Rheological model of uncured silica-filled tire compounds: application to a simple shear Start-up flow

摘要

A constitutive equation that describes the rheological behavior of highly filled uncured tire compounds was developed and applied to the special case of a low shear rate start-up flow. Start-up flow rheology is related to processability. This model is consistent with the interpretation, that the peak stress in a start-up flow experiment (Mooney peak) performed at low strain rates may be descried as a yield stress. As the system is stretched, more and more structural members rupture according to their respective ultimate strains described by a Weibull distribution function. Moreover, the model describes that effects of storage time on start-up flow rheology through a kinetic analysis and relates the changes in rheology to the formation of bound rubber during storage.