, have been determined through, tension, compression and relaxation tests. Nonlinear mechanical behaviors of rubbers are described by strain energy functions in order to guarantee that the rigid body motions play no role in the constitutive law. The mathematical material models are based on the existence of strain energy density functions, W, to be scalar potential that depend on the component of the right Cauchy-Green deformation tensor or Green’s strain tensor. The experimental data are fitted to these models in order to find the rubber material constants. Viscohyperelasticity behavior is generated by fitting the experimental data provided by the standard quasi-static tests (tensile, compression) to determine the material constants, while the standard relaxation tests are used to obtain the scalar multipliers and relaxation time constants. Study of the material constants based on different strain energy density functions is carried out. A comparison between experimental load/displacement response and FE-analysis of uniaxial compression test at different CB loading is presented.

EVALUATION OF THE MATERIAL CONSTANTS OF NITRILE BUTADEINE RUBBERS (NBR) WITH DIFFERENT CARBON BLACK (CB): FE-SIMULATION AND EXPERIMENTAL