Abstract
The mechanical behavior of filled elastomeric materials (rubber or rubber-like materials) is known to be incompressible, or nearly-incompressible, hyperelastic and time-dependent, or viscoelastic. This complex behavior of rubbery materials needs more understanding, and a good knowledge is required for such behavior in order to attain a constitutive modeling for better design of a rubber component for a specific application. To achieve this objective, theoretical and experimental works are presented in this paper.
Theoretical works are considered for modeling the hyperelastic and viscoelastic behaviors of rubber. The hyperelastic behavior is modeled using Mooney–Rivlin constitutive model. While the time-dependent behavior (viscoelasticity) was modeled by using Prony series. Modeling and parameters identification, for both hyperelastic and viscoelastic behaviors, were performed and compared with ANSYS 14. To do this, different tests were performed on filled rubber in the present work, all tests were performed on filled rubber material with three different kinds of carbon black, N326, N375, and N660 at room temperature.
Tensile stress-stretch curves were generated from the test data at strain rates 10 mm/min. Relaxation stress-time curves were generated from the test data at mean strain (200%) from the effective length of the specimen, at constant strain rate (200 mm/min).
From the work it is found that a two-term Mooney-Riviln adequately describes the hyperelasticity of the material. The numerical results, using ANSYS, exhibit good agreement with experimental data.
