4 years ago

Pre-stretch dependency of the cyclic dissipation in carbon-filled SBR

Pre-stretch dependency of the cyclic dissipation in carbon-filled SBR
This work explores for the first time the inelastic fatigue process in filled rubbers using the internal state variable theory. The theory is used to qualitatively and quantitatively analyze the complex history-dependent cyclic response of filled rubbers, but also to reveal the underlying physical mechanisms. Experimental observations are reported on a styrene-butadiene rubber (SBR) containing different amounts of carbon-black and cyclically loaded under a wide range of pre-stretch levels. The effects of pre-stretch and filler content on the carbon-filled SBR history-dependent cyclic response, characterized by stress-softening and hysteresis along with dissipative heating, are examined. The intrinsic dissipation, regarded as a consequence of two types of rearrangements in the rubber-filler material system, i.e. viscoelastic and damage mechanisms, is quantified and used to propose a plausible explanation of the underlying inelastic fatigue mechanisms consistent with our experimental observations.

Publisher URL: www.sciencedirect.com/science

DOI: S0014305717308674

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