Abstract
We study the linear and nonlinear viscoelastic properties of two tire tread compounds. We discuss the difference in nonlinear response between the oscillatory tensile and shear modes. We also analyze strain relaxation (creep) data for the same systems. We discuss what type of measurements are most suitable for obtaining the viscoelastic modulus used in rubber friction calculations.
Highlights
Most practical applications of rubber materials involve large deformations, with strain in the range of 0.1–1
Rubber with filler particles is a highly nonlinear material, where the effective elastic modulus typically decreases by a factor of ≈10 with increasing strain from less 10−4 to 1
We measured the linear response of viscoelastic modulus in oscillatory strain with a very small strain amplitude, 0.0004 and a pre-strain 0.0005
Summary
Most practical applications of rubber materials involve large deformations, with strain in the range of 0.1–1. Rubber with filler particles is a highly nonlinear material, where the effective elastic modulus typically decreases by a factor of ≈10 with increasing strain from less 10−4 to 1. During deformation with large enough strain, this network is broken up, resulting in a strong reduction in the effective elastic modulus. This break up of the filler network with an increasing strain amplitude is associated with a large increase in the dissipative response of the rubber compound
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