Energy loss mechanisms and heat generation in carbon black filled rubber composite

Abstract

Tires in motion causes hysteresis by the cyclic deformation, its phenomenon can be analyzed by studying the basic properties of rubber viscoelasticity and energy loss mechanism. The purpose of this study is to analyze energy loss using various material properties and to investigate that what extend loss energy will be converted to heat dissipation. We first picked out the compound similar to tire materials and accomplished the research on the nonlinear thermo-viscoelastic material properties under cyclic loadings, in the view of microscopic scale such as filler-rubber interaction, molecular mobilities, etc., as well as in the view of macroscopic scale which deals stress-strain curve based on experimental condition. In the latter case, the effects of vulcanizate properties and carbon black rubber bonding structure as filler-rubber interaction on heat generation were investigated. In addition, modified nonlinear model to perform the thermomechanical analysis was presented and this model could be used to explain the viscoelastic phenomena and to predict the properties in real situations. The process to obtain the energy loss considering how to generate was established and the systematic theory and method was developed. In the basis of these procedures, we perform the thermal analysis on the internal temperature of rubber specimen. By way of procedures described, Internal temperature distributions were compared with experimental values and were tried to find out the cause of a difference between temperatures. Heat buildup procedures about carbon black filled rubber vulcanizates were performed. The compounds were designed to yield vulcanizates with similar crosslink density levels with the Conv. vulcanizate consisting mainly of polysulfidic crosslinks and EV vulcanizate being mostly monosulfidic. The semi-EV vulcanizate was designed to have a crosslink structure midway between the Conv. and the EV cure systems. DCP system is added to compare curing systems. We inves...