MEDIUM STRAIN HYSTERESIS LOSS OF NATURAL-RUBBER AND STYRENE-BUTADIENERUBBER VULCANIZATES - A PREDICTIVE MODEL

A model for hysteresis loss of rubber vulcanizates at medium strain (l ess than 100%) under dynamic condition has been proposed by using Bolt zmann superposition principle, statistical theory of rubber elasticity and phenomenological theory. The theory incorporates both experimenta l and analytical parameters to quantify hysteresis loss. The model wit h no adjustable parameter has been successfully tested using the exper imental results for natural rubber (NR) and styrene-butadiene rubber ( SBR) vulcanizates having variations of loading of carbon black, silica , clay, resin and curatives, at various strain rates, strain levels an d temperatures. The model is virtually indistinguishable from other we ll-known models at low strain. (C) 1998 Elsevier Science Ltd. All righ ts reserved.